Merge pull request #2132 from taosdata/hotfix/taos-tools

Hotfix/taos tools

src/client/jni/com_taosdata_jdbc_TSDBJNIConnector.h

@@ -142,8 +142,8 @@ JNIEXPORT jlong JNICALL Java_com_taosdata_jdbc_TSDBJNIConnector_subscribeImp
  * Method:    consumeImp
  * Signature: (J)Lcom/taosdata/jdbc/TSDBResultSetRowData;
  */
-JNIEXPORT jobject JNICALL Java_com_taosdata_jdbc_TSDBJNIConnector_consumeImp
-  (JNIEnv *, jobject, jlong, jint);
+JNIEXPORT jlong JNICALL Java_com_taosdata_jdbc_TSDBJNIConnector_consumeImp
+  (JNIEnv *, jobject, jlong);
 
 /*
  * Class:     com_taosdata_jdbc_TSDBJNIConnector

src/client/src/TSDBJNIConnector.c

@@ -551,8 +551,7 @@ JNIEXPORT jint JNICALL Java_com_taosdata_jdbc_TSDBJNIConnector_closeConnectionIm
 }
 
 JNIEXPORT jlong JNICALL Java_com_taosdata_jdbc_TSDBJNIConnector_subscribeImp(JNIEnv *env, jobject jobj, jlong con,
-                                                                             jboolean restart, jstring jtopic,
-                                                                             jstring jsql, jint jinterval) {
+                                                                             jboolean restart, jstring jtopic, jstring jsql, jint jinterval) {
   jlong sub = 0;
   TAOS *taos = (TAOS *)con;
   char *topic = NULL;
@@ -640,49 +639,23 @@ static jobject convert_one_row(JNIEnv *env, TAOS_ROW row, TAOS_FIELD *fields, in
   return rowobj;
 }
 
-JNIEXPORT jobject JNICALL Java_com_taosdata_jdbc_TSDBJNIConnector_consumeImp(JNIEnv *env, jobject jobj, jlong sub,
-                                                                             jint timeout) {
+JNIEXPORT jlong JNICALL Java_com_taosdata_jdbc_TSDBJNIConnector_consumeImp(JNIEnv *env, jobject jobj, jlong sub) {
   jniTrace("jobj:%p, in TSDBJNIConnector_consumeImp, sub:%ld", jobj, sub);
   jniGetGlobalMethod(env);
 
   TAOS_SUB *tsub = (TAOS_SUB *)sub;
-  jobject   rows = (*env)->NewObject(env, g_arrayListClass, g_arrayListConstructFp);
 
   int64_t start = taosGetTimestampMs();
-  int     count = 0;
+  int count = 0;
 
-  while (true) {
-    TAOS_RES *res = taos_consume(tsub);
-    if (res == NULL) {
-      jniError("jobj:%p, tsub:%p, taos_consume returns NULL", jobj, tsub);
-      return NULL;
-    }
-
-    TAOS_FIELD *fields = taos_fetch_fields(res);
-    int         num_fields = taos_num_fields(res);
-    while (true) {
-      TAOS_ROW row = taos_fetch_row(res);
-      if (row == NULL) {
-        break;
-      }
-      jobject rowobj = convert_one_row(env, row, fields, num_fields);
-      (*env)->CallBooleanMethod(env, rows, g_arrayListAddFp, rowobj);
-      count++;
-    }
+  TAOS_RES *res = taos_consume(tsub);
 
-    if (count > 0) {
-      break;
-    }
-    if (timeout == -1) {
-      continue;
-    }
-    if (((int)(taosGetTimestampMs() - start)) >= timeout) {
-      jniTrace("jobj:%p, sub:%ld, timeout", jobj, sub);
-      break;
-    }
+  if (res == NULL) {
+    jniError("jobj:%p, tsub:%p, taos_consume returns NULL", jobj, tsub);
+    return NULL;
   }
 
-  return rows;
+  return res;
 }
 
 JNIEXPORT void JNICALL Java_com_taosdata_jdbc_TSDBJNIConnector_unsubscribeImp(JNIEnv *env, jobject jobj, jlong sub,

src/connector/jdbc/src/main/java/com/taosdata/jdbc/DatabaseMetaDataResultSet.java

@@ -160,6 +160,7 @@ public class DatabaseMetaDataResultSet implements ResultSet {
 
     @Override
     public Timestamp getTimestamp(int columnIndex) throws SQLException {
+        columnIndex--;
         return rowCursor.getTimestamp(columnIndex);
     }
 

src/connector/jdbc/src/main/java/com/taosdata/jdbc/TSDBConnection.java

@@ -84,6 +84,14 @@ public class TSDBConnection implements Connection {
 		}
 	}
 
+	public TSDBSubscribe createSubscribe() throws SQLException {
+		if (!this.connector.isClosed()) {
+			return new TSDBSubscribe(this.connector);
+		} else {
+			throw new SQLException(TSDBConstants.FixErrMsg(TSDBConstants.JNI_CONNECTION_NULL));
+		}
+	}
+
 	public PreparedStatement prepareStatement(String sql) throws SQLException {
 		if (!this.connector.isClosed()) {
 			return new TSDBPreparedStatement(this.connector, sql);

src/connector/jdbc/src/main/java/com/taosdata/jdbc/TSDBJNIConnector.java

@@ -266,31 +266,31 @@ public class TSDBJNIConnector {
     /**
      * Subscribe to a table in TSDB
      */
-    public long subscribe(String host, String user, String password, String database, String table, long time, int period) {
-        return subscribeImp(host, user, password, database, table, time, period);
+    public long subscribe(String topic, String sql, boolean restart, int period) {
+        return subscribeImp(this.taos, restart, topic, sql, period);
     }
 
-    private native long subscribeImp(String host, String user, String password, String database, String table, long time, int period);
+    public native long subscribeImp(long connection, boolean restart, String topic, String sql, int period);
 
     /**
      * Consume a subscribed table
      */
-    public TSDBResultSetRowData consume(long subscription) {
+    public long consume(long subscription) {
         return this.consumeImp(subscription);
     }
 
-    private native TSDBResultSetRowData consumeImp(long subscription);
+    private native long consumeImp(long subscription);
 
     /**
      * Unsubscribe a table
      *
      * @param subscription
      */
-    public void unsubscribe(long subscription) {
-        unsubscribeImp(subscription);
+    public void unsubscribe(long subscription, boolean isKeep) {
+        unsubscribeImp(subscription, isKeep);
     }
 
-    private native void unsubscribeImp(long subscription);
+    private native void unsubscribeImp(long subscription, boolean isKeep);
 
