| /* |
| * 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.concurrent.ScheduledExecutorService; |
| import java.util.concurrent.TimeUnit; |
| |
| import org.apache.logging.log4j.Logger; |
| |
| import org.apache.geode.CancelCriterion; |
| import org.apache.geode.Statistics; |
| import org.apache.geode.SystemFailure; |
| import org.apache.geode.internal.logging.LogService; |
| import org.apache.geode.internal.logging.LoggingExecutors; |
| |
| public class CallbackSampler { |
| private static final Logger logger = LogService.getLogger(); |
| private StatisticsManager statisticsManager; |
| private final CancelCriterion cancelCriterion; |
| private long sampleIntervalNanos; |
| private ScheduledExecutorService executor; |
| private final StatSamplerStats statSamplerStats; |
| |
| public CallbackSampler(final CancelCriterion cancelCriterion, |
| final StatSamplerStats statSamplerStats) { |
| this.cancelCriterion = cancelCriterion; |
| this.statSamplerStats = statSamplerStats; |
| } |
| |
| public void start(StatisticsManager statisticsManager, int sampleInterval, TimeUnit timeUnit) { |
| ScheduledExecutorService executor = |
| LoggingExecutors.newSingleThreadScheduledExecutor("CallbackSampler"); |
| start(executor, statisticsManager, sampleInterval, timeUnit); |
| } |
| |
| void start(ScheduledExecutorService executor, StatisticsManager statisticsManager, |
| int sampleInterval, TimeUnit timeUnit) { |
| stop(); |
| this.statisticsManager = statisticsManager; |
| this.executor = executor; |
| |
| executor.scheduleAtFixedRate(() -> sampleCallbacks(), sampleInterval, sampleInterval, timeUnit); |
| } |
| |
| private void sampleCallbacks() { |
| if (cancelCriterion.isCancelInProgress()) { |
| executor.shutdown(); |
| } |
| int errors = 0; |
| int suppliers = 0; |
| long start = System.nanoTime(); |
| try { |
| for (Statistics stats : statisticsManager.getStatsList()) { |
| StatisticsImpl statistics = (StatisticsImpl) stats; |
| errors += statistics.updateSuppliedValues(); |
| suppliers += statistics.getSupplierCount(); |
| } |
| } catch (VirtualMachineError e) { |
| SystemFailure.initiateFailure(e); |
| } catch (Throwable throwable) { |
| logger.error("Error invoking statistic suppliers", throwable); |
| } finally { |
| long end = System.nanoTime(); |
| statSamplerStats.incSampleCallbackDuration(TimeUnit.NANOSECONDS.toMillis(end - start)); |
| statSamplerStats.incSampleCallbackErrors(errors); |
| statSamplerStats.setSampleCallbacks(suppliers); |
| } |
| |
| } |
| |
| public void stop() { |
| if (executor != null) { |
| this.executor.shutdown(); |
| } |
| } |
| } |