2 * simgrid.msg.Host.java 1.00 07/05/01
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.
14 import java.lang.Thread;
17 * A process may be defined as a code, with some private data, executing
18 * in a location (host). All the process used by your simulation must be
19 * declared in the deployment file (XML format).
20 * To create your ouwn process you must inherite your own process from this
21 * class and override the method "main()". For example if you want to use
22 * a process named Slave proceed as it :
24 * (1) import the class Process of the package simgrid.msg
25 * import simgrid.msg.Process;
27 * public class Slave extends simgrid.msg.Process {
29 * (2) Write a default constructor and
30 * call the default constructor of the base class.
36 * (3) Override the method function
37 * public void main(String[] args) {
38 * System.out.println("Hello MSG");
41 * The name of your process must be declared in the deployment file of your simulation.
42 * For the exemple, for the previouse 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 automaticaly launched and managed by Msg.
45 * A process use tasks to simulate communications or computations with another process.
46 * For more information see Task and ParallelTask. For more information on host concept
49 * @author Abdelmalek Cherier
50 * @author Martin Quinson
51 * @version 1.00, 07/05/01
59 public class Process extends Thread
62 * This attribute represents a bind between a java process object and
63 * a native process. Even if this attribute is public you must never
64 * access to it. It is set automaticatly during the build of the object.
69 * Even if this attribute is public you must never access to it.
70 * It is used to compute the id of an MSG process.
72 public static long nextProcessId = 0;
75 * Even if this attribute is public you must never access to it.
76 * It is compute automaticaly during the creation of the object.
77 * The native functions use this identifier to synchronize the process.
82 * The name of the process.
84 protected String name;
85 public String msgName() {
90 * The arguments of the method function of the process.
95 * Default constructor. (used in ApplicationHandler to initialize it)
102 this.args = new Vector();
107 * Constructs a new process from the name of a host and his name. The method
108 * function of the process doesn't have argument.
110 * @param hostName The name of the host of the process to create.
111 * @param name The name of the process.
113 * @exception HostNotFoundException if no host with this name exists.
114 * NullPointerException if the provided name is null
115 * JniException on JNI madness
118 public Process(String hostname,String name)
119 throws NullPointerException, HostNotFoundException, JniException, NativeException {
120 this(Host.getByName(hostname),name,null);
124 * Constructs a new process from the name of a host and his name. The arguments
125 * of the method function of the process are specified by the parameter args.
127 * @param hostName The name of the host of the process to create.
128 * @param name The name of the process.
129 * @param args The arguments of the main function of the process.
131 * @exception HostNotFoundException if no host with this name exists.
132 * NullPointerException if the provided name is null
133 * JniException on JNI madness
136 public Process(String hostname,String name,String args[])
137 throws NullPointerException, HostNotFoundException, JniException, NativeException {
138 this(Host.getByName(hostname),name,args);
142 * Constructs a new process from a host and his name. The method function of the
143 * process doesn't have argument.
145 * @param host The host of the process to create.
146 * @param name The name of the process.
148 * @exception NullPointerException if the provided name is null
149 * JniException on JNI madness
152 public Process(Host host,String name) throws NullPointerException, JniException {
153 this(host,name,null);
157 * Constructs a new process from a host and his name, the arguments of here method function are
158 * specified by the parameter args.
160 * @param host The host of the process to create.
161 * @param name The name of the process.
162 * @param args The arguments of main method of the process.
164 * @exception NullPointerException if the provided name is null
165 * JniException on JNI madness
168 public Process(Host host,String name,String[] args) throws NullPointerException, JniException {
169 /* This is the constructor called by all others */
172 throw new NullPointerException("Process name cannot be NULL");
174 this.args.addAll(Arrays.asList(args));
176 this.id = nextProcessId++;
178 Msg.processCreate(this,host);
182 * This method kills all running process of the simulation.
184 * @param resetPID Should we reset the PID numbers. A negative number means no reset
185 * and a positive number will be used to set the PID of the next newly
188 * @return The function returns the PID of the next created process.
191 public static int killAll(int resetPID){
192 return Msg.processKillAll(resetPID);
196 * This method adds an argument in the list of the arguments of the main function
199 * @param arg The argument to add.
