add new method in DataSource DUBBO-122 Provider的线程池监控支持

dubbo-common/src/main/java/com/alibaba/dubbo/common/store/DataStore.java

@@ -18,12 +18,19 @@ package com.alibaba.dubbo.common.store;
 
 import com.alibaba.dubbo.common.extension.SPI;
 
+import java.util.Map;
+
 /**
  * @author <a href="mailto:gang.lvg@alibaba-inc.com">kimi</a>
  */
 @SPI("simple")
 public interface DataStore {
 
+    /**
+     * return a snapshot value of componentName
+     */
+    Map<String,Object> get(String componentName);
+
     Object get(String componentName, String key);
 
     void put(String componentName, String key, Object value);

dubbo-common/src/main/java/com/alibaba/dubbo/common/store/support/SimpleDataStore.java

@@ -16,6 +16,7 @@
 
 package com.alibaba.dubbo.common.store.support;
 
+import java.util.HashMap;
 import java.util.Map;
 import java.util.concurrent.ConcurrentHashMap;
 import java.util.concurrent.ConcurrentMap;
@@ -32,6 +33,13 @@ public class SimpleDataStore implements DataStore {
     private ConcurrentMap<String, ConcurrentMap<String, Object>> data =
         new ConcurrentHashMap<String, ConcurrentMap<String,Object>>();
 
+    public Map<String, Object> get(String componentName) {
+        ConcurrentMap<String, Object> value = data.get(componentName);
+        if(value == null) return new HashMap<String, Object>();
+
+        return new HashMap<String, Object>(value);
+    }
+
     public Object get(String componentName, String key) {
         if (!data.containsKey(componentName)) {
             return null;