[RIP-10] Add test cases for TopicStatsTable.java (#832)

common/src/test/java/org/apache/rocketmq/common/admin/TopicStatsTableTest.java

+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.rocketmq.common.admin;
+
+import org.apache.rocketmq.common.message.MessageQueue;
+import org.apache.rocketmq.remoting.protocol.RemotingSerializable;
+import org.junit.Assert;
+import org.junit.Before;
+import org.junit.Test;
+
+import java.util.HashMap;
+import java.util.Map;
+
+
+public class TopicStatsTableTest {
+
+    private volatile TopicStatsTable topicStatsTable;
+
+    private static final String TEST_TOPIC = "test_topic";
+
+    private static final String TEST_BROKER = "test_broker";
+
+    private static final int QUEUE_ID = 1;
+
+    private static final long CURRENT_TIME_MILLIS = System.currentTimeMillis();
+
+    private static final long MAX_OFFSET = CURRENT_TIME_MILLIS + 100;
+
+    private static final long MIN_OFFSET = CURRENT_TIME_MILLIS - 100;
+
+    @Before
+    public void buildTopicStatsTable() {
+        HashMap<MessageQueue, TopicOffset> offsetTableMap = new HashMap<MessageQueue, TopicOffset>();
+
+        MessageQueue messageQueue = new MessageQueue(TEST_TOPIC, TEST_BROKER, QUEUE_ID);
+
+        TopicOffset topicOffset = new TopicOffset();
+        topicOffset.setLastUpdateTimestamp(CURRENT_TIME_MILLIS);
+        topicOffset.setMinOffset(MIN_OFFSET);
+        topicOffset.setMaxOffset(MAX_OFFSET);
+
+        offsetTableMap.put(messageQueue, topicOffset);
+
+        topicStatsTable = new TopicStatsTable();
+        topicStatsTable.setOffsetTable(offsetTableMap);
+    }
+
+    @Test
+    public void testGetOffsetTable() throws Exception {
+        validateTopicStatsTable(topicStatsTable);
+    }
+
+    @Test
+    public void testFromJson() throws Exception {
+        String json = RemotingSerializable.toJson(topicStatsTable, true);
+        TopicStatsTable fromJson = RemotingSerializable.fromJson(json, TopicStatsTable.class);
+
+        validateTopicStatsTable(fromJson);
+    }
+
+    private static void validateTopicStatsTable(TopicStatsTable topicStatsTable) throws Exception {
+        Map.Entry<MessageQueue, TopicOffset> savedTopicStatsTableMap = topicStatsTable.getOffsetTable().entrySet().iterator().next();
+        MessageQueue savedMessageQueue = savedTopicStatsTableMap.getKey();
+        TopicOffset savedTopicOffset = savedTopicStatsTableMap.getValue();
+
+        Assert.assertTrue(savedMessageQueue.getTopic().equals(TEST_TOPIC));
+        Assert.assertTrue(savedMessageQueue.getBrokerName().equals(TEST_BROKER));
+        Assert.assertTrue(savedMessageQueue.getQueueId() == QUEUE_ID);
+
+        Assert.assertTrue(savedTopicOffset.getLastUpdateTimestamp() == CURRENT_TIME_MILLIS);
+        Assert.assertTrue(savedTopicOffset.getMaxOffset() == MAX_OFFSET);
+        Assert.assertTrue(savedTopicOffset.getMinOffset() == MIN_OFFSET);
+    }
+
+}