From: gumartinm <gu.martinm@gmail.com>
Date: Sun, 29 Jan 2012 01:24:17 +0000 (+0100)
Subject: Working on Java TCP fork.
X-Git-Url: https://git.gumartinm.name/?a=commitdiff_plain;h=f96875ea169c9348ba847e5f46e505e58bce7ea0;p=JavaForFun

Working on Java TCP fork.
It is being harder than I thought...
---

diff --git a/JavaFork/JavaExample/javafork-example/src/main/java/de/fork/java/LauncherProcesses.java b/JavaFork/JavaExample/javafork-example/src/main/java/de/fork/java/LauncherProcesses.java
new file mode 100644
index 0000000..dfb7d14
--- /dev/null
+++ b/JavaFork/JavaExample/javafork-example/src/main/java/de/fork/java/LauncherProcesses.java
@@ -0,0 +1,285 @@
+package de.fork.java;
+
+import java.io.ByteArrayInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.PrintStream;
+import java.net.UnknownHostException;
+import javax.xml.parsers.ParserConfigurationException;
+import org.apache.log4j.Logger;
+import org.xml.sax.SAXException;
+
+/**
+ * 
+ */
+public class LauncherProcesses {
+	// Exit process status
+	private static final int STATUS_ERR = -1;
+	private static final int DEFAULT_PORT = 5193;
+	private static final String DEFAULT_HOST = "127.0.0.1";
+	
+	/**
+	 * Run a process.
+	 * 
+	 * @param command system command to be executed.
+	 * 
+	 * @return return code.
+	 */
+	public static int exec(final String command) throws IOException, InterruptedException {
+
+		return exec(command, null, null);
+	}
+
+	/**
+	 * Run a process.
+	 * 
+	 * @param command system command to execute.
+	 * @param standarOutPut if not null, the standard output is redirected to this parameter.
+	 *            
+	 * @return return code.            
+	 */
+	public static int exec(final String command, final PrintStream standarOutPut) throws IOException, InterruptedException {
+
+		return exec(command, standarOutPut, null);
+	}
+
+	
+	/**
+	 * Run a process.
+	 * 
+	 * @param command system command to be executed.
+	 * @param standarOutPut if not null, the standard output is redirected to this parameter.
+	 * @param errorOutPut if not null, the error output is redirected to this parameter.
+	 * 
+	 * @return return code from the executed system command.     
+	 */
+	public static int exec(final String command, final PrintStream standarOutPut, final PrintStream errorOutPut) throws IOException, InterruptedException {
+
+		return exec(command, standarOutPut, errorOutPut, DEFAULT_HOST, DEFAULT_PORT);
+	}
+
+	/**
+	 * Run a process.
+	 * 
+	 * @param command system command to be executed.
+	 * @param aLogger send the information to log.
+	 */
+	public static int exec(final String command, final Logger aLogger) throws IOException, InterruptedException {
+
+		//calling private method to handle logger input/ouput in a common method
+		return execHandlingLogger(command, aLogger, DEFAULT_HOST, DEFAULT_PORT);
+	}
+	
+	
+	/**
+	 * Run process.
+	 * 
+	 * @param commandAndArguments String array containing system command and its 
+	 * arguments to be executed.<br>
+	 * <b>For example:</b> 
+	 * <pre>
+	 * commandAndArguments[0]="ls";
+	 * commandAndArguments[1]="-lr";
+	 * </pre>
+	 * @param aLogger
+	 * 
+	 * @return return code from the executed system command.
+	 * 
+	 * @throws IOException
+	 * @throws InterruptedException
+	 */
+	public static int exec(final String[] commandAndArguments, final Logger aLogger) throws IOException, InterruptedException {
+		String wholeCommand="";
+		
+		for(String argument : commandAndArguments) {
+			wholeCommand = wholeCommand + " " + argument;
+		}
+		
+		//calling private method to handle logger input/ouput in a common method
+		return execHandlingLogger(wholeCommand, aLogger, DEFAULT_HOST, DEFAULT_PORT);
+	}
+	
+	
+	/**
+	 * Run process using a remote process runner.
+	 * 
+	 * @param command system command to be executed.
+	 * @param standarOutPut the stdout stream from that command as a <code>PrintStream</code>
+	 * @param errorOutPut the stderr stream from that command as a <code>PrintStream</code>
+	 * @param host the specified host.
+	 * @param port the where the remote process runner accepts connections.
+	 * 
+	 * <p> The host name can either be a machine name, such as
+     * "<code>java.sun.com</code>", or a textual representation of its
+     * IP address. If a literal IP address is supplied, only the
+     * validity of the address format is checked.
+     * </p>
+     * <p> For <code>host</code> specified in literal IPv6 address,
+     * either the form defined in RFC 2732 or the literal IPv6 address
+     * format defined in RFC 2373 is accepted. IPv6 scoped addresses are also
+     * supported. See <a href="Inet6Address.html#scoped">here</a> for a description of IPv6
+     * scoped addresses.
+	 * </p>
+	 * 
+	 * @return the executed command's return code.