     /**
      * Validate if a <I>create table</I> sql statement is correct without actually creating that table

src/connector/jdbc/src/main/java/com/taosdata/jdbc/TSDBResultSet.java

@@ -51,47 +51,47 @@ public class TSDBResultSet implements ResultSet {
 	private boolean lastWasNull = false;
 	private final int COLUMN_INDEX_START_VALUE = 1;
 
-    public TSDBJNIConnector getJniConnector() {
-        return jniConnector;
-    }
+	public TSDBJNIConnector getJniConnector() {
+		return jniConnector;
+	}
 
-    public void setJniConnector(TSDBJNIConnector jniConnector) {
-        this.jniConnector = jniConnector;
-    }
+	public void setJniConnector(TSDBJNIConnector jniConnector) {
+		this.jniConnector = jniConnector;
+	}
 
-    public long getResultSetPointer() {
-        return resultSetPointer;
-    }
+	public long getResultSetPointer() {
+		return resultSetPointer;
+	}
 
-    public void setResultSetPointer(long resultSetPointer) {
-        this.resultSetPointer = resultSetPointer;
-    }
+	public void setResultSetPointer(long resultSetPointer) {
+		this.resultSetPointer = resultSetPointer;
+	}
 
-    public List<ColumnMetaData> getColumnMetaDataList() {
-        return columnMetaDataList;
-    }
+	public List<ColumnMetaData> getColumnMetaDataList() {
+		return columnMetaDataList;
+	}
 
-    public void setColumnMetaDataList(List<ColumnMetaData> columnMetaDataList) {
-        this.columnMetaDataList = columnMetaDataList;
-    }
+	public void setColumnMetaDataList(List<ColumnMetaData> columnMetaDataList) {
+		this.columnMetaDataList = columnMetaDataList;
+	}
 
-    public TSDBResultSetRowData getRowData() {
-        return rowData;
-    }
+	public TSDBResultSetRowData getRowData() {
+		return rowData;
+	}
 
-    public void setRowData(TSDBResultSetRowData rowData) {
-        this.rowData = rowData;
-    }
+	public void setRowData(TSDBResultSetRowData rowData) {
+		this.rowData = rowData;
+	}
 
-    public boolean isLastWasNull() {
-        return lastWasNull;
-    }
+	public boolean isLastWasNull() {
+		return lastWasNull;
+	}
 
-    public void setLastWasNull(boolean lastWasNull) {
-        this.lastWasNull = lastWasNull;
-    }
+	public void setLastWasNull(boolean lastWasNull) {
+		this.lastWasNull = lastWasNull;
+	}
 
-    public TSDBResultSet() {
+	public TSDBResultSet() {
 	}
 
 	public TSDBResultSet(TSDBJNIConnector connecter, long resultSetPointer) throws SQLException {
@@ -119,7 +119,7 @@ public class TSDBResultSet implements ResultSet {
 
 	public boolean next() throws SQLException {
 		if (rowData != null) {
-            this.rowData.clear();
+			this.rowData.clear();
 		}
 
 		int code = this.jniConnector.fetchRow(this.resultSetPointer, this.rowData);
@@ -154,119 +154,119 @@ public class TSDBResultSet implements ResultSet {
 	public String getString(int columnIndex) throws SQLException {
 		String res = null;
 		int colIndex = getTrueColumnIndex(columnIndex);
-		
-	    this.lastWasNull = this.rowData.wasNull(colIndex);
-        if (!lastWasNull) {
-            res = this.rowData.getString(colIndex, this.columnMetaDataList.get(colIndex).getColType());
-        }
+
+		this.lastWasNull = this.rowData.wasNull(colIndex);
+		if (!lastWasNull) {
+			res = this.rowData.getString(colIndex, this.columnMetaDataList.get(colIndex).getColType());
+		}
 		return res;
 	}
 
 	public boolean getBoolean(int columnIndex) throws SQLException {
-	    boolean res = false;
+		boolean res = false;
 		int colIndex = getTrueColumnIndex(columnIndex);
 
 		this.lastWasNull = this.rowData.wasNull(colIndex);
 		if (!lastWasNull) {
-		    res = this.rowData.getBoolean(colIndex, this.columnMetaDataList.get(colIndex).getColType());
-        }
+			res = this.rowData.getBoolean(colIndex, this.columnMetaDataList.get(colIndex).getColType());
+		}
 		return res;
 	}
 
 	public byte getByte(int columnIndex) throws SQLException {
-	    byte res = 0;
+		byte res = 0;
 		int colIndex = getTrueColumnIndex(columnIndex);
 
 		this.lastWasNull = this.rowData.wasNull(colIndex);
 		if (!lastWasNull) {
-		    res = (byte) this.rowData.getInt(colIndex, this.columnMetaDataList.get(colIndex).getColType());
-        }
+			res = (byte) this.rowData.getInt(colIndex, this.columnMetaDataList.get(colIndex).getColType());
+		}
 		return res;
 	}
 
 	public short getShort(int columnIndex) throws SQLException {
-	    short res = 0;
+		short res = 0;
 		int colIndex = getTrueColumnIndex(columnIndex);
 
 		this.lastWasNull = this.rowData.wasNull(colIndex);
 		if (!lastWasNull) {
-		    res = (short) this.rowData.getInt(colIndex, this.columnMetaDataList.get(colIndex).getColType());
-        }
+			res = (short) this.rowData.getInt(colIndex, this.columnMetaDataList.get(colIndex).getColType());
+		}
 		return res;
 	}
 
 	public int getInt(int columnIndex) throws SQLException {
-	    int res = 0;
+		int res = 0;
 		int colIndex = getTrueColumnIndex(columnIndex);
 
 		this.lastWasNull = this.rowData.wasNull(colIndex);
-        if (!lastWasNull) {
-            res = this.rowData.getInt(colIndex, this.columnMetaDataList.get(colIndex).getColType());
-        }
+		if (!lastWasNull) {
+			res = this.rowData.getInt(colIndex, this.columnMetaDataList.get(colIndex).getColType());
+		}
 		return res;
 	}
 
 	public long getLong(int columnIndex) throws SQLException {
-	    long res = 0l;
+		long res = 0l;
 		int colIndex = getTrueColumnIndex(columnIndex);
 
 		this.lastWasNull = this.rowData.wasNull(colIndex);
-        if (!lastWasNull) {
-            res = this.rowData.getLong(colIndex, this.columnMetaDataList.get(colIndex).getColType());
-        }
+		if (!lastWasNull) {
+			res = this.rowData.getLong(colIndex, this.columnMetaDataList.get(colIndex).getColType());
+		}
 		return res;
 	}
 
