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/*
* Copyright 2002-2014 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.util.exec;
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
/**
* Class to execute processes in the background. These processes
* will not exit once the controlling Java process exits.
*/
public class Background {
/**
* Execute the command (and its args, ala Runtime.exec), sending the
* output and error streams to the void.
*
* @param cmd The command and args.
* @throws IOException Any.
*/
public static void exec(String[] cmd)
throws IOException
{
File devNull;
if(Os.isFamily("unix")) {
devNull = new File("/dev/null");
}
else if (Os.isFamily("windows")) {
devNull = new File("NUL");
}
else {
throw new IllegalStateException("Unhandled Java environment");
}
exec(cmd, devNull, false, devNull, false);
}
/**
* Execute a command (and its args, ala Runtime.exec)
*
* @param cmd The command and args.
* @param outFile File to send standard out from the process to
* @param appendOut If true, append the file with standard out,
* else truncate or create a new file
* @param errFile File to send standard err from the process to
* @param appendErr If true, append the file with standard error,
* else truncate or create a new file
*
* @throws IOException Any.
*/
public static void exec(String[] cmd,
File outFile, boolean appendOut,
File errFile, boolean appendErr)
throws IOException
{
if(Os.isFamily("unix")) {
execUnix(cmd, outFile, appendOut, errFile, appendErr);
}
else if (Os.isFamily("windows")) {
execWin(cmd, outFile, appendOut, errFile, appendErr);
}
else {
throw new IllegalStateException("Unhandled Java environment");
}
}
private static void execUnix(String[] cmd,
File outFile, boolean appendOut,
File errFile, boolean appendErr)
throws IOException
{
StringBuffer escaped;
String[] execCmd;
escaped = new StringBuffer();
for(int i=0; i>" : ">") +
Escape.escape(outFile.getAbsolutePath()) +
" 2" + (appendErr == true ? ">>" : " >") +
Escape.escape(errFile.getAbsolutePath()) +
" tmpCmd = new ArrayList();
tmpCmd.add("cmd");
tmpCmd.add("/c");
tmpCmd.add("start");
tmpCmd.add("/b");
tmpCmd.add("\"\"");
tmpCmd.add("/MIN");
for(int i=0; i>" : ">") +
Escape.escape(outFile.getAbsolutePath()));
tmpCmd.add((outFile.equals(errFile) ? " 2&" : " 2") +
(appendErr == true ? ">>" : " >") +
Escape.escape(errFile.getAbsolutePath()));
Runtime.getRuntime().exec(tmpCmd.toArray(cmd));
}
public static void main(String[] args) throws Exception {
Background.exec(new String[] {"javaq", "foo bar", "bar" },
new File("garfo"), true, new File("barfo"), true);
}
}