+	 * 
+	 * @throws UnknownHostException
+	 * @throws IOException
+	 */
+	public static int exec(final String command, final PrintStream standarOutPut, 
+			final PrintStream errorOutPut, final String host, final int port) 
+											throws IOException, InterruptedException {
+		int exitStatus = LauncherProcesses.STATUS_ERR;
+		XmlForkParser forkParser = null;
+		TCPForkDaemon process = null;
+		
+		try {
+			forkParser = new XmlForkParser();
+			process = new TCPForkDaemon(forkParser, host, port);
+			exitStatus = process.exec(command);
+		} catch (ParserConfigurationException e) {
+			// This is not a crazy thing, we are trying to insert this new method without
+			// breaking the old methods which did not throw SAXException or ParserConfigurationException
+			// Do not blame me.
+			throw new IOException(e);
+		} catch (SAXException e) {
+			// This is not a crazy thing, we are trying to insert this new method without
+			// breaking the old methods which did not throw SAXException or ParserConfigurationException
+			// Do not blame me.
+			throw new IOException(e);
+		}	
+		
+
+		
+		if ((standarOutPut != null) && (process.getStdout() != null)){
+			standarOutPut.println(process.getStdout());
+		}
+
+		if ((errorOutPut != null) && (process.getStderr() != null)){
+			errorOutPut.println(process.getStderr());
+		}
+
+		return exitStatus;
+	}
+	
+	
+	/**
+	 * Run process.
+	 * 
+	 * @param command system command to be executed.
+	 * @param aLogger
+	 * @param host the specified host.
+	 * @param port the TCP port where the daemon accepts connections.
+	 * 
+	 * @return the executed command's return code.
+	 * 
+	 * @throws IOException
+	 * @throws InterruptedException
+	 */
+	private static int execHandlingLogger(final String command, final Logger aLogger, 
+				final String host, int port) throws IOException, InterruptedException {
+		int exitStatus = LauncherProcesses.STATUS_ERR;
+		XmlForkParser forkParser = null;
+		TCPForkDaemon process = null;
+		
+		try {
+			forkParser = new XmlForkParser();
+			process = new TCPForkDaemon(forkParser, host, port);
+			exitStatus = process.exec(command);
+		} catch (ParserConfigurationException e) {
+			// This is not a crazy thing, we are trying to insert this new method without
+			// breaking the old methods which did not throw SAXException or ParserConfigurationException
+			// Do not blame me.
+			throw new IOException(e);
+		} catch (SAXException e) {
+			// This is not a crazy thing, we are trying to insert this new method without
+			// breaking the old methods which did not throw SAXException or ParserConfigurationException
+			// Do not blame me.
+			throw new IOException(e);
+		}
+		
+
+		
+		if (process.getStdout() != null) {
+			aLogger.info(process.getStdout());
+		}
+		if (process.getStderr() != null) {
+			aLogger.error(process.getStderr());
+		}
+
+		return exitStatus;
+	}
+	
+	
+	/**
+	 * Run process
+	 * 
+	 * @param command command and its arguments to be executed.<br>
+	 * <b>For example:</b> 
+	 * <pre>
+	 * commandAndArguments[0]="ls";
+	 * commandAndArguments[1]="-lr";
+	 * </pre>
+	 * @param aLogger send information to log
+	 * 
+	 * @return the executed command's return code.
+	 * 
+	 * @throws IOException
+	 * @throws InterruptedException
+	 */
+	public static InputStream execStream (final String [] command, final Logger aLogger) 
+													throws IOException, InterruptedException {
+		int exitStatus = LauncherProcesses.STATUS_ERR;
+		InputStream stdInput = null;
+		XmlForkParser forkParser = null;
+		TCPForkDaemon process = null;
+		String wholeCommand="";
+		
+		for(String argument : command) {
+			wholeCommand = wholeCommand + " " + argument;
+		}		
+		
+		try {
+			forkParser = new XmlForkParser();
+			process = new TCPForkDaemon(forkParser, DEFAULT_HOST, DEFAULT_PORT);
+			exitStatus = process.exec(wholeCommand);
+		} catch (ParserConfigurationException e) {
+			throw new IOException(e);
+		} catch (SAXException e) {
+			throw new IOException(e);
+		}
+
+		
+		if(exitStatus == 0) {
+			stdInput = new ByteArrayInputStream(process.getStdout().getBytes("UTF-8"));
+		}
+		else {
+			aLogger.error(process.getStderr());
+		}
+		
+
+		return stdInput;
+	}
+	
+	/**
+	 * <p>The <em>command</em> is lunched from <em>location</em>
+	 * <li>#>cd <em>location</em></li>
+	 * <li>#location> <em>command</em></li></p>
+	 * 
+	 * @param command the command to be executed by the daemon.
+	 * @param location
+	 * 
+	 * @return the executed command's return code. <br>
+	 * Usually <code>0</code> if execution is OK, otherwise <code>!=0</code> 
+	 * 
+	 * @throws IOException
+	 * @throws InterruptedException
+	 */
+	public static int execInLocation (final String command, final String location) throws IOException, InterruptedException {
+		int exitStatus = LauncherProcesses.STATUS_ERR;
+		final String wholeCommand = "cd " + location + " && " + command;
+		
+		exitStatus =  exec(wholeCommand, null, null, DEFAULT_HOST, DEFAULT_PORT);
+		return exitStatus;
+	}
+}