com.aspectran.core.util.ProcessRunner Maven / Gradle / Ivy
/*
* Copyright (c) 2008-2022 The Aspectran Project
*
* 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.aspectran.core.util;
import com.aspectran.core.util.logging.Logger;
import com.aspectran.core.util.logging.LoggerFactory;
import java.io.BufferedReader;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.util.concurrent.atomic.AtomicBoolean;
/**
* The ProcessRunner class helps running external processes.
*
* Created: 2019-04-12
*/
public class ProcessRunner {
private static final Logger logger = LoggerFactory.getLogger(ProcessRunner.class);
private final AtomicBoolean running = new AtomicBoolean();
private final AtomicBoolean terminated = new AtomicBoolean();
private final ProcessLogger processLogger;
private String workingDir;
private Process process;
public ProcessRunner() {
this(null);
}
public ProcessRunner(ProcessLogger processLogger) {
this.processLogger = processLogger;
}
public void setWorkingDir(String workingDir) {
this.workingDir = workingDir;
}
public int run(String[] command) throws IOException, InterruptedException {
return run(command, null);
}
public int run(String[] command, PrintWriter errOut) throws IOException, InterruptedException {
Assert.state(!running.get(), "There is already a running process");
running.set(true);
terminated.set(false);
try {
ProcessBuilder builder = new ProcessBuilder(command);
if (workingDir != null) {
builder.directory(new File(workingDir));
}
process = builder.start();
if (processLogger != null || logger.isDebugEnabled()) {
readNormalOutput(process);
}
if (errOut != null || processLogger != null || logger.isDebugEnabled()) {
readErrorOutput(process, errOut);
}
return process.waitFor();
} finally {
process = null;
running.set(false);
}
}
public void runInBackground(String[] command) {
new Thread(() -> {
try {
run(command);
} catch (Exception e) {
String message = "Error running process in background";
if (processLogger != null) {
processLogger.error(message, e);
}
logger.error(message, e);
}
}).start();
}
public boolean isRunning() {
return running.get();
}
public boolean isTerminated() {
return terminated.get();
}
public void terminate() {
if (isRunning() && process != null) {
terminated.set(true);
process.destroy();
}
}
private void readNormalOutput(Process process) {
try (InputStream is = process.getInputStream()) {
BufferedReader reader = new BufferedReader(new InputStreamReader(is));
String line;
while ((line = reader.readLine()) != null) {
if (processLogger != null) {
processLogger.info(line);
}
if (logger.isDebugEnabled()) {
logger.debug(line);
}
}
} catch (IOException e) {
// ignore
}
}
private void readErrorOutput(Process process, PrintWriter errOut) {
try (InputStream is = process.getErrorStream()) {
BufferedReader reader = new BufferedReader(new InputStreamReader(is));
String line;
while ((line = reader.readLine()) != null) {
if (errOut != null) {
errOut.println(line);
}
if (processLogger != null) {
processLogger.warn(line);
}
if (logger.isDebugEnabled()) {
logger.debug(line);
}
}
} catch (IOException e) {
// ignore
}
}
}