| /** |
| * 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.geronimo.microprofile.reporter.storage.plugins; |
| |
| import static java.lang.Thread.NORM_PRIORITY; |
| import static java.util.concurrent.TimeUnit.MILLISECONDS; |
| import static java.util.concurrent.TimeUnit.SECONDS; |
| |
| import java.util.concurrent.Executors; |
| import java.util.concurrent.ScheduledExecutorService; |
| import java.util.concurrent.ScheduledFuture; |
| |
| import javax.enterprise.context.ApplicationScoped; |
| import javax.enterprise.context.Destroyed; |
| import javax.enterprise.context.Initialized; |
| import javax.enterprise.event.Event; |
| import javax.enterprise.event.Observes; |
| import javax.inject.Inject; |
| import javax.servlet.ServletContext; |
| |
| import org.eclipse.microprofile.config.inject.ConfigProperty; |
| |
| @ApplicationScoped |
| public class Poller { |
| private static final Tick TICK = new Tick(); |
| |
| private ScheduledExecutorService scheduler; |
| |
| private ScheduledFuture<?> pollFuture; |
| |
| @Inject |
| private Event<Tick> tickEvent; |
| |
| void onStart(@Observes @Initialized(ApplicationScoped.class) final Object start, |
| @ConfigProperty(name = "geronimo.microprofile.reporter.polling.interval", defaultValue = "5000") final Long pollingInterval) { |
| if (pollingInterval <= 0) { |
| return; |
| } |
| |
| final ClassLoader appLoader = Thread.currentThread().getContextClassLoader(); |
| scheduler = Executors.newSingleThreadScheduledExecutor(r -> { |
| final Thread thread = new Thread(r, "geronimo-microprofile-reporter-poller-" + name(start)); |
| thread.setContextClassLoader(appLoader); |
| if (thread.isDaemon()) { |
| thread.setDaemon(false); |
| } |
| if (thread.getPriority() != NORM_PRIORITY) { |
| thread.setPriority(NORM_PRIORITY); |
| } |
| return thread; |
| }); |
| pollFuture = scheduler.scheduleAtFixedRate(() -> tickEvent.fire(TICK), pollingInterval, pollingInterval, MILLISECONDS); |
| } |
| |
| void onStop(@Observes @Destroyed(ApplicationScoped.class) final Object stop) { |
| if (pollFuture != null) { |
| pollFuture.cancel(true); |
| pollFuture = null; |
| } |
| if (scheduler != null) { |
| scheduler.shutdownNow(); |
| try { |
| scheduler.awaitTermination(10, SECONDS); |
| } catch (final InterruptedException e) { |
| Thread.currentThread().interrupt(); |
| } |
| scheduler = null; |
| } |
| } |
| |
| private String name(final Object start) { |
| if (ServletContext.class.isInstance(start)) { |
| final ServletContext context = ServletContext.class.cast(start); |
| try { |
| return "[web=" + context.getVirtualServerName() + '/' + context.getContextPath() + "]"; |
| } catch (final Error | Exception e) { // no getVirtualServerName() for this context |
| return "[web=" + context.getContextPath() + "]"; |
| } |
| } |
| return start.toString(); |
| } |
| } |