2 * simgrid.msg.Task.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.
12 package org.simgrid.msg;
15 * A task is either something to compute somewhere, or something to exchange between two hosts (or both).
16 * It is defined by a computing amount and a message size.
21 * This attribute represents a bind between a java task object and
22 * a native task. Even if this attribute is public you must never
23 * access to it. It is set automatically during the build of the object.
28 /** Default constructor (all fields to 0 or null) */
30 MsgNative.taskCreate(this, null, 0, 0);
36 * Construct an new task with the specified processing amount and amount
39 * @param name Task's name
41 * @param computeDuration A value of the processing amount (in flop) needed to process the task.
42 * If 0, then it cannot be executed with the execute() method.
43 * This value has to be >= 0.
45 * @param messageSize A value of amount of data (in bytes) needed to transfert this task.
46 * If 0, then it cannot be transfered with the get() and put() methods.
47 * This value has to be >= 0.
49 public Task(String name, double computeDuration, double messageSize) {
50 MsgNative.taskCreate(this, name, computeDuration, messageSize);
53 * Construct an new parallel task with the specified processing amount and amount for each host
56 * @param name The name of the parallel task.
57 * @param hosts The list of hosts implied by the parallel task.
58 * @param computeDurations The amount of operations to be performed by each host of \a hosts.
59 * @param messageSizes A matrix describing the amount of data to exchange between hosts.
61 public Task(String name, Host[]hosts, double[]computeDurations, double[]messageSizes) {
62 MsgNative.parallelTaskCreate(this, name, hosts, computeDurations, messageSizes);
65 * * Getters / Setters * *
67 /** Gets the name of a task
70 public String getName() {
71 return MsgNative.taskGetName(this);
73 /** Gets the sender of the task */
75 return MsgNative.taskGetSender(this);
77 /** Gets the source of the task
80 public Host getSource() {
81 return MsgNative.taskGetSource(this);
83 /** Gets the computing amount of the task
86 public double getComputeDuration() {
87 return MsgNative.taskGetComputeDuration(this);
89 /** Gets the remaining computation of the task
92 public double getRemainingDuration() {
93 return MsgNative.taskGetRemainingDuration(this);
96 * This method sets the priority of the computation of the task.
97 * The priority doesn't affect the transfer rate. For example a
98 * priority of 2 will make the task receive two times more cpu than
101 * @param priority The new priority of the task.
103 public void setPriority(double priority) {
104 MsgNative.taskSetPriority(this, priority);
107 * * Communication-related * *
112 * * Computation-related * *
115 * Executes a task on the location on which the process is running.
118 * @throws HostFailureException
119 * @throws TaskCancelledException
121 public void execute() throws HostFailureException,TaskCancelledException {
122 MsgNative.taskExecute(this);
128 public void cancel() {
129 MsgNative.taskCancel(this);
133 * @exception NativeException if the destruction failed.
135 protected void finalize() throws NativeException {
137 MsgNative.taskDestroy(this);
140 /** Send the task asynchronously on the mailbox identified by the specified name,
141 * with no way to retrieve whether the communication succeeded or not
144 public void dsend(String mailbox) {
145 MsgNative.taskDSend(mailbox, this);
149 * Sends the task on the mailbox identified by the specified name
152 * @throws TimeoutException
153 * @throws HostFailureException
154 * @throws TransferFailureException
156 public void send(String mailbox) throws TransferFailureException, HostFailureException, TimeoutException {
157 MsgNative.taskSend(mailbox, this, -1);
161 * Sends the task on the mailbox identified by the specified name (wait at most \a timeout seconds)
165 * @exception NativeException if the retrieval fails.
166 * @throws TimeoutException
167 * @throws HostFailureException
168 * @throws TransferFailureException
170 public void send(String mailbox, double timeout) throws NativeException, TransferFailureException, HostFailureException, TimeoutException {
171 MsgNative.taskSend(mailbox, this, timeout);
175 * Sends the task on the mailbox identified by the specified alias (capping the sending rate to \a maxrate)
179 * @throws TransferFailureException
180 * @throws HostFailureException
181 * @throws TimeoutException
183 public void sendBounded(String alias, double maxrate) throws TransferFailureException, HostFailureException, TimeoutException {
184 MsgNative.taskSendBounded(alias, this, maxrate);
188 * Retrieves next task from the mailbox identified by the specified name
192 * @throws TransferFailureException
193 * @throws HostFailureException
194 * @throws TimeoutException
197 public static Task receive(String mailbox) throws TransferFailureException, HostFailureException, TimeoutException {
198 return MsgNative.taskReceive(mailbox, -1.0, null);
202 * Retrieves next task on the mailbox identified by the specified name (wait at most \a timeout seconds)
207 * @throws TransferFailureException
208 * @throws HostFailureException
209 * @throws TimeoutException
211 public static Task receive(String mailbox, double timeout) throws TransferFailureException, HostFailureException, TimeoutException {
212 return MsgNative.taskReceive(mailbox, timeout, null);
216 * Retrieves next task sent by a given host on the mailbox identified by the specified alias
221 * @throws TransferFailureException
222 * @throws TimeoutException
223 * @throws HostFailureException
226 public static Task receive(String mailbox, Host host) throws TransferFailureException, HostFailureException, TimeoutException {
227 return MsgNative.taskReceive(mailbox, -1.0, host);
231 * Retrieves next task sent by a given host on the mailbox identified by the specified alias (wait at most \a timeout seconds)
237 * @throws TransferFailureException
238 * @throws HostFailureException
239 * @throws TimeoutException
241 public static Task receive(String mailbox, double timeout, Host host) throws TransferFailureException, HostFailureException, TimeoutException {
242 return MsgNative.taskReceive(mailbox, timeout, host);
246 * Tests whether there is a pending communication on the mailbox identified by the specified alias, and who sent it
252 public static int listenFrom(String mailbox) {
253 return MsgNative.taskListenFrom(mailbox);
256 * Listen whether there is a waiting task on the mailbox identified by the specified alias
262 public static boolean listen(String mailbox) {
263 return MsgNative.taskListen(mailbox);
267 * Counts the number of tasks waiting to be received on the \a mailbox identified by the specified alia and sended by the specified \a host.
274 public static int listenFromHost(String alias, Host host) {
275 return MsgNative.taskListenFromHost(alias, host);