 	public float getFloat(int columnIndex) throws SQLException {
-	    float res = 0;
-	    int colIndex = getTrueColumnIndex(columnIndex);
+		float res = 0;
+		int colIndex = getTrueColumnIndex(columnIndex);
 
 		this.lastWasNull = this.rowData.wasNull(colIndex);
-        if (!lastWasNull) {
-            res = this.rowData.getFloat(colIndex, this.columnMetaDataList.get(colIndex).getColType());
-        }
+		if (!lastWasNull) {
+			res = this.rowData.getFloat(colIndex, this.columnMetaDataList.get(colIndex).getColType());
+		}
 		return res;
 	}
 
 	public double getDouble(int columnIndex) throws SQLException {
-	    double res = 0;
+		double res = 0;
 		int colIndex = getTrueColumnIndex(columnIndex);
 
 		this.lastWasNull = this.rowData.wasNull(colIndex);
-        if (!lastWasNull) {
-            res = this.rowData.getDouble(colIndex, this.columnMetaDataList.get(colIndex).getColType());
-        }
+		if (!lastWasNull) {
+			res = this.rowData.getDouble(colIndex, this.columnMetaDataList.get(colIndex).getColType());
+		}
 		return res;
 	}
 
 	/*
 	 * (non-Javadoc)
-	 * 
+	 *
 	 * @see java.sql.ResultSet#getBigDecimal(int, int)
-	 * 
+	 *
 	 * @deprecated Use {@code getBigDecimal(int columnIndex)} or {@code
 	 * getBigDecimal(String columnLabel)}
 	 */
 	@Deprecated
 	public BigDecimal getBigDecimal(int columnIndex, int scale) throws SQLException {
-	    BigDecimal res = null;
+		BigDecimal res = null;
 		int colIndex = getTrueColumnIndex(columnIndex);
 
 		this.lastWasNull = this.rowData.wasNull(colIndex);
-        if (!lastWasNull) {
-            res = new BigDecimal(this.rowData.getLong(colIndex, this.columnMetaDataList.get(colIndex).getColType()));
-        }
+		if (!lastWasNull) {
+			res = new BigDecimal(this.rowData.getLong(colIndex, this.columnMetaDataList.get(colIndex).getColType()));
+		}
 		return res;
 	}
 
 	public byte[] getBytes(int columnIndex) throws SQLException {
-	    byte[] res = null;
+		byte[] res = null;
 		int colIndex = getTrueColumnIndex(columnIndex);
 
 		this.lastWasNull = this.rowData.wasNull(colIndex);
-        if (!lastWasNull) {
-            res = this.rowData.getString(colIndex, this.columnMetaDataList.get(colIndex).getColType()).getBytes();
-        }
+		if (!lastWasNull) {
+			res = this.rowData.getString(colIndex, this.columnMetaDataList.get(colIndex).getColType()).getBytes();
+		}
 		return res;
 	}
 
@@ -281,13 +281,13 @@ public class TSDBResultSet implements ResultSet {
 	}
 
 	public Timestamp getTimestamp(int columnIndex) throws SQLException {
-	    Timestamp res = null;
+		Timestamp res = null;
 		int colIndex = getTrueColumnIndex(columnIndex);
 
 		this.lastWasNull = this.rowData.wasNull(colIndex);
-        if (!lastWasNull) {
-            res = this.rowData.getTimestamp(colIndex);
-        }
+		if (!lastWasNull) {
+			res = this.rowData.getTimestamp(colIndex);
+		}
 		return res;
 	}
 
@@ -297,9 +297,9 @@ public class TSDBResultSet implements ResultSet {
 
 	/*
 	 * (non-Javadoc)
-	 * 
+	 *
 	 * @see java.sql.ResultSet#getUnicodeStream(int)
-	 * 
+	 *
 	 * * @deprecated use <code>getCharacterStream</code> in place of
 	 * <code>getUnicodeStream</code>
 	 */
@@ -409,13 +409,13 @@ public class TSDBResultSet implements ResultSet {
 	}
 
 	public int findColumn(String columnLabel) throws SQLException {
-        Iterator<ColumnMetaData> colMetaDataIt = this.columnMetaDataList.iterator();
-        while (colMetaDataIt.hasNext()) {
-            ColumnMetaData colMetaData = colMetaDataIt.next();
-            if (colMetaData.getColName() != null && colMetaData.getColName().equalsIgnoreCase(columnLabel)) {
-                return colMetaData.getColIndex() + 1;
-            }
-        }
+		Iterator<ColumnMetaData> colMetaDataIt = this.columnMetaDataList.iterator();
+		while (colMetaDataIt.hasNext()) {
+			ColumnMetaData colMetaData = colMetaDataIt.next();
+			if (colMetaData.getColName() != null && colMetaData.getColName().equalsIgnoreCase(columnLabel)) {
+				return colMetaData.getColIndex() + 1;
+			}
+		}
 		throw new SQLException(TSDBConstants.INVALID_VARIABLES);
 	}
 
@@ -882,7 +882,7 @@ public class TSDBResultSet implements ResultSet {
 	}
 
 	public String getNString(int columnIndex) throws SQLException {
-        int colIndex = getTrueColumnIndex(columnIndex);
+		int colIndex = getTrueColumnIndex(columnIndex);
 		return (String) rowData.get(colIndex);
 	}
 
@@ -1017,17 +1017,17 @@ public class TSDBResultSet implements ResultSet {
 	public <T> T getObject(String columnLabel, Class<T> type) throws SQLException {
 		throw new SQLException(TSDBConstants.UNSUPPORT_METHOD_EXCEPTIONZ_MSG);
 	}
-	
+
 	private int getTrueColumnIndex(int columnIndex) throws SQLException {
 		if (columnIndex < this.COLUMN_INDEX_START_VALUE) {
 			throw new SQLException("Column Index out of range, " + columnIndex + " < " + this.COLUMN_INDEX_START_VALUE);
 		}
-		
+
 		int numOfCols = this.columnMetaDataList.size();
 		if (columnIndex > numOfCols) {
 			throw new SQLException("Column Index out of range, " + columnIndex + " > " + numOfCols);
 		}
-		
+
 		return columnIndex - 1;
 	}
 }

