| /* |
| * 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.geode.management.internal.beans; |
| |
| import java.util.ArrayList; |
| import java.util.HashMap; |
| import java.util.Iterator; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.concurrent.ConcurrentHashMap; |
| |
| import javax.management.ObjectName; |
| |
| import org.apache.geode.management.LockServiceMXBean; |
| import org.apache.geode.management.internal.FederationComponent; |
| import org.apache.geode.management.internal.ManagementConstants; |
| |
| /** |
| * Bridge for the Distributed lock service. It provides an aggregated view of a lock service which |
| * might be present in multiple members. |
| * |
| * Proxies are added as and when proxies are received by Federation framework. |
| * |
| * Each method which access all the proxies to gather data from them creates an Iterator. Iterates |
| * over them and gather data. Creating multiple iterator on each method call is a concern and a |
| * better way needs to be introduced. |
| * |
| * |
| */ |
| public class DistributedLockServiceBridge { |
| |
| /** |
| * Map of LockServiceMXBean proxies |
| */ |
| private Map<ObjectName, LockServiceMXBean> mapOfProxy; |
| |
| /** |
| * List of locks. keeping it member level to avoid object creation cost during each call. |
| */ |
| private List<String> listHeldLock; |
| |
| /** |
| * Map of threads holding lock |
| */ |
| private Map<String, String> threadsHoldingLock; |
| |
| /** |
| * set size of this proxy set |
| */ |
| private volatile int setSize; |
| |
| /** |
| * Public constructor |
| * |
| * @param objectName name of the MBean |
| * @param proxy reference to the proxy |
| */ |
| public DistributedLockServiceBridge(ObjectName objectName, LockServiceMXBean proxy, |
| FederationComponent newState) { |
| this.mapOfProxy = new ConcurrentHashMap<ObjectName, LockServiceMXBean>(); |
| this.listHeldLock = new ArrayList<String>(); |
| this.threadsHoldingLock = new HashMap<String, String>(); |
| addProxyToMap(objectName, proxy); |
| |
| } |
| |
| /** |
| * Add a proxy to the proxy map |
| * |
| * @param objectName name of the MBean |
| * @param proxy reference to the proxy |
| */ |
| public void addProxyToMap(ObjectName objectName, LockServiceMXBean proxy) { |
| if (mapOfProxy != null) { |
| mapOfProxy.put(objectName, proxy); |
| setSize = mapOfProxy.values().size(); |
| } |
| } |
| |
| /** |
| * |
| * @param objectName name of the MBean |
| * @param proxy reference to the proxy |
| * @return true if no proxies left for this aggregator to work on |
| */ |
| public boolean removeProxyFromMap(ObjectName objectName, LockServiceMXBean proxy) { |
| if (mapOfProxy != null) { |
| mapOfProxy.remove(objectName); |
| setSize = mapOfProxy.values().size(); |
| if (mapOfProxy.values().size() == 0) { |
| setSize = 0; |
| return true; |
| |
| } |
| } |
| return false; |
| } |
| |
| |
| |
| /** |
| * |
| * @return member name of the grantor |
| */ |
| public String fetchGrantorMember() { |
| Iterator<LockServiceMXBean> it = mapOfProxy.values().iterator(); |
| if (it != null) { |
| while (it.hasNext()) { |
| String grantorMember = it.next().fetchGrantorMember(); |
| return grantorMember; |
| } |
| } |
| return null; |
| } |
| |
| /** |
| * |
| * @return number of members using this lock service |
| */ |
| public int getMemberCount() { |
| |
| return setSize; |
| } |
| |
| /** |
| * |
| * @return list of members using this lock service |
| */ |
| public String[] getMemberNames() { |
| Iterator<LockServiceMXBean> it = mapOfProxy.values().iterator(); |
| if (it != null) { |
| while (it.hasNext()) { |
| String[] memberNames = it.next().getMemberNames(); |
| return memberNames; |
| } |
| |
| } |
| return ManagementConstants.NO_DATA_STRING; |
| } |
| |
| /** |
| * |
| * @return name of the lock service |
| */ |
| public String getName() { |
| Iterator<LockServiceMXBean> it = mapOfProxy.values().iterator(); |
| if (it != null) { |
| while (it.hasNext()) { |
| String name = it.next().getName(); |
| return name; |
| } |
| |
| } |
| return null; |
| } |
| |
| /** |
| * |
| * @return lists the name of locks held by this member's threads |
| */ |
| public String[] listHeldLocks() { |
| Iterator<LockServiceMXBean> it = mapOfProxy.values().iterator(); |
| listHeldLock.clear(); |
| if (it != null) { |
| while (it.hasNext()) { |
| String[] locks = it.next().listHeldLocks(); |
| if (locks != null && locks.length > 0) { |
| for (String lock : locks) { |
| listHeldLock.add(lock); |
| } |
| } |
| |
| } |
| |
| } |
| String[] tmpStr = new String[listHeldLock.size()]; |
| return listHeldLock.toArray(tmpStr); |
| |
| } |
| |
| /** |
| * |
| * @return a map of object name and thread name if this member holds lock or null/none |
| */ |
| public Map<String, String> listThreadsHoldingLock() { |
| Iterator<LockServiceMXBean> it = mapOfProxy.values().iterator(); |
| threadsHoldingLock.clear(); |
| if (it != null) { |
| while (it.hasNext()) { |
| Map<String, String> threadLockMap = it.next().listThreadsHoldingLock(); |
| if (threadLockMap != null) { |
| threadsHoldingLock.putAll(threadLockMap); |
| } |
| |
| |
| } |
| |
| } |
| return threadsHoldingLock; |
| } |
| |
| } |