ha support

src/main/java/com/alibaba/druid/pool/DruidDataSource.java

@@ -122,6 +122,11 @@ public class DruidDataSource extends DruidAbstractDataSource implements
 	public void setResetStatEnable(boolean resetStatEnable) {
 		this.resetStatEnable = resetStatEnable;
 	}
+	
+	public void restart() {
+	    this.close();
+	    this.inited = false;
+	}
 
 	public void resetStat() {
 		if (!resetStatEnable) {

src/main/java/com/alibaba/druid/pool/ha/DataSourceHolder.java

@@ -21,7 +21,7 @@ public class DataSourceHolder implements Closeable {
         this.dataSource = dataSource;
     }
 
-    public void resetStat() {
+    public void resetState() {
         connectCount.set(0);
     }
 
@@ -66,4 +66,8 @@ public class DataSourceHolder implements Closeable {
     public void close() {
         dataSource.close();
     }
+    
+    public void restart() {
+        dataSource.resetStat();
+    }
 }

src/main/java/com/alibaba/druid/pool/ha/HADataSource.java

@@ -25,8 +25,8 @@ public class HADataSource extends MultiDataSource implements HADataSourceMBean,
     public void resetStat() {
         super.resetStat();
 
-        master.resetStat();
-        slave.resetStat();
+        master.resetState();
+        slave.resetState();
     }
 
     public long getMasterConnectCount() {

src/main/java/com/alibaba/druid/pool/ha/MultiDataSource.java

@@ -181,6 +181,10 @@ public abstract class MultiDataSource extends DataSourceAdapter implements Multi
     public void handleNotAwailableDatasource(DataSourceHolder dataSourceHolder) {
         dataSourceHolder.setEnable(false);
     }
+    
+    public String[] getDataSourceNames() {
+        return this.dataSources.keySet().toArray(new String[this.dataSources.size()]);
+    }
 
     @Override
     public String getDbType() {
@@ -216,6 +220,16 @@ public abstract class MultiDataSource extends DataSourceAdapter implements Multi
     public long createTransactionId() {
         return transactionIdSeed.incrementAndGet();
     }
+    
+    public boolean restartDataSource(String name) {
+        DataSourceHolder holder = this.getDataSources().get(name);
+        if (holder != null) {
+            holder.restart();
+            return true;
+        }
+        
+        return false;
+    }
 
     class FailureDetectTask implements Runnable {
 

src/main/java/com/alibaba/druid/pool/ha/MultiDataSourceMBean.java

@@ -3,4 +3,8 @@ package com.alibaba.druid.pool.ha;
 
 public interface MultiDataSourceMBean {
     void failureDetect();
+    
+    String[] getDataSourceNames();
+    
+    boolean restartDataSource(String name);
 }