src/connector/jdbc/src/main/java/com/taosdata/jdbc/TSDBSubscribe.java

+/***************************************************************************
+ * Copyright (c) 2019 TAOS Data, Inc. <jhtao@taosdata.com>
+ *
+ * This program is free software: you can use, redistribute, and/or modify
+ * it under the terms of the GNU Affero General Public License, version 3
+ * or later ("AGPL"), as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ *****************************************************************************/
+package com.taosdata.jdbc;
+
+import javax.management.OperationsException;
+import java.sql.SQLException;
+import java.util.Map;
+import java.util.TimerTask;
+import java.util.concurrent.*;
+
+public class TSDBSubscribe {
+    private TSDBJNIConnector connecter = null;
+    private static ScheduledExecutorService pool;
+    private static Map<Long, TSDBTimerTask> timerTaskMap = new ConcurrentHashMap<>();
+    private static Map<Long, ScheduledFuture> scheduledMap = new ConcurrentHashMap();
+
+    private static class TimerInstance {
+        private static final ScheduledExecutorService instance = Executors.newScheduledThreadPool(1);
+    }
+
+    public static ScheduledExecutorService getTimerInstance() {
+        return TimerInstance.instance;
+    }
+
+    public TSDBSubscribe(TSDBJNIConnector connecter) throws SQLException {
+        if (null != connecter) {
+            this.connecter = connecter;
+        } else {
+            throw new SQLException(TSDBConstants.FixErrMsg(TSDBConstants.JNI_CONNECTION_NULL));
+        }
+    }
+
+    /**
+     * sync subscribe
+     *
+     * @param topic
+     * @param sql
+     * @param restart
+     * @param period
+     * @throws SQLException
+     */
+    public long subscribe(String topic, String sql, boolean restart, int period) throws SQLException {
+        if (this.connecter.isClosed()) {
+            throw new SQLException(TSDBConstants.FixErrMsg(TSDBConstants.JNI_CONNECTION_NULL));
+        }
+        if (period < 1000) {
+            throw new SQLException(TSDBConstants.WrapErrMsg(TSDBConstants.INVALID_VARIABLES));
+        }
+        return this.connecter.subscribe(topic, sql, restart, period);
+    }
+
+    /**
+     * async subscribe
+     *
+     * @param topic
+     * @param sql
+     * @param restart
+     * @param period
+     * @param callBack
+     * @throws SQLException
+     */
+    public long subscribe(String topic, String sql, boolean restart, int period, TSDBSubscribeCallBack callBack) throws SQLException {
+        if (this.connecter.isClosed()) {
+            throw new SQLException(TSDBConstants.FixErrMsg(TSDBConstants.JNI_CONNECTION_NULL));
+        }
+        final long subscription = this.connecter.subscribe(topic, sql, restart, period);
+        if (null != callBack) {
+            pool = getTimerInstance();
+
+            TSDBTimerTask timerTask = new TSDBTimerTask(subscription, callBack);
+
+            timerTaskMap.put(subscription, timerTask);
+
+            ScheduledFuture scheduledFuture = pool.scheduleAtFixedRate(timerTask, 1, 1000, TimeUnit.MILLISECONDS);
+            scheduledMap.put(subscription, scheduledFuture);
+        }
+        return subscription;
+    }
+
+    public TSDBResultSet consume(long subscription) throws OperationsException, SQLException {
+        if (this.connecter.isClosed()) {
+            throw new SQLException(TSDBConstants.FixErrMsg(TSDBConstants.JNI_CONNECTION_NULL));
+        }
+        if (0 == subscription) {
+            throw new OperationsException("Invalid use of consume");
+        }
+        long resultSetPointer = this.connecter.consume(subscription);
+
+        if (resultSetPointer == TSDBConstants.JNI_CONNECTION_NULL) {
+            throw new SQLException(TSDBConstants.FixErrMsg(TSDBConstants.JNI_CONNECTION_NULL));
+        } else if (resultSetPointer == TSDBConstants.JNI_NULL_POINTER) {
+            return null;
+        } else {
+            return new TSDBResultSet(this.connecter, resultSetPointer);
+        }
+    }
+
+    /**
+     * cancel subscribe
+     *
+     * @param subscription
+     * @param isKeep
+     * @throws SQLException
+     */
+    public void unsubscribe(long subscription, boolean isKeep) throws SQLException {
+        if (this.connecter.isClosed()) {
+            throw new SQLException(TSDBConstants.FixErrMsg(TSDBConstants.JNI_CONNECTION_NULL));
+        }
+
+        if (null != timerTaskMap.get(subscription)) {
+            synchronized (timerTaskMap.get(subscription)) {
+                while (1 == timerTaskMap.get(subscription).getState()) {
+                    try {
+                        Thread.sleep(10);
+                    } catch (Exception e) {
+                        throw new RuntimeException(e);
+                    }
+                }
+                timerTaskMap.get(subscription).setState(2);
+                if (!timerTaskMap.isEmpty() && timerTaskMap.containsKey(subscription)) {
+                    timerTaskMap.get(subscription).cancel();
+                    timerTaskMap.remove(subscription);
+                    scheduledMap.get(subscription).cancel(false);
+                    scheduledMap.remove(subscription);
+                }
+                this.connecter.unsubscribe(subscription, isKeep);
+            }
+        } else {
+            this.connecter.unsubscribe(subscription, isKeep);
+        }
+    }
+
+    class TSDBTimerTask extends TimerTask {
+        private long subscription;
+        private TSDBSubscribeCallBack callBack;
+        // 0: not running 1: running 2: cancel
+        private int state = 0;
+
+        public TSDBTimerTask(long subscription, TSDBSubscribeCallBack callBack) {
+            this.subscription = subscription;
+            this.callBack = callBack;
+        }
+
+        public int getState() {
+            return this.state;
+        }
+
+        public void setState(int state) {
+            this.state = state;
+        }
+
+        @Override
+        public void run() {
+            synchronized (this) {
+                if (2 == state) {
+                    return;
+                }
+
+                state = 1;
+
+                try {
+                    TSDBResultSet resultSet = consume(subscription);
+                    callBack.invoke(resultSet);
+                } catch (Exception e) {
+                    this.cancel();
+                    throw new RuntimeException(e);
+                }
+                state = 0;
+            }
+        }
+    }
+}
+

src/connector/jdbc/src/main/java/com/taosdata/jdbc/TSDBSubscribeCallBack.java

+/***************************************************************************
+ * Copyright (c) 2019 TAOS Data, Inc. <jhtao@taosdata.com>
+ *
+ * This program is free software: you can use, redistribute, and/or modify
+ * it under the terms of the GNU Affero General Public License, version 3
+ * or later ("AGPL"), as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ *****************************************************************************/
+package com.taosdata.jdbc;
+
+public interface TSDBSubscribeCallBack {
+    void invoke(TSDBResultSet resultSet);
+}

