JMX API: Add the GossiperMBean stab

This adds a stab implementation of the GossiperMBean

Signed-off-by: Amnon Heiman <amnon@cloudius-systems.com>

src/main/java/com/cloudius/urchin/main/Main.java

@@ -4,7 +4,9 @@
 package com.cloudius.urchin.main;
 
 import com.cloudius.urchin.api.APIClient;
+
 import org.apache.cassandra.db.commitlog.CommitLog;
+import org.apache.cassandra.gms.Gossiper;
 import org.apache.cassandra.net.MessagingService;
 import org.apache.cassandra.service.StorageService;
 
@@ -16,6 +18,7 @@ public class Main {
         StorageService.getInstance();
         MessagingService.getInstance();
         CommitLog.getInstance();
+        Gossiper.getInstance();
         Thread.sleep(Long.MAX_VALUE);
     }
 

src/main/java/org/apache/cassandra/gms/Gossiper.java

@@ -0,0 +1,98 @@
+/*
+ * 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.
+ */
+
+/*
+ * Copyright 2015 Cloudius Systems
+ *
+ * Modified by Cloudius Systems
+ */
+package org.apache.cassandra.gms;
+
+import java.lang.management.ManagementFactory;
+import java.net.UnknownHostException;
+import javax.management.MBeanServer;
+import javax.management.ObjectName;
+
+import com.cloudius.urchin.api.APIClient;
+
+/**
+ * This module is responsible for Gossiping information for the local endpoint.
+ * This abstraction maintains the list of live and dead endpoints. Periodically
+ * i.e. every 1 second this module chooses a random node and initiates a round
+ * of Gossip with it. A round of Gossip involves 3 rounds of messaging. For
+ * instance if node A wants to initiate a round of Gossip with node B it starts
+ * off by sending node B a GossipDigestSynMessage. Node B on receipt of this
+ * message sends node A a GossipDigestAckMessage. On receipt of this message
+ * node A sends node B a GossipDigestAck2Message which completes a round of
+ * Gossip. This module as and when it hears one of the three above mentioned
+ * messages updates the Failure Detector with the liveness information. Upon
+ * hearing a GossipShutdownMessage, this module will instantly mark the remote
+ * node as down in the Failure Detector.
+ */
+
+public class Gossiper implements GossiperMBean {
+    public static final String MBEAN_NAME = "org.apache.cassandra.net:type=Gossiper";
+
+    private static final java.util.logging.Logger logger = java.util.logging.Logger
+            .getLogger(Gossiper.class.getName());
+
+    private APIClient c = new APIClient();
+
+    public void log(String str) {
+        System.out.println(str);
+        logger.info(str);
+    }
+
+    private static final Gossiper instance = new Gossiper();
+
+    public static Gossiper getInstance() {
+        return instance;
+    }
+
+    private Gossiper() {
+
+        // Register this instance with JMX
+        try {
+            MBeanServer mbs = ManagementFactory.getPlatformMBeanServer();
+            mbs.registerMBean(this, new ObjectName(MBEAN_NAME));
+        } catch (Exception e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    public long getEndpointDowntime(String address) throws UnknownHostException {
+        log(" getEndpointDowntime(String address) throws UnknownHostException");
+        return c.getLongValue("");
+    }
+
+    public int getCurrentGenerationNumber(String address)
+            throws UnknownHostException {
+        log(" getCurrentGenerationNumber(String address) throws UnknownHostException");
+        return c.getIntValue("");
+    }
+
+    public void unsafeAssassinateEndpoint(String address)
+            throws UnknownHostException {
+        log(" unsafeAssassinateEndpoint(String address) throws UnknownHostException");
+    }
+
+    public void assassinateEndpoint(String address) throws UnknownHostException {
+        log(" assassinateEndpoint(String address) throws UnknownHostException");
+    }
+
+}

src/main/java/org/apache/cassandra/gms/GossiperMBean.java

@@ -0,0 +1,32 @@
+/*
+ * 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.cassandra.gms;
+
+import java.net.UnknownHostException;
+
+public interface GossiperMBean
+{
+    public long getEndpointDowntime(String address) throws UnknownHostException;
+
+    public int getCurrentGenerationNumber(String address) throws UnknownHostException;
+
+    public void unsafeAssassinateEndpoint(String address) throws UnknownHostException;
+
+    public void assassinateEndpoint(String address) throws UnknownHostException;
+
+}