JMX API - Adding the CommitLogMBean stab

This holds the stab for the CommitLogMBean.

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

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

@@ -4,6 +4,7 @@
 package com.cloudius.urchin.main;
 
 import com.cloudius.urchin.api.APIClient;
+import org.apache.cassandra.db.commitlog.CommitLog;
 import org.apache.cassandra.net.MessagingService;
 import org.apache.cassandra.service.StorageService;
 
@@ -14,6 +15,7 @@ public class Main {
         System.out.println("Starting the JMX server");
         StorageService.getInstance();
         MessagingService.getInstance();
+        CommitLog.getInstance();
         Thread.sleep(Long.MAX_VALUE);
     }
 

src/main/java/org/apache/cassandra/db/commitlog/CommitLog.java

@@ -0,0 +1,123 @@
+/*
+ * 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.db.commitlog;
+
+import java.io.*;
+import java.lang.management.ManagementFactory;
+import java.util.*;
+
+import javax.management.MBeanServer;
+import javax.management.ObjectName;
+
+import com.cloudius.urchin.api.APIClient;
+
+/*
+ * Commit Log tracks every write operation into the system. The aim of the commit log is to be able to
+ * successfully recover data that was not stored to disk via the Memtable.
+ */
+public class CommitLog implements CommitLogMBean {
+
+    private static final java.util.logging.Logger logger = java.util.logging.Logger
+            .getLogger(CommitLog.class.getName());
+
+    private APIClient c = new APIClient();
+
+    public void log(String str) {
+        System.out.println(str);
+        logger.info(str);
+    }
+
+    private static final CommitLog instance = new CommitLog();
+
+    public static CommitLog getInstance() {
+        return instance;
+    }
+    private CommitLog() {
+        MBeanServer mbs = ManagementFactory.getPlatformMBeanServer();
+        try {
+            mbs.registerMBean(this, new ObjectName(
+                    "org.apache.cassandra.db:type=Commitlog"));
+        } catch (Exception e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    /**
+     * Get the number of completed tasks
+     *
+     * @see org.apache.cassandra.metrics.CommitLogMetrics#completedTasks
+     */
+    @Deprecated
+    public long getCompletedTasks() {
+        log(" getCompletedTasks()");
+        return c.getLongValue("");
+    }
+
+    /**
+     * Get the number of tasks waiting to be executed
+     *
+     * @see org.apache.cassandra.metrics.CommitLogMetrics#pendingTasks
+     */
+    @Deprecated
+    public long getPendingTasks() {
+        log(" getPendingTasks()");
+        return c.getLongValue("");
+    }
+
+    /**
+     * Get the current size used by all the commitlog segments.
+     *
+     * @see org.apache.cassandra.metrics.CommitLogMetrics#totalCommitLogSize
+     */
+    @Deprecated
+    public long getTotalCommitlogSize() {
+        log(" getTotalCommitlogSize()");
+        return c.getLongValue("");
+    }
+
+    /**
+     * Recover a single file.
+     */
+    public void recover(String path) throws IOException {
+        log(" recover(String path) throws IOException");
+    }
+
+    /**
+     * @return file names (not full paths) of active commit log segments
+     *         (segments containing unflushed data)
+     */
+    public List<String> getActiveSegmentNames() {
+        log(" getActiveSegmentNames()");
+        return c.getListStrValue("");
+    }
+
+    /**
+     * @return Files which are pending for archival attempt. Does NOT include
+     *         failed archive attempts.
+     */
+    public List<String> getArchivingSegmentNames() {
+        log(" getArchivingSegmentNames()");
+        return c.getListStrValue("");
+    }
+
+}

src/main/java/org/apache/cassandra/db/commitlog/CommitLogMBean.java

@@ -0,0 +1,64 @@
+/*
+ * 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.db.commitlog;
+
+import java.io.IOException;
+import java.util.List;
+
+public interface CommitLogMBean {
+    /**
+     * Get the number of completed tasks
+     *
+     * @see org.apache.cassandra.metrics.CommitLogMetrics#completedTasks
+     */
+    @Deprecated
+    public long getCompletedTasks();
+
+    /**
+     * Get the number of tasks waiting to be executed
+     *
+     * @see org.apache.cassandra.metrics.CommitLogMetrics#pendingTasks
+     */
+    @Deprecated
+    public long getPendingTasks();
+
+    /**
+     * Get the current size used by all the commitlog segments.
+     *
+     * @see org.apache.cassandra.metrics.CommitLogMetrics#totalCommitLogSize
+     */
+    @Deprecated
+    public long getTotalCommitlogSize();
+
+    /**
+     * Recover a single file.
+     */
+    public void recover(String path) throws IOException;
+
+    /**
+     * @return file names (not full paths) of active commit log segments
+     *         (segments containing unflushed data)
+     */
+    public List<String> getActiveSegmentNames();
+
+    /**
+     * @return Files which are pending for archival attempt. Does NOT include
+     *         failed archive attempts.
+     */
+    public List<String> getArchivingSegmentNames();
+}