src/connector/jdbc/src/test/java/TestAsyncTSDBSubscribe.java

+import com.taosdata.jdbc.*;
+import org.apache.commons.lang3.StringUtils;
+
+import java.sql.Connection;
+import java.sql.DriverManager;
+import java.util.Properties;
+
+public class TestAsyncTSDBSubscribe {
+    public static void main(String[] args) {
+        String usage = "java -cp taos-jdbcdriver-1.0.3_dev-dist.jar com.taosdata.jdbc.TSDBSubscribe -db dbName -topic topicName " +
+                "-tname tableName -h host";
+        if (args.length < 2) {
+            System.err.println(usage);
+            return;
+        }
+
+        String dbName = "";
+        String tName = "";
+        String host = "localhost";
+        String topic = "";
+        for (int i = 0; i < args.length; i++) {
+            if ("-db".equalsIgnoreCase(args[i]) && i < args.length - 1) {
+                dbName = args[++i];
+            }
+            if ("-tname".equalsIgnoreCase(args[i]) && i < args.length - 1) {
+                tName = args[++i];
+            }
+            if ("-h".equalsIgnoreCase(args[i]) && i < args.length - 1) {
+                host = args[++i];
+            }
+            if ("-topic".equalsIgnoreCase(args[i]) && i < args.length - 1) {
+                topic = args[++i];
+            }
+        }
+        if (StringUtils.isEmpty(dbName) || StringUtils.isEmpty(tName) || StringUtils.isEmpty(topic)) {
+            System.err.println(usage);
+            return;
+        }
+
+        Connection connection = null;
+        TSDBSubscribe subscribe = null;
+        long subscribId = 0;
+        try {
+            Class.forName("com.taosdata.jdbc.TSDBDriver");
+            Properties properties = new Properties();
+            properties.setProperty(TSDBDriver.PROPERTY_KEY_HOST, host);
+            connection = DriverManager.getConnection("jdbc:TAOS://" + host + ":0/" + dbName + "?user=root&password=taosdata", properties);
+            String rawSql = "select * from " + tName + ";";
+            subscribe = ((TSDBConnection) connection).createSubscribe();
+            subscribId = subscribe.subscribe(topic, rawSql, false, 1000, new CallBack("first"));
+            long subscribId2 = subscribe.subscribe("test", rawSql, false, 1000, new CallBack("second"));
+            int a = 0;
+            Thread.sleep(2000);
+            subscribe.unsubscribe(subscribId, true);
+            System.err.println("cancel subscribe");
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+    }
+
+    private static class CallBack implements TSDBSubscribeCallBack {
+        private String name = "";
+
+        public CallBack(String name) {
+            this.name = name;
+        }
+
+        @Override
+        public void invoke(TSDBResultSet resultSet) {
+            try {
+                while (null !=resultSet && resultSet.next()) {
+                    System.out.print("callback_" + name + ": ");
+                    for (int i = 1; i <= resultSet.getMetaData().getColumnCount(); i++) {
+                        System.out.printf(i + ": " + resultSet.getString(i) + "\t");
+                    }
+                    System.out.println();
+                }
+            } catch (Exception e) {
+                e.printStackTrace();
+            }
+        }
+    }
+}

src/connector/jdbc/src/test/java/TestPreparedStatement.java

@@ -10,9 +10,9 @@ public class TestPreparedStatement {
         try {
             Class.forName("com.taosdata.jdbc.TSDBDriver");
             Properties properties = new Properties();
-            properties.setProperty(TSDBDriver.PROPERTY_KEY_HOST, "192.168.1.117");
-            Connection connection = DriverManager.getConnection("jdbc:TAOS://192.168.1.117:0/?user=root&password=taosdata", properties);
-            String rawSql = "SELECT ts, c1 FROM (select c1, ts from db.tb1) SUB_QRY";
+            properties.setProperty(TSDBDriver.PROPERTY_KEY_HOST, "localhost");
+            Connection connection = DriverManager.getConnection("jdbc:TAOS://localhost:0/?user=root&password=taosdata", properties);
+            String rawSql = "select * from test.log0601";
 //            String[] params = new String[]{"ts", "c1"};
             PreparedStatement pstmt = (TSDBPreparedStatement) connection.prepareStatement(rawSql);
             ResultSet resSet = pstmt.executeQuery();

src/connector/jdbc/src/test/java/TestTSDBSubscribe.java

+import com.taosdata.jdbc.TSDBConnection;
+import com.taosdata.jdbc.TSDBDriver;
+import com.taosdata.jdbc.TSDBResultSet;
+import com.taosdata.jdbc.TSDBSubscribe;
+import org.apache.commons.lang3.StringUtils;
+
+import java.sql.Connection;
+import java.sql.DriverManager;
+import java.util.Properties;
+
+public class TestTSDBSubscribe {
+    public static void main(String[] args) throws Exception {
+        String usage = "java -cp taos-jdbcdriver-1.0.3_dev-dist.jar com.taosdata.jdbc.TSDBSubscribe -db dbName " +
+                "-topic topicName -tname tableName -h host";
+        if (args.length < 2) {
+            System.err.println(usage);
+            return;
+        }
+
+        String dbName = "";
+        String tName = "";
+        String host = "localhost";
+        String topic = "";
+        for (int i = 0; i < args.length; i++) {
+            if ("-db".equalsIgnoreCase(args[i]) && i < args.length - 1) {
+                dbName = args[++i];
+            }
+            if ("-tname".equalsIgnoreCase(args[i]) && i < args.length - 1) {
+                tName = args[++i];
+            }
+            if ("-h".equalsIgnoreCase(args[i]) && i < args.length - 1) {
+                host = args[++i];
+            }
+            if ("-topic".equalsIgnoreCase(args[i]) && i < args.length - 1) {
+                topic = args[++i];
+            }
+        }
+        if (StringUtils.isEmpty(dbName) || StringUtils.isEmpty(tName) || StringUtils.isEmpty(topic)) {
+            System.err.println(usage);
+            return;
+        }
+
+        Connection connection = null;
+        TSDBSubscribe subscribe = null;
+        long subscribId = 0;
+        try {
+            Class.forName("com.taosdata.jdbc.TSDBDriver");
+            Properties properties = new Properties();
+            properties.setProperty(TSDBDriver.PROPERTY_KEY_HOST, host);
+            connection = DriverManager.getConnection("jdbc:TAOS://" + host + ":0/" + dbName + "?user=root&password=taosdata"
+                    , properties);
+            String rawSql = "select * from " + tName + ";";
+            subscribe = ((TSDBConnection) connection).createSubscribe();
+            subscribId = subscribe.subscribe(topic, rawSql, false, 1000);
+            int a = 0;
+            while (true) {
+                Thread.sleep(900);
+                TSDBResultSet resSet = subscribe.consume(subscribId);
+
+                while (resSet.next()) {
+                    for (int i = 1; i <= resSet.getMetaData().getColumnCount(); i++) {
+                        System.out.printf(i + ": " + resSet.getString(i) + "\t");
+                    }
+                    System.out.println("\n======" + a + "==========");
+                }
+
+                a++;
+                if (a >= 10) {
+                    break;
+                }
+            }
+        } catch (Exception e) {
+            e.printStackTrace();
+        } finally {
+            if (null != subscribe && 0 != subscribId) {
+                subscribe.unsubscribe(subscribId, true);
+            }
+            if (null != connection) {
+                connection.close();
+            }
+        }
+    }
+}

