4 * Copyright 2006,2007 Martin Quinson, Malek Cherier
7 * This program is free software; you can redistribute
8 * it and/or modify it under the terms of the license
9 *(GNU LGPL) which comes with this package.
12 package org.simgrid.msg;
14 import java.util.Arrays;
15 import java.util.Hashtable;
16 import java.util.Vector;
17 import java.lang.Runnable;
18 import java.util.concurrent.Semaphore;
21 * A process may be defined as a code, with some private data, executing
22 * in a location (host). All the process used by your simulation must be
23 * declared in the deployment file (XML format).
24 * To create your own process you must inherit your own process from this
25 * class and override the method "main()". For example if you want to use
26 * a process named Slave proceed as it :
28 * (1) import the class Process of the package simgrid.msg
29 * import simgrid.msg.Process;
31 * public class Slave extends simgrid.msg.Process {
33 * (2) Override the method function
36 * public void main(String[] args) {
37 * System.out.println("Hello MSG");
41 * The name of your process must be declared in the deployment file of your simulation.
42 * For the example, for the previous process Slave this file must contains a line :
43 * <process host="Maxims" function="Slave"/>, where Maxims is the host of the process
44 * Slave. All the process of your simulation are automatically launched and managed by Msg.
45 * A process use tasks to simulate communications or computations with another process.
46 * For more information see Task. For more information on host concept
51 public abstract class Process implements Runnable {
53 * This attribute represents a bind between a java process object and
54 * a native process. Even if this attribute is public you must never
55 * access to it. It is set automatically during the build of the object.
60 * Even if this attribute is public you must never access to it.
61 * It is used to compute the id of an MSG process.
63 public static long nextProcessId = 0;
66 * Even if this attribute is public you must never access to it.
67 * It is compute automatically during the creation of the object.
68 * The native functions use this identifier to synchronize the process.
72 public Hashtable<String,String> properties;
75 * The name of the process.
77 protected String name;
79 * The PID of the process
81 protected int pid = -1;
83 * The PPID of the process
85 protected int ppid = -1;
87 * The host of the process
89 protected Host host = null;
91 /** The arguments of the method function of the process. */
92 public Vector<String> args;
94 /* process synchronization tools */
96 private boolean nativeStop = false;
99 * Default constructor (used in ApplicationHandler to initialize it)
101 protected Process() {
102 this.id = nextProcessId++;
105 this.args = new Vector<String>();
106 this.properties = null;
111 * Constructs a new process from the name of a host and his name. The method
112 * function of the process doesn't have argument.
114 * @param hostname The name of the host of the process to create.
115 * @param name The name of the process.
117 * @exception HostNotFoundException if no host with this name exists.
121 public Process(String hostname, String name) throws HostNotFoundException {
122 this(Host.getByName(hostname), name, null);
125 * Constructs a new process from the name of a host and his name. The arguments
126 * of the method function of the process are specified by the parameter args.
128 * @param hostname The name of the host of the process to create.
129 * @param name The name of the process.
130 * @param args The arguments of the main function of the process.
132 * @exception HostNotFoundException if no host with this name exists.
134 * @throws NativeException
137 public Process(String hostname, String name, String args[]) throws HostNotFoundException, NativeException {
138 this(Host.getByName(hostname), name, args);
141 * Constructs a new process from a host and his name. The method function of the
142 * process doesn't have argument.
144 * @param host The host of the process to create.
145 * @param name The name of the process.
148 public Process(Host host, String name) {
149 this(host, name, null);
152 * Constructs a new process from a host and his name, the arguments of here method function are
153 * specified by the parameter args.
155 * @param host The host of the process to create.
156 * @param name The name of the process.
157 * @param args The arguments of main method of the process.
160 public Process(Host host, String name, String[]args) {
161 /* This is the constructor called by all others */
165 throw new NullPointerException("Process name cannot be NULL");
168 this.args = new Vector<String>();
170 this.args.addAll(Arrays.asList(args));
172 this.properties = new Hashtable<String,String>();
176 * The natively implemented method to create an MSG process.
177 * @param host A valid (binded) host where create the process.
