ninja.build.RunClassInSeparateJvmMachine Maven / Gradle / Ivy
/**
* Copyright (C) 2012- 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 ninja.build;
import java.io.File;
import java.io.IOException;
import java.util.List;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.atomic.AtomicBoolean;
import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.zeroturnaround.exec.ProcessExecutor;
import org.zeroturnaround.exec.ProcessResult;
import org.zeroturnaround.exec.StartedProcess;
import org.zeroturnaround.exec.listener.ProcessListener;
public class RunClassInSeparateJvmMachine {
static private final Logger log = LoggerFactory.getLogger(RunClassInSeparateJvmMachine.class);
private final String name;
private OutputStream output;
StartedProcess activeProcess;
private final AtomicBoolean restarting;
// Main class that will be used to load...
private final String classNameWithMainToRun;
private final String classpath;
private final List jvmArguments;
// basedir of project this plugin run in
private final File mavenBaseDir;
public RunClassInSeparateJvmMachine(
String name,
String classNameWithMainToRun,
List classpath,
List jvmArguments,
File mavenBaseDir) {
this(name,
classNameWithMainToRun,
StringUtils.join(classpath, File.pathSeparator),
jvmArguments,
mavenBaseDir);
}
public RunClassInSeparateJvmMachine(
String name,
String classNameWithMainToRun,
String classpath,
List jvmArguments,
File mavenBaseDir) {
this.name = name;
this.output = System.out;
this.classNameWithMainToRun = classNameWithMainToRun;
this.classpath = classpath;
this.jvmArguments = jvmArguments;
this.mavenBaseDir = mavenBaseDir;
this.restarting = new AtomicBoolean(false);
}
public OutputStream getOutput() {
return output;
}
public void setOutput(OutputStream output) {
this.output = output;
}
public StartedProcess getActiveProcess() {
return activeProcess;
}
public void setActiveProcess(StartedProcess activeProcess) {
this.activeProcess = activeProcess;
}
public synchronized void restart() {
restarting.set(true);
try {
if (this.activeProcess != null) {
log.debug("Attempting to destroy previous {} process", name);
this.activeProcess.getProcess().destroy();
log.debug("Waiting for previous {} process to terminate", name);
ProcessResult result =
this.activeProcess.getFuture().get();
}
log.debug("Starting new {}", name);
this.activeProcess = startProcess();
} catch (ExecutionException | InterruptedException | IOException e) {
log.error("Something fishy happenend. Unable to cleanly restart {}!", name, e);
log.error("You'll probably need to restart maven?");
} finally {
restarting.set(false);
}
}
StartedProcess startProcess() throws IOException {
ProcessExecutor processExecutor
= buildProcessExecutor();
return processExecutor.start();
}
ProcessExecutor buildProcessExecutor() {
List commandLine = new ArrayList<>();
String javaHome = System.getProperty("java.home");
String javaBin = javaHome + File.separator + "bin" + File.separator
+ "java";
commandLine.add(javaBin);
commandLine.addAll(jvmArguments);
commandLine.add("-cp");
commandLine.add(classpath);
commandLine.add(classNameWithMainToRun);
// not redirecting error stream used for unit tests
return new ProcessExecutor(commandLine)
.directory(mavenBaseDir)
.destroyOnExit()
.addListener(new ProcessListener() {
@Override
public void afterStop(Process process) {
if (!restarting.get()) {
log.error("JVM process for {} terminated (next file change will attempt to restart it)", name);
}
}
})
.redirectErrorStream(true)
.redirectOutput(this.output);
}
}