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My first initial commit with all of mine experimental changes.

Dmitry Kabak (userdima committed 13 years ago

Commit d37b88d1 parent 3f5b46618352 files · +2598093 −-8690Browse files

Showing the changes to java/pkg/sun/tracing/dtrace/DTraceProviderFactory.java (1 of 18352 files). Show all

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1+/*
2+ * Copyright (c) 2008, Oracle and/or its affiliates. All rights reserved.
3+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4+ *
5+ * This code is free software; you can redistribute it and/or modify it
6+ * under the terms of the GNU General Public License version 2 only, as
7+ * published by the Free Software Foundation. Oracle designates this
8+ * particular file as subject to the "Classpath" exception as provided
9+ * by Oracle in the LICENSE file that accompanied this code.
10+ *
11+ * This code is distributed in the hope that it will be useful, but WITHOUT
12+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14+ * version 2 for more details (a copy is included in the LICENSE file that
15+ * accompanied this code).
16+ *
17+ * You should have received a copy of the GNU General Public License version
18+ * 2 along with this work; if not, write to the Free Software Foundation,
19+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20+ *
21+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22+ * or visit www.oracle.com if you need additional information or have any
23+ * questions.
24+ */
25+
26+package sun.tracing.dtrace;
27+
28+import java.util.Map;
29+import java.util.Set;
30+import java.util.HashMap;
31+import java.util.HashSet;
32+import java.security.Permission;
33+
34+import com.sun.tracing.ProviderFactory;
35+import com.sun.tracing.Provider;
36+
37+/**
38+ * Factory class to create JSDT Providers.
39+ *
40+ * This class contains methods to create an instance of a Provider
41+ * interface which can be used to place tracepoints in an application.
42+ * Method calls upon that instance trigger DTrace probes that
43+ * are visible from DTrace scripts. Such calls have no other
44+ * side effects in the application.
45+ * <p>
46+ * The DTrace script mechanisms for listing and matching probes will not see
47+ * nor match any probes until the provider they reside in is created by a
48+ * call to {@code createProvider()} (or {@code createProviders()}).
49+ * <p>
50+ * Providers that are created should be disposed of when they are no longer
51+ * needed to free up system resources, at which point the associated
52+ * DTrace probes will no longer be available to DTrace. One disposes a
53+ * provider by calling
54+ * {@link com.sun.tracing.Provider#dispose Provider.dispose()} on a
55+ * created provider instance.
56+ *
57+ * @since 1.7
58+ */
59+public final class DTraceProviderFactory extends ProviderFactory {
60+ /**
61+ * Creates an instance of a provider which can then be used to trigger
62+ * DTrace probes.
63+ *
64+ * The provider specification, provided as an argument, should only
65+ * contain methods which have a 'void' return type and String or
66+ * integer-based typed arguments (long, int, short, char, byte, or boolean).
67+ *
68+ * @param cls A user-defined interface which extends {@code Provider}.
69+ * @return An instance of the interface which is used to trigger
70+ * the DTrace probes.
71+ * @throws java.lang.SecurityException if a security manager has been
72+ * installed and it denies
73+ * RuntimePermission("com.sun.dtrace.jsdt.createProvider")
74+ * @throws java.lang.IllegalArgumentException if the interface contains
75+ * methods that do not return null, or that contain arguments that are
76+ * not String or integer types.
77+ */
78+ public <T extends Provider> T createProvider(Class<T> cls) {
79+ DTraceProvider jsdt = new DTraceProvider(cls);
80+ T proxy = jsdt.newProxyInstance();
81+ jsdt.setProxy(proxy);
82+ jsdt.init();
83+ new Activation(jsdt.getModuleName(), new DTraceProvider[] { jsdt });
84+ return proxy;
85+ }
86+
87+ /**
88+ * Creates multiple providers at once.
89+ *
90+ * This method batches together a number of provider instantiations.
91+ * It works similarly
92+ * to {@code createProvider}, but operates on a set of providers instead
93+ * of one at a time. This method is in place since some DTrace
94+ * implementations limit the number of times that providers can be
95+ * created. When numerous providers can be created at once with this
96+ * method, it will count only as a single creation point to DTrace, thus
97+ * it uses less system resources.
98+ * <p>
99+ * All of the probes in the providers will be visible to DTrace after
100+ * this call and all will remain visible until all of the providers
101+ * are disposed.
102+ * <p>
103+ * The {@code moduleName} parameter will override any {@code ModuleName}
104+ * annotation associated with any of the providers in the set.
105+ * All of the probes created by this call will share the same
106+ * module name.
107+ * <p>
108+ * @param providers a set of provider specification interfaces
109+ * @param moduleName the module name to associate with all probes
110+ * @return A map which maps the provider interface specification to an
111+ * implementing instance.
112+ * @throws java.lang.SecurityException if a security manager has been
113+ * installed and it denies
114+ * RuntimePermission("com.sun.dtrace.jsdt.createProvider")
115+ * @throws java.lang.IllegalArgumentException if any of the interface
116+ * contains methods that do not return null, or that contain arguments
117+ * that are not String or integer types.
118+ */
119+ public Map<Class<? extends Provider>,Provider> createProviders(
120+ Set<Class<? extends Provider>> providers, String moduleName) {
121+ HashMap<Class<? extends Provider>,Provider> map =
122+ new HashMap<Class<? extends Provider>,Provider>();
123+ HashSet<DTraceProvider> jsdts = new HashSet<DTraceProvider>();
124+ for (Class<? extends Provider> cls : providers) {
125+ DTraceProvider jsdt = new DTraceProvider(cls);
126+ jsdts.add(jsdt);
127+ map.put(cls, jsdt.newProxyInstance());
128+ }
129+ new Activation(moduleName, jsdts.toArray(new DTraceProvider[0]));
130+ return map;
131+ }
132+
133+ /**
134+ * Used to check the status of DTrace support in the underlying JVM and
135+ * operating system.
136+ *
137+ * This is an informative method only - the Java-level effects of
138+ * creating providers and triggering probes will not change whether or
139+ * not DTrace is supported by the underlying systems.
140+ *
141+ * @return true if DTrace is supported
142+ */
143+ public static boolean isSupported() {
144+ try {
145+ SecurityManager security = System.getSecurityManager();
146+ if (security != null) {
147+ Permission perm = new RuntimePermission(
148+ "com.sun.tracing.dtrace.createProvider");
149+ security.checkPermission(perm);
150+ }
151+ return JVM.isSupported();
152+ } catch (SecurityException e) {
153+ return false;
154+ }
155+ }
156+}