Rename ApplicationPidListener
Rename ApplicationPidListener to ApplicationPidFileWriter (keeping the old class in a deprecated form) Fixes gh-1673pull/1840/head
Phillip Webb
10 years ago
parent
c7455040df
commit
77ccd9a80b
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/*
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* Copyright 2010-2014 the original author or authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.springframework.boot.actuate.system;
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import java.io.File;
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import java.util.concurrent.atomic.AtomicBoolean;
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import org.apache.commons.logging.Log;
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import org.apache.commons.logging.LogFactory;
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import org.springframework.boot.ApplicationPid;
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import org.springframework.boot.context.event.ApplicationStartedEvent;
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import org.springframework.context.ApplicationListener;
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import org.springframework.core.Ordered;
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import org.springframework.util.Assert;
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/**
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* An {@link ApplicationListener} that saves application PID into file. This application
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* listener will be triggered exactly once per JVM, and the file name can be overridden at
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* runtime with a System property or environment variable named "PIDFILE" (or "pidfile").
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*
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* @author Jakub Kubrynski
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* @author Dave Syer
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* @author Phillip Webb
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* @since 1.2.0
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*/
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public class ApplicationPidFileWriter implements
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ApplicationListener<ApplicationStartedEvent>, Ordered {
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private static final Log logger = LogFactory.getLog(ApplicationPidFileWriter.class);
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private static final String DEFAULT_FILE_NAME = "application.pid";
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private static final String[] PROPERTY_VARIABLES = { "PIDFILE", "pidfile" };
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private static final AtomicBoolean created = new AtomicBoolean(false);
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private int order = Ordered.HIGHEST_PRECEDENCE + 13;
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private final File file;
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/**
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* Create a new {@link ApplicationPidFileWriter} instance using the filename
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* 'application.pid'.
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*/
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public ApplicationPidFileWriter() {
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this.file = new File(DEFAULT_FILE_NAME);
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}
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/**
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* Create a new {@link ApplicationPidFileWriter} instance with a specified filename.
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* @param filename the name of file containing pid
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*/
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public ApplicationPidFileWriter(String filename) {
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this(new File(filename));
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}
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/**
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* Create a new {@link ApplicationPidFileWriter} instance with a specified file.
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* @param file the file containing pid
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*/
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public ApplicationPidFileWriter(File file) {
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Assert.notNull(file, "File must not be null");
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String override = getOverride();
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if (override != null) {
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this.file = new File(override);
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}
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else {
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this.file = file;
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}
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}
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private String getOverride() {
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for (String property : PROPERTY_VARIABLES) {
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try {
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String override = System.getProperty(property);
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override = (override != null ? override : System.getenv(property));
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if (override != null) {
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return override;
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}
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}
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catch (Throwable ex) {
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System.err.println("Could not resolve '" + property
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+ "' as system property: " + ex);
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}
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}
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return null;
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}
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@Override
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public void onApplicationEvent(ApplicationStartedEvent event) {
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if (created.compareAndSet(false, true)) {
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try {
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new ApplicationPid().write(this.file);
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this.file.deleteOnExit();
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}
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catch (Exception ex) {
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logger.warn(String.format("Cannot create pid file %s", this.file));
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}
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}
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}
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public void setOrder(int order) {
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this.order = order;
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}
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@Override
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public int getOrder() {
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return this.order;
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}
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/**
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* Reset the created flag for testing purposes.
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*/
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static void reset() {
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created.set(false);
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}
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}
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