201 protected void addArg(String arg) {
206 * This method suspends the process by suspending the task on which it was
207 * waiting for the completion.
209 * @exception JniException on JNI madness
210 * NativeException on error in the native SimGrid code
212 public void pause() throws JniException,NativeException {
213 Msg.processSuspend(this);
217 * This method resumes a suspended process by resuming the task on which it was
218 * waiting for the completion.
220 * @exception JniException on JNI madness
221 * NativeException on error in the native SimGrid code
224 public void restart() throws JniException,NativeException {
225 Msg.processResume(this);
229 * This method tests if a process is suspended.
231 * @return The method returns true if the process is suspended.
232 * Otherwise the method returns false.
234 * @exception JniException on JNI madness
236 public boolean isSuspended() throws JniException {
237 return Msg.processIsSuspended(this);
241 * This method returns the host of a process.
243 * @return The host instance of the process.
245 * @exception JniException on JNI madness
246 * NativeException on error in the native SimGrid code
249 public Host getHost() throws JniException,NativeException{
250 return Msg.processGetHost(this);
254 * This static method get 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 Process fromPID(int PID) throws NativeException {
263 return Msg.processFromPID(PID);
267 * This method returns the PID of the process.
269 * @return The PID of the process.
271 * @exception JniException on JNI madness
272 * NativeException on error in the native SimGrid code
274 public int getPID() throws JniException,NativeException{
275 return Msg.processGetPID(this);
279 * This method returns the PID of the parent of a process.
281 * @return The PID of the parent of the process.
283 * @exception NativeException on error in the native SimGrid code
285 public int getPPID() throws NativeException{
286 return Msg.processGetPPID(this);
290 * This static method returns the currently running process.
292 * @return The current process.
294 * @exception NativeException on error in the native SimGrid code
298 public static Process currentProcess() throws NativeException{
299 return Msg.processSelf();
303 * This static method returns the PID of the currently running process.
305 * @return The PID of the current process.
307 public static int currentProcessPID(){
308 return Msg.processSelfPID();
312 * This static method returns the PID of the parent of the currently running process.
314 * @return The PID of the parent of current process.
316 public static int currentProcessPPID(){
317 return Msg.processSelfPPID();
321 * This function migrates a process to another host.
323 * @parm host The host where to migrate the process.
325 * @exception JniException on JNI madness
326 * NativeException on error in the native SimGrid code
328 public void migrate(Host host) throws JniException, NativeException{
329 Msg.processChangeHost(this,host);
333 * This method makes the current process sleep until time seconds have elapsed.
335 * @param seconds The time the current process must sleep.
337 * @exception NativeException on error in the native SimGrid code
339 public static void waitFor(double seconds) throws NativeException {
340 Msg.processWaitFor(seconds);
344 public void showArgs(){
346 Msg.info("["+this.name+"/"+this.getHost().getName()+"] argc="+this.args.size() );
347 for(int i = 0; i < this.args.size(); i++)
348 Msg.info("["+this.msgName()+"/"+this.getHost().getName()+
349 "] args["+i+"]="+(String)(this.args.get(i)));
350 } catch (MsgException e) {
351 Msg.info("Damn JNI stuff");
357 * This method runs the process. Il calls the method function that you must overwrite.
359 public synchronized void run() {
362 String[] args; /* do not fill it before the signal or this.args will be empty */
364 waitSignal(); /* wait for other people to fill the process in */
366 args = new String[this.args.size()];
367 this.args.toArray(args);
369 Msg.info("["+this.name+"/"+this.getHost().getName()+"] Start");
371 Msg.processExit(this);
372 } catch (MsgException e) {
374 Msg.info("Unexpected behavior. Stopping now");
380 * Process synchronization. The process wait the signal of the simulator to start.
382 * @exception JniException on JNI madness
384 private void waitSignal() throws JniException{
385 Msg.waitSignal(this);
389 * The main function of the process (to override).
392 public void main(String[] args) throws MsgException {
395 // ALL DERIVED CLASS OF THIS CLASS MUST OVERRIDE THIS METHOD