src/kit/taosnetwork/client.c

+/*
+ * Copyright (c) 2019 TAOS Data, Inc. <jhtao@taosdata.com>
+ *
+ * This program is free software: you can use, redistribute, and/or modify
+ * it under the terms of the GNU Affero General Public License, version 3
+ * or later ("AGPL"), as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <arpa/inet.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <netdb.h>
+#include <netinet/in.h>
+#include <pthread.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/socket.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#define BUFFER_SIZE 200
+
+typedef struct {
+  int   port;
+  char *host[15];
+} info;
+
+void *checkPort(void *sarg) {
+  info *pinfo = (info *)sarg;
+  int   port = pinfo->port;
+  char *host = *pinfo->host;
+  int   clientSocket;
+
+  struct sockaddr_in serverAddr;
+  char               sendbuf[BUFFER_SIZE];
+  char               recvbuf[BUFFER_SIZE];
+  int                iDataNum;
+  if ((clientSocket = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
+    perror("socket");
+    return NULL;
+  }
+  serverAddr.sin_family = AF_INET;
+  serverAddr.sin_port = htons(port);
+
+  serverAddr.sin_addr.s_addr = inet_addr(host);
+
+  printf("=================================\n");
+  if (connect(clientSocket, (struct sockaddr *)&serverAddr, sizeof(serverAddr)) < 0) {
+    perror("connect");
+    return NULL;
+  }
+  printf("Connect to: %s:%d...success\n", host, port);
+
+  sprintf(sendbuf, "send port_%d", port);
+  send(clientSocket, sendbuf, strlen(sendbuf), 0);
+  printf("Send msg_%d: %s\n", port, sendbuf);
+
+  recvbuf[0] = '\0';
+  iDataNum = recv(clientSocket, recvbuf, BUFFER_SIZE, 0);
+  recvbuf[iDataNum] = '\0';
+  printf("Read ack msg_%d: %s\n", port, recvbuf);
+
+  printf("=================================\n");
+  close(clientSocket);
+  return NULL;
+}
+
+void *checkUPort(void *sarg) {
+  info *pinfo = (info *)sarg;
+  int   port = pinfo->port;
+  char *host = *pinfo->host;
+  int   clientSocket;
+
+  struct sockaddr_in serverAddr;
+  char               sendbuf[BUFFER_SIZE];
+  char               recvbuf[BUFFER_SIZE];
+  int                iDataNum;
+  if ((clientSocket = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0) {
+    perror("socket");
+    return NULL;
+  }
+  serverAddr.sin_family = AF_INET;
+  serverAddr.sin_port = htons(port);
+
+  serverAddr.sin_addr.s_addr = inet_addr(host);
+
+  printf("=================================\n");
+
+  sprintf(sendbuf, "send msg port_%d by udp", port);
+
+  socklen_t sin_size = sizeof(*(struct sockaddr*)&serverAddr);
+
+  sendto(clientSocket, sendbuf, strlen(sendbuf), 0, (struct sockaddr *)&serverAddr, (int)sin_size);
+
+  printf("Send msg_%d by udp: %s\n", port, sendbuf);
+
+  recvbuf[0] = '\0';
+  iDataNum = recvfrom(clientSocket, recvbuf, BUFFER_SIZE, 0, (struct sockaddr *)&serverAddr, &sin_size);
+  recvbuf[iDataNum] = '\0';
+  printf("Read ack msg_%d from udp: %s\n", port, recvbuf);
+
+  printf("=================================\n");
+  close(clientSocket);
+  return NULL;
+}
+
+int main() {
+  int   port = 6020;
+  char *host = "127.0.0.1";
+  info *tinfo = malloc(sizeof(info));
+  info *uinfo = malloc(sizeof(info));
+
+  for (size_t i = 0; i < 30; i++) {
+    port++;
+    printf("For test: %s:%d\n", host, port);
+
+    *tinfo->host = host;
+    tinfo->port = port;
+    checkPort(tinfo);
+
+    *uinfo->host = host;
+    uinfo->port = port;
+    checkUPort(uinfo);
+  }
+  free(tinfo);
+  free(uinfo);
+}
\ No newline at end of file

