org.springframework.boot.ApplicationPid Maven / Gradle / Ivy
/*
* Copyright 2012-2014 the original author or authors.
*
* 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 org.springframework.boot;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.lang.management.ManagementFactory;
import org.springframework.util.Assert;
import org.springframework.util.ObjectUtils;
/**
* An application process ID.
*
* @author Phillip Webb
*/
public class ApplicationPid {
private final String pid;
public ApplicationPid() {
this.pid = getPid();
}
protected ApplicationPid(String pid) {
this.pid = pid;
}
private String getPid() {
try {
String jvmName = ManagementFactory.getRuntimeMXBean().getName();
return jvmName.split("@")[0];
}
catch (Throwable ex) {
return null;
}
}
@Override
public String toString() {
return (this.pid == null ? "???" : this.pid);
}
@Override
public int hashCode() {
return ObjectUtils.nullSafeHashCode(this.pid);
}
@Override
public boolean equals(Object obj) {
if (obj == this) {
return true;
}
if (obj != null && obj instanceof ApplicationPid) {
return ObjectUtils.nullSafeEquals(this.pid, ((ApplicationPid) obj).pid);
}
return false;
}
/**
* Write the PID to the specified file.
* @throws IllegalStateException if no PID is available.
* @throws IOException if the file cannot be written
*/
public void write(File file) throws IOException {
Assert.state(this.pid != null, "No PID available");
createParentFolder(file);
FileWriter writer = new FileWriter(file);
try {
writer.append(this.pid);
}
finally {
writer.close();
}
}
private void createParentFolder(File file) {
File parent = file.getParentFile();
if (parent != null) {
parent.mkdirs();
}
}
}