PoolUpdater can set Schedule Period now

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

@@ -96,6 +96,7 @@ public class HighAvailableDataSource extends WrapperAdapter implements DataSourc
     private DataSourceSelector selector;
     private String dataSourceFile = DEFAULT_DATA_SOURCE_FILE;
     private String propertyPrefix = "";
+    private int poolUpdatePeriodSeconds = PoolUpdater.DEFAULT_PERIOD;
 
     private volatile boolean inited = false;
 
@@ -110,6 +111,8 @@ public class HighAvailableDataSource extends WrapperAdapter implements DataSourc
             if (inited) {
                 return;
             }
+            poolUpdater.setPeriodSeconds(poolUpdatePeriodSeconds);
+            poolUpdater.init();
             if (dataSourceMap == null || dataSourceMap.isEmpty()) {
                 createNodeMap();
             }
@@ -300,12 +303,12 @@ public class HighAvailableDataSource extends WrapperAdapter implements DataSourc
 
     // Getters & Setters
 
-    public PoolUpdater getPoolUpdater() {
-        return poolUpdater;
+    public int getPoolUpdatePeriodSeconds() {
+        return poolUpdatePeriodSeconds;
     }
 
-    public void setPoolUpdater(PoolUpdater poolUpdater) {
-        this.poolUpdater = poolUpdater;
+    public void setPoolUpdatePeriodSeconds(int poolUpdatePeriodSeconds) {
+        this.poolUpdatePeriodSeconds = poolUpdatePeriodSeconds;
     }
 
     public NodeListener getNodeListener() {

src/main/java/com/alibaba/druid/pool/ha/node/PoolUpdater.java

@@ -40,29 +40,17 @@ import java.util.concurrent.locks.ReentrantLock;
  * @author DigitalSonic
  */
 public class PoolUpdater implements Observer {
+    public final static int DEFAULT_PERIOD = 60;
     private final static Log LOG = LogFactory.getLog(PoolUpdater.class);
-
     private Set<String> nodesToDel = new CopyOnWriteArraySet<String>();
     private HighAvailableDataSource highAvailableDataSource;
 
     private Lock lock = new ReentrantLock();
     private ScheduledExecutorService executor;
+    private int periodSeconds = DEFAULT_PERIOD;
+    private boolean inited = false;
 
-    /**
-     * Create a ScheduledExecutorService to remove unused DataSources.
-     */
     public PoolUpdater() {
-        executor = Executors.newScheduledThreadPool(1);
-        executor.scheduleAtFixedRate(new Runnable() {
-            @Override
-            public void run() {
-                try {
-                    removeDataSources();
-                } catch (Exception e) {
-                    LOG.error("Exception occurred while removing DataSources.", e);
-                }
-            }
-        }, 60, 60, TimeUnit.SECONDS);
     }
 
     /**
@@ -73,6 +61,34 @@ public class PoolUpdater implements Observer {
         setHighAvailableDataSource(highAvailableDataSource);
     }
 
+    /**
+     * Create a ScheduledExecutorService to remove unused DataSources.
+     */
+    public void init() {
+        if (inited) {
+            return;
+        }
+        synchronized (this) {
+            if (inited) {
+                return;
+            }
+            if (periodSeconds <= 0) {
+                periodSeconds = DEFAULT_PERIOD;
+            }
+            executor = Executors.newScheduledThreadPool(1);
+            executor.scheduleAtFixedRate(new Runnable() {
+                @Override
+                public void run() {
+                    try {
+                        removeDataSources();
+                    } catch (Exception e) {
+                        LOG.error("Exception occurred while removing DataSources.", e);
+                    }
+                }
+            }, periodSeconds, periodSeconds, TimeUnit.SECONDS);
+        }
+    }
+
     public void destroy() {
         if (executor == null || executor.isShutdown()) {
             return;
@@ -229,4 +245,12 @@ public class PoolUpdater implements Observer {
     public Set<String> getNodesToDel() {
         return nodesToDel;
     }
+
+    public int getPeriodSeconds() {
+        return periodSeconds;
+    }
+
+    public void setPeriodSeconds(int periodSeconds) {
+        this.periodSeconds = periodSeconds;
+    }
 }

src/test/java/com/alibaba/druid/pool/ha/node/PoolUpdaterTest.java

@@ -24,6 +24,7 @@ public class PoolUpdaterTest {
         haDataSource.setDataSourceMap(map);
 
         updater = new PoolUpdater(haDataSource);
+        updater.init();
     }
 
     @After