renamed packages from 'google' to 'apache' and updated necessary imports

src/main/java/org/apache/gossip/manager/ActiveGossipThread.java

@@ -0,0 +1,76 @@
+/*
+ * 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.gossip.manager;
+
+import java.util.List;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.atomic.AtomicBoolean;
+
+import org.apache.gossip.GossipService;
+import org.apache.gossip.LocalGossipMember;
+
+/**
+ * [The active thread: periodically send gossip request.] The class handles gossiping the membership
+ * list. This information is important to maintaining a common state among all the nodes, and is
+ * important for detecting failures.
+ */
+abstract public class ActiveGossipThread implements Runnable {
+
+  protected final GossipManager gossipManager;
+
+  private final AtomicBoolean keepRunning;
+
+  public ActiveGossipThread(GossipManager gossipManager) {
+    this.gossipManager = gossipManager;
+    this.keepRunning = new AtomicBoolean(true);
+  }
+
+  @Override
+  public void run() {
+    while (keepRunning.get()) {
+      try {
+        TimeUnit.MILLISECONDS.sleep(gossipManager.getSettings().getGossipInterval());
+        sendMembershipList(gossipManager.getMyself(), gossipManager.getMemberList());
+      } catch (InterruptedException e) {
+        GossipService.LOGGER.error(e);
+        keepRunning.set(false);
+      }
+    }
+    shutdown();
+  }
+
+  public void shutdown() {
+    keepRunning.set(false);
+  }
+
+  /**
+   * Performs the sending of the membership list, after we have incremented our own heartbeat.
+   */
+  abstract protected void sendMembershipList(LocalGossipMember me,
+          List<LocalGossipMember> memberList);
+
+  /**
+   * Abstract method which should be implemented by a subclass. This method should return a member
+   * of the list to gossip with.
+   * 
+   * @param memberList
+   *          The list of members which are stored in the local list of members.
+   * @return The chosen LocalGossipMember to gossip with.
+   */
+  abstract protected LocalGossipMember selectPartner(List<LocalGossipMember> memberList);
+}