/*
* Copyright 2010-2013 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.cloud.stream.modules.test.gemfire.process;
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import org.springframework.cloud.stream.modules.test.gemfire.support.FileSystemUtils;
import org.springframework.util.Assert;
import org.springframework.util.StringUtils;
/**
* The ProcessExecutor class is a utility class for launching and running Java processes.
* @author John Blum
* @see java.lang.Process
* @see java.lang.ProcessBuilder
* @see ProcessConfiguration
* @see ProcessWrapper
* @since 1.5.0
*/
public abstract class ProcessExecutor {
public static final File JAVA_EXE = new File(new File(System.getProperty("java.home"), "bin"), "java");
public static final String JAVA_CLASSPATH = System.getProperty("java.class.path");
protected static final String SPRING_GEMFIRE_SYSTEM_PROPERTY_PREFIX = "spring.gemfire.";
public static ProcessWrapper launch(Class<?> type, String... args) throws IOException {
return launch(FileSystemUtils.WORKING_DIRECTORY, type, args);
}
public static ProcessWrapper launch(File workingDirectory, Class<?> type, String... args) throws IOException {
return launch(workingDirectory, JAVA_CLASSPATH, type, args);
}
public static ProcessWrapper launch(File workingDirectory, String classpath, Class<?> type, String... args)
throws IOException {
ProcessBuilder processBuilder = new ProcessBuilder()
.command(buildCommand(classpath, type, args))
.directory(validateDirectory(workingDirectory))
.redirectErrorStream(true);
Process process = processBuilder.start();
ProcessWrapper processWrapper = new ProcessWrapper(process, ProcessConfiguration.create(processBuilder));
processWrapper.register(new ProcessInputStreamListener() {
@Override
public void onInput(final String input) {
System.err.printf("[FORK-OUT] - %1$s%n", input);
}
});
return processWrapper;
}
protected static String[] buildCommand(String classpath, Class<?> type, String... args) {
Assert.notNull(type, "The main Java class to launch must not be null!");
List<String> command = new ArrayList<String>();
List<String> programArgs = Collections.emptyList();
command.add(JAVA_EXE.getAbsolutePath());
command.add("-server");
command.add("-classpath");
command.add(StringUtils.hasText(classpath) ? classpath : JAVA_CLASSPATH);
command.addAll(getSpringGemFireSystemProperties());
if (args != null) {
programArgs = new ArrayList<String>(args.length);
for (String arg : args) {
if (isJvmOption(arg)) {
command.add(arg);
}
else if (!StringUtils.isEmpty(arg)) {
programArgs.add(arg);
}
}
}
command.add(type.getName());
command.addAll(programArgs);
return command.toArray(new String[command.size()]);
}
protected static Collection<? extends String> getSpringGemFireSystemProperties() {
List<String> springGemfireSystemProperties = new ArrayList<String>();
for (String property : System.getProperties().stringPropertyNames()) {
if (property.startsWith(SPRING_GEMFIRE_SYSTEM_PROPERTY_PREFIX)) {
springGemfireSystemProperties.add(String.format("-D%1$s=%2$s", property,
System.getProperty(property)));
}
}
return springGemfireSystemProperties;
}
protected static boolean isJvmOption(final String option) {
return (!StringUtils.isEmpty(option) && (option.startsWith("-D") || option.startsWith("-X")));
}
protected static File validateDirectory(final File workingDirectory) {
Assert.isTrue(workingDirectory != null && (workingDirectory.isDirectory() || workingDirectory.mkdirs()));
return workingDirectory;
}
}