src/kit/taosnetwork/server.c

+/*
+ * Copyright (c) 2019 TAOS Data, Inc. <jhtao@taosdata.com>
+ *
+ * This program is free software: you can use, redistribute, and/or modify
+ * it under the terms of the GNU Affero General Public License, version 3
+ * or later ("AGPL"), as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <arpa/inet.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <netdb.h>
+#include <netinet/in.h>
+#include <pthread.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/socket.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#define BUFFER_SIZE 200
+
+typedef struct {
+  int port;
+  int type;  // 0: tcp, 1: udo, default: 0
+} info;
+
+static void *bindPort(void *sarg) {
+  info *pinfo = (info *)sarg;
+  int   port = pinfo->port;
+  int   type = pinfo->type;
+  int   serverSocket;
+
+  struct sockaddr_in server_addr;
+  struct sockaddr_in clientAddr;
+  int                addr_len = sizeof(clientAddr);
+  int                client;
+  char               buffer[BUFFER_SIZE];
+  int                iDataNum;
+
+  if ((serverSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0) {
+    perror("socket");
+    return NULL;
+  }
+
+  bzero(&server_addr, sizeof(server_addr));
+  server_addr.sin_family = AF_INET;
+  server_addr.sin_port = htons(port);
+  server_addr.sin_addr.s_addr = htonl(INADDR_ANY);
+
+  if (bind(serverSocket, (struct sockaddr *)&server_addr, sizeof(server_addr)) < 0) {
+    perror("connect");
+    return NULL;
+  }
+
+  if (listen(serverSocket, 5) < 0) {
+    perror("listen");
+    return NULL;
+  }
+
+  printf("Bind port: %d success\n", port);
+  while (1) {
+    client = accept(serverSocket, (struct sockaddr *)&clientAddr, (socklen_t *)&addr_len);
+    if (client < 0) {
+      perror("accept");
+      continue;
+    }
+    printf("=================================\n");
+
+    printf("Client ip is %s, Server port is %d\n", inet_ntoa(clientAddr.sin_addr), port);
+    while (1) {
+      buffer[0] = '\0';
+      iDataNum = recv(client, buffer, BUFFER_SIZE, 0);
+
+      if (iDataNum < 0) {
+        perror("recv null");
+        continue;
+      }
+      if (iDataNum > 0) {
+        buffer[iDataNum] = '\0';
+        printf("read msg:%s\n", buffer);
+        if (strcmp(buffer, "quit") == 0) break;
+        buffer[0] = '\0';
+
+        sprintf(buffer, "ack port_%d", port);
+        printf("send ack msg:%s\n", buffer);
+
+        send(client, buffer, strlen(buffer), 0);
+        break;
+      }
+    }
+    printf("=================================\n");
+  }
+  close(serverSocket);
+  return NULL;
+}
+
+static void *bindUPort(void *sarg) {
+  info *pinfo = (info *)sarg;
+  int   port = pinfo->port;
+  int   type = pinfo->type;
+  int   serverSocket;
+
+  struct sockaddr_in server_addr;
+  struct sockaddr_in clientAddr;
+  int                addr_len = sizeof(clientAddr);
+  int                client;
+  char               buffer[BUFFER_SIZE];
+  int                iDataNum;
+
+  if ((serverSocket = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0) {
+    perror("socket");
+    return NULL;
+  }
+
+  bzero(&server_addr, sizeof(server_addr));
+  server_addr.sin_family = AF_INET;
+  server_addr.sin_port = htons(port);
+  server_addr.sin_addr.s_addr = htonl(INADDR_ANY);
+
+  if (bind(serverSocket, (struct sockaddr *)&server_addr, sizeof(server_addr)) < 0) {
+    perror("connect");
+    return NULL;
+  }
+
+  socklen_t sin_size;
+  printf("Bind port: %d success\n", port);
+
+  while (1) {
+    buffer[0] = '\0';
+
+    sin_size = sizeof(*(struct sockaddr *)&server_addr);
+
+    iDataNum = recvfrom(serverSocket, buffer, BUFFER_SIZE, 0, (struct sockaddr *)&clientAddr, &sin_size);
+
+    if (iDataNum < 0) {
+      perror("recvfrom null");
+      continue;
+    }
+    if (iDataNum > 0) {
+      printf("=================================\n");
+
+      printf("Client ip is %s, Server port is %d\n", inet_ntoa(clientAddr.sin_addr), port);
+      buffer[iDataNum] = '\0';
+      printf("Read msg from udp:%s\n", buffer);
+      if (strcmp(buffer, "quit") == 0) break;
+      buffer[0] = '\0';
+
+      sprintf(buffer, "ack port_%d by udp", port);
+      printf("Send ack msg by udp:%s\n", buffer);
+
+      sendto(serverSocket, buffer, strlen(buffer), 0, (struct sockaddr *)&clientAddr, (int)sin_size);
+
+      send(client, buffer, strlen(buffer), 0);
+      printf("=================================\n");
+    }
+  }
+
+  close(serverSocket);
+  return NULL;
+}
+
+
+int main() {
+  int        port = 6020;
+  pthread_t *pids = malloc(60 * sizeof(pthread_t));
+  info *     infos = malloc(30 * sizeof(info));
+  info *     uinfos = malloc(30 * sizeof(info));
+
+  for (size_t i = 0; i < 30; i++) {
+    port++;
+
+    info *pinfo = infos++;
+    pinfo->port = port;
+
+    if (pthread_create(pids + i, NULL, bindPort, pinfo) != 0)  //创建线程
+    {                                                          //创建线程失败
+      printf("创建线程失败: %d.\n", port);
+      exit(0);
+    }
+
+    info *uinfo = uinfos++;
+    uinfo->port = port;
+    uinfo->type = 1;
+    if (pthread_create(pids + 30 + i, NULL, bindUPort, uinfo) != 0)  //创建线程
+    {                                                                //创建线程失败
+      printf("创建线程失败: %d.\n", port);
+      exit(0);
+    }
+  }
+  for (int i = 0; i < 30; i++) {
+    pthread_join(pids[i], NULL);
+    pthread_join(pids[(10 + i)], NULL);
+  }
+}

src/kit/taosnetwork/taosnetwork_client.c

+/*
+ * Copyright (c) 2019 TAOS Data, Inc. <jhtao@taosdata.com>
+ *
+ * This program is free software: you can use, redistribute, and/or modify
+ * it under the terms of the GNU Affero General Public License, version 3
+ * or later ("AGPL"), as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <netinet/in.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/socket.h>
+#include <unistd.h>
+#define SERVER_PORT 8000
+#define SIZE 200
+
+int main() {
+  struct sockaddr_in servaddr, cliaddr;
+  socklen_t          cliaddr_len;
+  int                client_sockfd;
+  char               buf[SIZE];
+  char               recvbuf[SIZE];
+
+  int i, n, flag = 0;
+
+  int len, iDataNum;
+
+  client_sockfd = socket(AF_INET, SOCK_STREAM, 0);
+  bzero(&servaddr, sizeof(servaddr));
+  servaddr.sin_family = AF_INET;
+  servaddr.sin_addr.s_addr = htonl(INADDR_ANY);
+  servaddr.sin_port = htons(SERVER_PORT);
+
+  if (connect(client_sockfd, (struct sockaddr *)&servaddr, sizeof(servaddr)) < 0) {
+    printf("Connected error..\n");
+    return 0;
+  }
+  printf("Connected to server..\n");
+
+  /*循环的发送接收信息并打印接收信息（可以按需发送）--recv返回接收到的字节数，send返回发送的字节数*/
+  while (1) {
+    printf("Enter string to send:");
+    scanf("%s", buf);
+    if (!strcmp(buf, "quit")) {
+      break;
+    }
+    len = (sizeof buf);
+
+    recvbuf[0] = '\0';
+
+    iDataNum = recv(client_sockfd, recvbuf, SIZE, 0);
+
+    recvbuf[iDataNum] = '\0';
+
+    printf("%s\n", recvbuf);
+  }
+  return 0;
+}

