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comparison dwtx/core/internal/jobs/JobOSGiUtils.d @ 122:9d0585bcb7aa

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Add core.jobs package
author Frank Benoit <benoit@tionex.de>
date Tue, 12 Aug 2008 02:34:21 +0200
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121:c0304616ea23 122:9d0585bcb7aa
1 /*******************************************************************************
2 * Copyright (c) 2005, 2007 IBM Corporation and others.
3 * All rights reserved. This program and the accompanying materials
4 * are made available under the terms of the Eclipse Public License v1.0
5 * which accompanies this distribution, and is available at
6 * http://www.eclipse.org/legal/epl-v10.html
7 *
8 * Contributors:
9 * IBM Corporation - initial API and implementation
10 * Port to the D programming language:
11 * Frank Benoit <benoit@tionex.de>
12 *******************************************************************************/
13 module dwtx.core.internal.jobs.JobOSGiUtils;
14
15 import dwt.dwthelper.utils;
16
17 // import org.osgi.framework.Bundle;
18 // import org.osgi.framework.BundleContext;
19 // import org.osgi.service.packageadmin.PackageAdmin;
20 // import org.osgi.util.tracker.ServiceTracker;
21
22 import dwtx.core.runtime.jobs.IJobManager;
23 // import dwtx.osgi.service.debug.DebugOptions;
24
25 /**
26 * The class contains a set of helper methods for the runtime Jobs plugin.
27 * The following utility methods are supplied:
28 * - provides access to debug options
29 * - provides some bundle discovery functionality
30 *
31 * The closeServices() method should be called before the plugin is stopped.
32 *
33 * @since dwtx.core.jobs 3.2
34 */
35 class JobOSGiUtils {
36 // private ServiceTracker debugTracker = null;
37 // private ServiceTracker bundleTracker = null;
38
39 private static /+final+/ JobOSGiUtils singleton;
40
41 /**
42 * Accessor for the singleton instance
43 * @return The JobOSGiUtils instance
44 */
45 public static synchronized JobOSGiUtils getDefault() {
46 if( singleton is null ){
47 singleton = new JobOSGiUtils();
48 }
49 return singleton;
50 }
51
52 /**
53 * Private constructor to block instance creation.
54 */
55 private this() {
56 // super();
57 }
58
59 void openServices() {
60 implMissing(__FILE__,__LINE__);
61 // BundleContext context = JobActivator.getContext();
62 // if (context is null) {
63 // if (JobManager.DEBUG)
64 // JobMessages.message("JobsOSGiUtils called before plugin started"); //$NON-NLS-1$
65 // return;
66 // }
67 //
68 // debugTracker = new ServiceTracker(context, DebugOptions.class.getName(), null);
69 // debugTracker.open();
70 //
71 // bundleTracker = new ServiceTracker(context, PackageAdmin.class.getName(), null);
72 // bundleTracker.open();
73 }
74
75 void closeServices() {
76 implMissing(__FILE__,__LINE__);
77 // if (debugTracker !is null) {
78 // debugTracker.close();
79 // debugTracker = null;
80 // }
81 // if (bundleTracker !is null) {
82 // bundleTracker.close();
83 // bundleTracker = null;
84 // }
85 }
86
87 public bool getBooleanDebugOption(String option, bool defaultValue) {
88 implMissing(__FILE__,__LINE__);
89 return false;
90 // if (debugTracker is null) {
91 // if (JobManager.DEBUG)
92 // JobMessages.message("Debug tracker is not set"); //$NON-NLS-1$
93 // return defaultValue;
94 // }
95 // DebugOptions options = (DebugOptions) debugTracker.getService();
96 // if (options !is null) {
97 // String value = options.getOption(option);
98 // if (value !is null)
99 // return value.equalsIgnoreCase("true"); //$NON-NLS-1$
100 // }
101 // return defaultValue;
102 }
103
104 /**
105 * Returns the bundle id of the bundle that contains the provided object, or
106 * <code>null</code> if the bundle could not be determined.
107 */
108 public String getBundleId(Object object) {
109 implMissing(__FILE__,__LINE__);
110 // if (bundleTracker is null) {
111 // if (JobManager.DEBUG)
112 // JobMessages.message("Bundle tracker is not set"); //$NON-NLS-1$
113 // return null;
114 // }
115 // PackageAdmin packageAdmin = (PackageAdmin) bundleTracker.getService();
116 // if (object is null)
117 // return null;
118 // if (packageAdmin is null)
119 // return null;
120 // Bundle source = packageAdmin.getBundle(object.getClass());
121 // if (source !is null && source.getSymbolicName() !is null)
122 // return source.getSymbolicName();
123 return null;
124 }
125
126 /**
127 * Calculates whether the job plugin should set worker threads to be daemon
128 * threads. When workers are daemon threads, the job plugin does not need
129 * to be explicitly shut down because the VM can exit while workers are still
130 * alive.
131 * @return <code>true</code> if all worker threads should be daemon threads,
132 * and <code>false</code> otherwise.
133 */
134 bool useDaemonThreads() {
135 implMissing(__FILE__,__LINE__);
136 return false;
137 // BundleContext context = JobActivator.getContext();
138 // if (context is null) {
139 // //we are running stand-alone, so consult global system property
140 // String value = System.getProperty(IJobManager.PROP_USE_DAEMON_THREADS);
141 // //default to use daemon threads if property is absent
142 // if (value is null)
143 // return true;
144 // return "true".equalsIgnoreCase(value); //$NON-NLS-1$
145 // }
146 // //only use daemon threads if the property is defined
147 // final String value = context.getProperty(IJobManager.PROP_USE_DAEMON_THREADS);
148 // //if value is absent, don't use daemon threads to maintain legacy behaviour
149 // if (value is null)
150 // return false;
151 // return "true".equalsIgnoreCase(value); //$NON-NLS-1$
152 }
153 }