blob: a6877581cc01dc682f30891da118b6745c2556f9 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
|
/*******************************************************************************
* Copyright (c) 2008 Oracle. All rights reserved.
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v1.0, which accompanies this distribution
* and is available at http://www.eclipse.org/legal/epl-v10.html.
*
* Contributors:
* Oracle - initial API and implementation
******************************************************************************/
package org.eclipse.jpt.core.internal;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.jobs.Job;
import org.eclipse.jpt.core.JpaProject;
import org.eclipse.jpt.utility.internal.StringTools;
import org.eclipse.osgi.util.NLS;
/**
* This updater will "update" the project in a job that executes in a separate
* thread and allows calls to #update() to return immediately.
*/
public class AsynchronousJpaProjectUpdater implements JpaProject.Updater {
protected final UpdateJob job;
public AsynchronousJpaProjectUpdater(JpaProject jpaProject) {
super();
this.job = this.buildJob(jpaProject);
}
protected UpdateJob buildJob(JpaProject jpaProject) {
return new UpdateJob(jpaProject);
}
/**
* Allow the job to be scheduled, but delay the first "update" until requested.
*/
public void start() {
this.job.start();
}
/**
* Let the job run to completion (i.e. do not cancel it).
* This should reduce the number of times the job is re-scheduled.
*/
public void update() {
this.job.schedule();
}
public void dispose() {
this.job.dispose();
}
@Override
public String toString() {
return StringTools.buildToStringFor(this, this.job);
}
/**
* This is the job that gets scheduled by the asynchronous updater.
* When the job is run it tells the JPA project to "update".
* Only a single instance of this job per project can run at a time.
*/
protected static class UpdateJob extends Job {
protected final JpaProject jpaProject;
/**
* When this flag is set to false, the job does not stop immediately;
* but it cannot be scheduled to run again.
*/
protected boolean shouldSchedule;
protected UpdateJob(JpaProject jpaProject) {
super(buildName(jpaProject));
this.jpaProject = jpaProject;
this.shouldSchedule = false;
this.setRule(jpaProject.getProject());
}
@Override
protected IStatus run(IProgressMonitor monitor) {
return this.jpaProject.update(monitor);
}
@Override
public boolean shouldSchedule() {
return this.shouldSchedule;
}
protected void start() {
if (this.shouldSchedule) {
throw new IllegalStateException("The Updater was not stopped."); //$NON-NLS-1$
}
this.shouldSchedule = true;
}
/**
* Prevent the job from running again and wait for the current
* execution, if there is any, to end before returning.
*/
protected void dispose() {
// this will prevent the job from being scheduled to run again
this.shouldSchedule = false;
// this will cancel the job if it has already been scheduled, but is currently WAITING
this.cancel();
try {
// if the job is currently RUNNING, wait until it is done before returning
this.join();
} catch (InterruptedException ex) {
// the job thread was interrupted while waiting - ignore
}
}
protected static String buildName(JpaProject jpaProject) {
return NLS.bind(JptCoreMessages.UPDATE_JOB_NAME, jpaProject.getName());
}
}
}
|
