001: /* ====================================================================
002: * The Jcorporate Apache Style Software License, Version 1.2 05-07-2002
003: *
004: * Copyright (c) 1995-2002 Jcorporate Ltd. All rights reserved.
005: *
006: * Redistribution and use in source and binary forms, with or without
007: * modification, are permitted provided that the following conditions
008: * are met:
009: *
010: * 1. Redistributions of source code must retain the above copyright
011: * notice, this list of conditions and the following disclaimer.
012: *
013: * 2. Redistributions in binary form must reproduce the above copyright
014: * notice, this list of conditions and the following disclaimer in
015: * the documentation and/or other materials provided with the
016: * distribution.
017: *
018: * 3. The end-user documentation included with the redistribution,
019: * if any, must include the following acknowledgment:
020: * "This product includes software developed by Jcorporate Ltd.
021: * (http://www.jcorporate.com/)."
022: * Alternately, this acknowledgment may appear in the software itself,
023: * if and wherever such third-party acknowledgments normally appear.
024: *
025: * 4. "Jcorporate" and product names such as "Expresso" must
026: * not be used to endorse or promote products derived from this
027: * software without prior written permission. For written permission,
028: * please contact info@jcorporate.com.
029: *
030: * 5. Products derived from this software may not be called "Expresso",
031: * or other Jcorporate product names; nor may "Expresso" or other
032: * Jcorporate product names appear in their name, without prior
033: * written permission of Jcorporate Ltd.
034: *
035: * 6. No product derived from this software may compete in the same
036: * market space, i.e. framework, without prior written permission
037: * of Jcorporate Ltd. For written permission, please contact
038: * partners@jcorporate.com.
039: *
040: * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
041: * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
042: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
043: * DISCLAIMED. IN NO EVENT SHALL JCORPORATE LTD OR ITS CONTRIBUTORS
044: * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
045: * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
046: * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
047: * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
048: * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
049: * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
050: * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
051: * SUCH DAMAGE.
052: * ====================================================================
053: *
054: * This software consists of voluntary contributions made by many
055: * individuals on behalf of the Jcorporate Ltd. Contributions back
056: * to the project(s) are encouraged when you make modifications.
057: * Please send them to support@jcorporate.com. For more information
058: * on Jcorporate Ltd. and its products, please see
059: * <http://www.jcorporate.com/>.
060: *
061: * Portions of this software are based upon other open source
062: * products and are subject to their respective licenses.
063: */
064:
065: package com.jcorporate.expresso.kernel.management;
066:
067: import EDU.oswego.cs.dl.util.concurrent.ConcurrentReaderHashMap;
068: import com.jcorporate.expresso.kernel.RootContainerInterface;
069:
070: import java.util.Map;
071:
072: /**
073: * This class allows controllers and other classes to potentially access
074: * Expresso Runtime Environments that they aren't necessarily a part of. This
075: * is critical for Management tools, which, by nature are outside of the Expresso
076: * container hierarchy.
077: *
078: * @author Michael Rimov
079: * @version $Revision: 1.5 $ on $Date: 2004/11/17 20:48:17 $
080: */
081:
082: public final class ExpressoRuntimeMap {
083:
084: /**
085: * The actual runtime map
086: */
087: private static Map runtimeMap = new ConcurrentReaderHashMap();
088:
089: /**
090: * The default runtime if no key is specified.
091: */
092: private static RootContainerInterface defaultRuntime = null;
093:
094: /**
095: * An object synchronizing access to the default variable runtime.
096: */
097: private static Object DefaultRuntimeLock = new Object();
098:
099: /**
100: * Default constructor
101: */
102: public ExpressoRuntimeMap() {
103: }
104:
105: /**
106: * Add this runtime to the system
107: *
108: * @param name Name of the runtime. If blank, it is automatically considered
109: * the default runtime. If it is the first runtime to be entered, it is also
110: * set as the default runtime until something else takes it place.
111: * @param expressoRuntime The Root Container of a particular runtime environment.
112: */
113: public synchronized static void registerRuntime(String name,
114: RootContainerInterface expressoRuntime) {
115: if (expressoRuntime == null) {
116: throw new IllegalArgumentException(
117: "Cannot pass in a null Root Container");
118: }
119:
120: if (name != null && name.length() > 0) {
121: runtimeMap.put(name, expressoRuntime);
122: }
123:
124: synchronized (DefaultRuntimeLock) {
125: if (defaultRuntime == null || name == null
126: || name.length() == 0) {
127: defaultRuntime = expressoRuntime;
128: }
129: }
130: }
131:
132: /**
133: * Retrieve a runtime environment as specified by the name parameter. If name
134: * is null or empty string, it returns the default runtime, if not, then
135: * it will return whatever is in the internal Runtime Map;
136: *
137: * @param name Name of the runtime to retrieve.
138: * @return the Expresso Root Container as specified by name.
139: */
140: public static RootContainerInterface getRuntime(String name) {
141: if (name == null || name.length() == 0) {
142: synchronized (DefaultRuntimeLock) {
143: return defaultRuntime;
144: }
145: } else {
146: return (RootContainerInterface) runtimeMap.get(name);
147: }
148: }
149:
150: /**
151: * Retrieve the default runtime.
152: *
153: * @return a Root Container interface for the default runtime in this JVM
154: */
155: public static synchronized RootContainerInterface getDefaultRuntime() {
156: synchronized (DefaultRuntimeLock) {
157: return defaultRuntime;
158: }
159: }
160:
161: /**
162: * Unregister a runtime, this occurs when the runtime is being destroyed,
163: * either via a context reload or by a the container shutting down.
164: *
165: * @param name the Name of the context to unregister
166: */
167: public static synchronized void unregisterRuntime(String name) {
168: if (name == null || name.length() == 0) {
169: synchronized (DefaultRuntimeLock) {
170: defaultRuntime = null;
171: }
172: return;
173: }
174:
175: runtimeMap.remove(name);
176: }
177:
178: }
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