Java tutorial
/* * Copyright 2014 NAVER Corp. * * Licensed 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 com.navercorp.pinpoint.collector.dao; import java.util.List; import java.util.concurrent.Executors; import java.util.concurrent.ScheduledExecutorService; import java.util.concurrent.ThreadFactory; import java.util.concurrent.TimeUnit; import org.apache.commons.collections.CollectionUtils; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.springframework.beans.factory.annotation.Autowired; import com.navercorp.pinpoint.common.util.PinpointThreadFactory; /** * * @author netspider * @author emeroad */ public class AutoFlusher { private final Logger logger = LoggerFactory.getLogger(this.getClass()); private ScheduledExecutorService executor; private long flushPeriod = 1000; @Autowired private List<CachedStatisticsDao> cachedStatisticsDaoList; public long getFlushPeriod() { return flushPeriod; } public void setFlushPeriod(long flushPeriod) { this.flushPeriod = flushPeriod; } private static final class Worker implements Runnable { private final Logger logger = LoggerFactory.getLogger(this.getClass()); private final CachedStatisticsDao dao; public Worker(CachedStatisticsDao dao) { this.dao = dao; } @Override public void run() { try { dao.flushAll(); } catch (Throwable th) { logger.error("AutoFlusherWorker failed. Caused:{}", th.getMessage(), th); } } } public void initialize() { if (CollectionUtils.isEmpty(cachedStatisticsDaoList)) { return; } ThreadFactory threadFactory = PinpointThreadFactory.createThreadFactory(this.getClass().getSimpleName()); executor = Executors.newScheduledThreadPool(cachedStatisticsDaoList.size(), threadFactory); for (CachedStatisticsDao dao : cachedStatisticsDaoList) { executor.scheduleAtFixedRate(new Worker(dao), 0L, flushPeriod, TimeUnit.MILLISECONDS); } logger.info("Auto flusher initialized."); } public void shutdown() { logger.info("Shutdown auto flusher."); shutdownExecutor(); for (CachedStatisticsDao dao : cachedStatisticsDaoList) { dao.flushAll(); } } private void shutdownExecutor() { executor.shutdown(); try { executor.awaitTermination(3000 + flushPeriod, TimeUnit.MILLISECONDS); } catch (InterruptedException e) { Thread.currentThread().interrupt(); } } public void setCachedStatisticsDaoList(List<CachedStatisticsDao> cachedStatisticsDaoList) { this.cachedStatisticsDaoList = cachedStatisticsDaoList; } }