| /* |
| * 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.internal.statistics; |
| |
| import java.util.List; |
| import java.util.Set; |
| import java.util.concurrent.ConcurrentHashMap; |
| |
| /** |
| * TODO: define another addStatistic for StatisticDescriptor which will enable static monitoring |
| * that will fire for all instances even ones that may not yet be created at the time this monitor |
| * is defined |
| * |
| * @since GemFire 7.0 |
| */ |
| public abstract class StatisticsMonitor { |
| |
| private final Object mutex = new Object(); |
| |
| private final Set<StatisticsListener> listeners = ConcurrentHashMap.newKeySet(); |
| |
| private final Set<StatisticId> statisticIds = ConcurrentHashMap.newKeySet(); |
| |
| public StatisticsMonitor() {} |
| |
| public StatisticsMonitor addStatistic(final StatisticId statId) { |
| if (statId == null) { |
| throw new NullPointerException("StatisticId is null"); |
| } |
| statisticIds.add(statId); |
| return this; |
| } |
| |
| public StatisticsMonitor removeStatistic(final StatisticId statId) { |
| if (statId == null) { |
| throw new NullPointerException("StatisticId is null"); |
| } |
| statisticIds.remove(statId); |
| return this; |
| } |
| |
| public void addListener(final StatisticsListener listener) { |
| if (listener == null) { |
| throw new NullPointerException("StatisticsListener is null"); |
| } |
| synchronized (mutex) { |
| if (!listeners.contains(listener)) { |
| listeners.add(listener); |
| getStatMonitorHandler().addMonitor(this); |
| } |
| } |
| } |
| |
| public void removeListener(final StatisticsListener listener) { |
| if (listener == null) { |
| throw new NullPointerException("StatisticsListener is null"); |
| } |
| synchronized (mutex) { |
| if (listeners.contains(listener)) { |
| listeners.remove(listener); |
| if (listeners.isEmpty()) { |
| try { |
| getStatMonitorHandler().removeMonitor(this); |
| } catch (IllegalStateException ignore) { |
| // sample collector and handlers were closed (ok on removal) |
| } |
| } |
| } |
| } |
| } |
| |
| /** |
| * This method may be overridden but please ensure that you invoke super.monitor(long, List) from |
| * this method in the subclass. |
| * |
| * @param millisTimeStamp the real time in millis of the sample |
| * @param resourceInstances resources with one or more updated values |
| */ |
| protected void monitor(final long millisTimeStamp, |
| final List<ResourceInstance> resourceInstances) { |
| monitorStatisticIds(millisTimeStamp, resourceInstances); |
| } |
| |
| private void monitorStatisticIds(final long millisTimeStamp, |
| final List<ResourceInstance> resourceInstances) { |
| if (!statisticIds.isEmpty()) { |
| // TODO: |
| } |
| } |
| |
| protected void notifyListeners(final StatisticsNotification notification) { |
| for (StatisticsListener listener : listeners) { |
| listener.handleNotification(notification); |
| } |
| } |
| |
| protected Object mutex() { |
| return mutex; |
| } |
| |
| StatMonitorHandler getStatMonitorHandler() { |
| return SampleCollector.getStatMonitorHandler(); |
| } |
| |
| /** |
| * For testing only |
| * |
| */ |
| Set<StatisticsListener> getStatisticsListenersSnapshot() { |
| return listeners; |
| } |
| |
| @Override |
| public String toString() { |
| final StringBuilder sb = new StringBuilder(getClass().getName()); |
| sb.append("@").append(System.identityHashCode(this)).append("{"); |
| sb.append("statisticIds=").append(statisticIds); |
| sb.append(", listeners=").append(listeners); |
| final StringBuilder toAppend = appendToString(); |
| if (toAppend == null) { |
| sb.append(", ").append(toAppend); |
| } |
| sb.append("}"); |
| return sb.toString(); |
| } |
| |
| /** |
| * Override to append to toString() |
| */ |
| protected StringBuilder appendToString() { |
| return null; |
| } |
| } |