[STORM-1971] HDFS Timed Synchronous Policy

external/storm-hdfs/src/main/java/org/apache/storm/hdfs/bolt/sync/TimedSyncPolicy.java

@@ -0,0 +1,48 @@
+/**
+ * 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.storm.hdfs.bolt.sync;
+
+import org.apache.storm.tuple.Tuple;
+
+/**
+ * SyncPolicy implementation that flush to HDFS periodically.
+ */
+public class TimedSyncPolicy implements SyncPolicy {
+    private final long interval;
+    private long lastPoint;
+
+    public TimedSyncPolicy(long interval) {
+        this.interval = interval;
+        this.lastPoint = System.currentTimeMillis();
+    }
+
+    @Override
+    public boolean mark(Tuple tuple, long offset) {
+        long currentPoint = System.currentTimeMillis();
+        if ((currentPoint - lastPoint) > interval) {
+            return true;
+        } else {
+            return false;
+        }
+    }
+
+    @Override
+    public void reset() {
+        this.lastPoint = System.currentTimeMillis();
+    }
+}

external/storm-hdfs/src/main/java/org/apache/storm/hdfs/trident/sync/CountSyncPolicy.java

@@ -26,7 +26,7 @@
  * have been processed.
  */
 public class CountSyncPolicy implements SyncPolicy {
-    private int count;
+    private final int count;
     private int executeCount = 0;
 
     public CountSyncPolicy(int count){

external/storm-hdfs/src/main/java/org/apache/storm/hdfs/trident/sync/TimedSyncPolicy.java

@@ -0,0 +1,48 @@
+/**
+ * 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.storm.hdfs.trident.sync;
+
+import org.apache.storm.trident.tuple.TridentTuple;
+
+/**
+ * SyncPolicy implementation that flush to HDFS periodically.
+ */
+public class TimedSyncPolicy implements SyncPolicy {
+    private final long interval;
+    private long lastPoint;
+
+    public TimedSyncPolicy(long interval) {
+        this.interval = interval;
+        this.lastPoint = System.currentTimeMillis();
+    }
+
+    @Override
+    public boolean mark(TridentTuple tuple, long offset) {
+        long currentPoint = System.currentTimeMillis();
+        if ((currentPoint - lastPoint) > interval) {
+            return true;
+        } else {
+            return false;
+        }
+    }
+
+    @Override
+    public void reset() {
+        this.lastPoint = System.currentTimeMillis();
+    }
+}