179 protected native void create(String hostName) throws HostNotFoundException;
181 * This method kills all running process of the simulation.
183 * @param resetPID Should we reset the PID numbers. A negative number means no reset
184 * and a positive number will be used to set the PID of the next newly
187 * @return The function returns the PID of the next created process.
190 public static native int killAll(int resetPID);
192 * This method sets a flag to indicate that this thread must be killed. End user must use static method kill
197 public void nativeStop() {
201 * getter for the flag that indicates that this thread must be killed
206 public boolean getNativeStop() {
211 * This method kill a process.
212 * @param process the process to be killed.
217 Msg.info("Process " + msgName() + " will be killed.");
221 * Suspends the process by suspending the task on which it was
222 * waiting for the completion.
225 public native void pause();
227 * Resumes a suspended process by resuming the task on which it was
228 * waiting for the completion.
232 public native void restart();
234 * Tests if a process is suspended.
236 * @return The method returns true if the process is suspended.
237 * Otherwise the method returns false.
239 public native boolean isSuspended();
241 * Returns the name of the process
243 public String msgName() {
247 * Returns the host of the process.
248 * @return The host instance of the process.
250 public Host getHost() {
254 * This static method gets a process from a PID.
256 * @param PID The process identifier of the process to get.
258 * @return The process with the specified PID.
260 * @exception NativeException on error in the native SimGrid code
262 public static native Process fromPID(int PID) throws NativeException;
264 * This method returns the PID of the process.
266 * @return The PID of the process.
269 public int getPID() {
273 * This method returns the PID of the parent of a process.
275 * @return The PID of the parent of the process.
278 public int getPPID() {
282 * This static method returns the currently running process.
284 * @return The current process.
287 public static native Process currentProcess();
289 * Kills a MSG process
290 * @param process Valid java process to kill
292 final static native void kill(Process process);
294 * Migrates a process to another host.
296 * @param process The process to migrate.
297 * @param host The host where to migrate the process.
300 public native static void migrate(Process process, Host host);
302 * Makes the current process sleep until millis millisecondes have elapsed.
303 * You should note that unlike "waitFor" which takes seconds, this method takes milliseconds.
304 * FIXME: Not optimal, maybe we should have two native functions.
305 * @param millis the length of time to sleep in milliseconds.
307 public static void sleep(long millis) {
311 * Makes the current process sleep until millis milliseconds and nanos nanoseconds
313 * You should note that unlike "waitFor" which takes seconds, this method takes milliseconds and nanoseconds.
314 * Overloads Thread.sleep.
315 * @param millis the length of time to sleep in milliseconds.
316 * @param nanos additionnal nanoseconds to sleep.
318 public native static void sleep(long millis, int nanos);
320 * Makes the current process sleep until time seconds have elapsed.
321 * @param seconds The time the current process must sleep.
323 public native void waitFor(double seconds);
327 public void showArgs() {
328 Msg.info("[" + this.name + "/" + this.getHost().getName() + "] argc=" +
330 for (int i = 0; i < this.args.size(); i++)
331 Msg.info("[" + this.msgName() + "/" + this.getHost().getName() +
332 "] args[" + i + "]=" + (String) (this.args.get(i)));
335 * This method actually creates and run the process.
336 * @throws HostNotFoundException
338 public void start() throws HostNotFoundException {
339 create(host.getName());
343 * This method runs the process. Il calls the method function that you must overwrite.
347 String[] args = null; /* do not fill it before the signal or this.args will be empty */
348 //waitSignal(); /* wait for other people to fill the process in */
351 args = new String[this.args.size()];
352 if (this.args.size() > 0) {
353 this.args.toArray(args);
357 } catch(MsgException e) {
359 Msg.info("Unexpected behavior. Stopping now");
362 catch(ProcessKilled pk) {
367 pk.printStackTrace();
368 Msg.info("Unexpected behavior. Stopping now");
375 * The main function of the process (to implement).
378 * @throws MsgException
380 public abstract void main(String[]args) throws MsgException;
384 * Class initializer, to initialize various JNI stuff
386 public static native void nativeInit();