DMAAP-MR - Merge MR repos

[dmaap/messagerouter/messageservice.git] / src / main / java / org / onap / dmaap / dmf / mr / backends / kafka / LockInstructionWatcher.java

diff --git a/src/main/java/org/onap/dmaap/dmf/mr/backends/kafka/LockInstructionWatcher.java b/src/main/java/org/onap/dmaap/dmf/mr/backends/kafka/LockInstructionWatcher.java
new file mode 100644 (file)
index 0000000..7dc41bd
--- /dev/null
+++ b/src/main/java/org/onap/dmaap/dmf/mr/backends/kafka/LockInstructionWatcher.java
@@ -0,0 +1,99 @@
+/*******************************************************************************
+ *  ============LICENSE_START=======================================================
+ *  org.onap.dmaap
+ *  ================================================================================
+ *  Copyright © 2017 AT&T Intellectual Property. All rights reserved.
+ *  ================================================================================
+ *  Licensed 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.
+ *  ============LICENSE_END=========================================================
+ *  
+ *  ECOMP is a trademark and service mark of AT&T Intellectual Property.
+ *  
+ *******************************************************************************/
+package org.onap.dmaap.dmf.mr.backends.kafka;
+
+import com.att.eelf.configuration.EELFLogger;
+import com.att.eelf.configuration.EELFManager;
+import org.apache.curator.framework.CuratorFramework;
+import org.apache.zookeeper.WatchedEvent;
+import org.apache.zookeeper.Watcher;
+
+import java.util.List;
+
+/**
+ * 
+ * LockInstructionWatcher
+ * A package-private class used internally by the KafkaLiveLockAvoider.  
+ * 
+ * This class implements the zookeeper Watcher callback and listens for changes on child nodes changing.
+ * Each child node is actually a Kafka group name that needs to be soft polled.  Deletion of the child nodes
+ * after soft poll unlocking is finished.
+ * 
+ *
+ */
+public class LockInstructionWatcher implements Watcher {
+       
+       private CuratorFramework curatorFramework;
+       private LiveLockAvoidance avoidanceCallback;
+       private KafkaLiveLockAvoider2 avoider;
+       
+       private static final EELFLogger log = EELFManager.getInstance().getLogger(LockInstructionWatcher.class.getName());
+       
+
+       public LockInstructionWatcher(CuratorFramework curatorFramework, LiveLockAvoidance avoidanceCallback,
+                       KafkaLiveLockAvoider2 avoider) {
+               super();
+               this.curatorFramework = curatorFramework;
+               this.avoidanceCallback = avoidanceCallback;
+               this.avoider = avoider;
+       }
+
+
+       @Override
+       public void process(WatchedEvent event) {
+               
+               switch (event.getType()) {
+               case NodeChildrenChanged:
+                       
+
+                       try {
+                               
+                               log.info("node children changed at path: {}", event.getPath());
+                               
+                               List<String> children = curatorFramework.getChildren().forPath(event.getPath());
+                               
+                               log.info("found children nodes prodcessing now");
+                               for (String child : children) {
+                                       String childPath = String.format("%s/%s", event.getPath(), child);
+                                       log.info("Processing child task at node {}",childPath);
+                                       avoidanceCallback.handleRebalanceUnlock( child);
+                                       log.info("Deleting child task at node {}",childPath);
+                                       curatorFramework.delete().forPath(childPath);
+                                       } 
+                               //reset the watch with the avoider
+                               avoider.assignNewProcessNode(avoidanceCallback.getAppId(), this);
+                       
+                               
+                       } catch (Exception e) {
+                               log.error("Error manipulating ZNode data in watcher",e);
+                       }
+                       
+                       break;
+
+               default:
+                       log.info("Listner fired on path: {}, with event: {}", event.getPath(), event.getType());
+                       break;
+               }
+       }
+       
+
+}