/*
* Copyright 2013 Cloud4SOA, www.cloud4soa.eu
*
* 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.
*/
/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
package utils;
import java.io.BufferedReader;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
/**
* Usage of following class can go as ...
* <P><PRE><CODE>
* SysCommandExecutor cmdExecutor = new SysCommandExecutor();
* cmdExecutor.setOutputLogDevice(new LogDevice());
* cmdExecutor.setErrorLogDevice(new LogDevice());
* int exitStatus = cmdExecutor.runCommand(commandLine);
* </CODE></PRE></P>
*
* OR
*
* <P><PRE><CODE>
* SysCommandExecutor cmdExecutor = new SysCommandExecutor();
* int exitStatus = cmdExecutor.runCommand(commandLine);
*
* String cmdError = cmdExecutor.getCommandError();
* String cmdOutput = cmdExecutor.getCommandOutput();
* </CODE></PRE></P>
*/
public class SysCommandExecutor
{
private ILogDevice fOuputLogDevice = null;
private ILogDevice fErrorLogDevice = null;
private String fWorkingDirectory = null;
private List fEnvironmentVarList = null;
private StringBuffer fCmdOutput = null;
private StringBuffer fCmdError = null;
private AsyncStreamReader fCmdOutputThread = null;
private AsyncStreamReader fCmdErrorThread = null;
public void setOutputLogDevice(ILogDevice logDevice)
{
fOuputLogDevice = logDevice;
}
public void setErrorLogDevice(ILogDevice logDevice)
{
fErrorLogDevice = logDevice;
}
public void setWorkingDirectory(String workingDirectory) {
fWorkingDirectory = workingDirectory;
}
public void setEnvironmentVar(String name, String value)
{
if( fEnvironmentVarList == null )
fEnvironmentVarList = new ArrayList();
fEnvironmentVarList.add(new EnvironmentVar(name, value));
}
public String getCommandOutput() {
return fCmdOutput.toString();
}
public String getCommandError() {
return fCmdError.toString();
}
public int runCommand(String commandLine) throws Exception
{
/* run command */
Process process = runCommandHelper(commandLine);
/* start output and error read threads */
startOutputAndErrorReadThreads(process.getInputStream(), process.getErrorStream());
/* wait for command execution to terminate */
int exitStatus = -1;
try {
exitStatus = process.waitFor();
} catch (Throwable ex) {
throw new Exception(ex.getMessage());
} finally {
/* notify output and error read threads to stop reading */
notifyOutputAndErrorReadThreadsToStopReading();
}
return exitStatus;
}
private Process runCommandHelper(String commandLine) throws IOException
{
Process process = null;
if( fWorkingDirectory == null )
process = Runtime.getRuntime().exec(commandLine, getEnvTokens());
else
process = Runtime.getRuntime().exec(commandLine, getEnvTokens(), new File(fWorkingDirectory));
return process;
}
private void startOutputAndErrorReadThreads(InputStream processOut, InputStream processErr)
{
fCmdOutput = new StringBuffer();
fCmdOutputThread = new AsyncStreamReader(processOut, fCmdOutput, fOuputLogDevice, "OUTPUT");
fCmdOutputThread.start();
fCmdError = new StringBuffer();
fCmdErrorThread = new AsyncStreamReader(processErr, fCmdError, fErrorLogDevice, "ERROR");
fCmdErrorThread.start();
}
private void notifyOutputAndErrorReadThreadsToStopReading()
{
fCmdOutputThread.stopReading();
fCmdErrorThread.stopReading();
}
private String[] getEnvTokens()
{
if( fEnvironmentVarList == null )
return null;
String[] envTokenArray = new String[fEnvironmentVarList.size()];
Iterator envVarIter = fEnvironmentVarList.iterator();
int nEnvVarIndex = 0;
while (envVarIter.hasNext() == true)
{
EnvironmentVar envVar = (EnvironmentVar)(envVarIter.next());
String envVarToken = envVar.fName + "=" + envVar.fValue;
envTokenArray[nEnvVarIndex++] = envVarToken;
}
return envTokenArray;
}
}
class AsyncStreamReader extends Thread
{
private StringBuffer fBuffer = null;
private InputStream fInputStream = null;
private String fThreadId = null;
private boolean fStop = false;
private ILogDevice fLogDevice = null;
private String fNewLine = null;
public AsyncStreamReader(InputStream inputStream, StringBuffer buffer, ILogDevice logDevice, String threadId)
{
fInputStream = inputStream;
fBuffer = buffer;
fThreadId = threadId;
fLogDevice = logDevice;
fNewLine = System.getProperty("line.separator");
}
public String getBuffer() {
return fBuffer.toString();
}
public void run()
{
try {
readCommandOutput();
} catch (Exception ex) {
//ex.printStackTrace(); //DEBUG
}
}
private void readCommandOutput() throws IOException
{
BufferedReader bufOut = new BufferedReader(new InputStreamReader(fInputStream));
String line = null;
while ( (fStop == false) && ((line = bufOut.readLine()) != null) )
{
fBuffer.append(line + fNewLine);
printToDisplayDevice(line);
}
bufOut.close();
//printToConsole("END OF: " + fThreadId); //DEBUG
}
public void stopReading() {
fStop = true;
}
private void printToDisplayDevice(String line)
{
if( fLogDevice != null )
fLogDevice.log(line);
else
{
//printToConsole(line);//DEBUG
}
}
private synchronized void printToConsole(String line) {
System.out.println(line);
}
}
class EnvironmentVar
{
public String fName = null;
public String fValue = null;
public EnvironmentVar(String name, String value)
{
fName = name;
fValue = value;
}
}
interface ILogDevice
{
public void log(String str);
}