src/kit/taosnetwork/taosnetwork_server.c

+/*
+ * Copyright (c) 2019 TAOS Data, Inc. <jhtao@taosdata.com>
+ *
+ * This program is free software: you can use, redistribute, and/or modify
+ * it under the terms of the GNU Affero General Public License, version 3
+ * or later ("AGPL"), as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <netinet/in.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/socket.h>
+#include <unistd.h>
+#define SERVER_PORT 8000
+#define SIZE 200
+
+int main() {
+  struct sockaddr_in servaddr, cliaddr;
+  socklen_t          cliaddr_len;
+  int                listenfd, connfd;
+  char               buf[BUFSIZ];
+  int                i, n, flag = 0;
+
+  listenfd = socket(AF_INET, SOCK_STREAM, 0);
+  bzero(&servaddr, sizeof(servaddr));
+  servaddr.sin_family = AF_INET;
+  servaddr.sin_addr.s_addr = htonl(INADDR_ANY);
+  servaddr.sin_port = htons(SERVER_PORT);
+  bind(listenfd, (struct sockaddr *)&servaddr, sizeof(servaddr));
+  listen(listenfd, 20);
+
+  printf("Accepting connections..\n");
+  while (1) {
+    cliaddr_len = sizeof(cliaddr);
+    connfd = accept(listenfd, (struct sockaddr *)&cliaddr,
+                    &cliaddr_len);  //如果得不到客户端发来的消息，将会被阻塞，一直等到消息到来
+    n = read(connfd, buf, SIZE);    //如果n<=0，表示客户端已断开
+    while (1) {
+      if (n != 0) {
+        for (i = 0; i < n; i++) printf("%c", buf[i]);  //输出客户端发来的信息
+      } else {
+        printf("Client say close the connection..\n");
+        break;
+      }
+      n = read(connfd, buf, SIZE);
+    }
+    close(connfd);
+  }
+}

src/kit/taosnetwork/test_client.c

+#include <netinet/in.h>
+#include <stdio.h>
+#include <string.h>
+#include <sys/socket.h>
+#include <sys/types.h>
+
+#define SERVER_PORT 8888
+#define BUFF_LEN 512
+#define SERVER_IP "172.0.5.182"
+
+void udp_msg_sender(int fd, struct sockaddr* dst) {}
+
+/*
+    client:
+            socket-->sendto-->revcfrom-->close
+*/
+
+int main(int argc, char* argv[]) {
+  int                client_fd;
+  struct sockaddr_in ser_addr;
+
+  client_fd = socket(AF_INET, SOCK_DGRAM, 0);
+  if (client_fd < 0) {
+    printf("create socket fail!\n");
+    return -1;
+  }
+
+  memset(&ser_addr, 0, sizeof(ser_addr));
+  ser_addr.sin_family = AF_INET;
+  // ser_addr.sin_addr.s_addr = inet_addr(SERVER_IP);
+  ser_addr.sin_addr.s_addr = htonl(INADDR_ANY);  //注意网络序转换
+  ser_addr.sin_port = htons(SERVER_PORT);        //注意网络序转换
+
+  socklen_t          len;
+  struct sockaddr_in src;
+  while (1) {
+    char buf[BUFF_LEN] = "TEST UDP MSG!\n";
+    len = sizeof(*(struct sockaddr*)&ser_addr);
+    printf("client:%s\n", buf);  //打印自己发送的信息
+    sendto(client_fd, buf, BUFF_LEN, 0, (struct sockaddr*)&ser_addr, len);
+    memset(buf, 0, BUFF_LEN);
+    recvfrom(client_fd, buf, BUFF_LEN, 0, (struct sockaddr*)&src, &len);  //接收来自server的信息
+    printf("server:%s\n", buf);
+    sleep(1);  //一秒发送一次消息
+  }
+
+  close(client_fd);
+
+  return 0;
+}
\ No newline at end of file

src/kit/taosnetwork/test_server.c

+#include <netinet/in.h>
+#include <stdio.h>
+#include <string.h>
+#include <sys/socket.h>
+#include <sys/types.h>
+
+#define SERVER_PORT 8888
+#define BUFF_LEN 1024
+
+void handle_udp_msg(int fd) {
+  char      buf[BUFF_LEN];  //接收缓冲区，1024字节
+  socklen_t len;
+  int       count;
+  struct sockaddr_in clent_addr;  // clent_addr用于记录发送方的地址信息
+  while (1) {
+    memset(buf, 0, BUFF_LEN);
+    len = sizeof(clent_addr);
+    count =
+        recvfrom(fd, buf, BUFF_LEN, 0, (struct sockaddr*)&clent_addr, &len);  // recvfrom是拥塞函数，没有数据就一直拥塞
+    if (count == -1) {
+      printf("recieve data fail!\n");
+      return;
+    }
+    printf("client:%s\n", buf);  //打印client发过来的信息
+    memset(buf, 0, BUFF_LEN);
+    sprintf(buf, "I have recieved %d bytes data!\n", count);  //回复client
+    printf("server:%s\n", buf);                               //打印自己发送的信息给
+    sendto(fd, buf, BUFF_LEN, 0, (struct sockaddr*)&clent_addr,
+           len);  //发送信息给client，注意使用了clent_addr结构体指针
+  }
+}
+
+/*
+    server:
+            socket-->bind-->recvfrom-->sendto-->close
+*/
+
+int main(int argc, char* argv[]) {
+  int                server_fd, ret;
+  struct sockaddr_in ser_addr;
+
+  server_fd = socket(AF_INET, SOCK_DGRAM, 0);  // AF_INET:IPV4;SOCK_DGRAM:UDP
+  if (server_fd < 0) {
+    printf("create socket fail!\n");
+    return -1;
+  }
+
+  memset(&ser_addr, 0, sizeof(ser_addr));
+  ser_addr.sin_family = AF_INET;
+  ser_addr.sin_addr.s_addr = htonl(INADDR_ANY);  // IP地址，需要进行网络序转换，INADDR_ANY：本地地址
+  ser_addr.sin_port = htons(SERVER_PORT);        //端口号，需要网络序转换
+
+  ret = bind(server_fd, (struct sockaddr*)&ser_addr, sizeof(ser_addr));
+  if (ret < 0) {
+    printf("socket bind fail!\n");
+    return -1;
+  }
+
+  handle_udp_msg(server_fd);  //处理接收到的数据
+
+  close(server_fd);
+  return 0;
+}
\ No newline at end of file