Source Code Cross Referenced for AbstractApplicationEventMulticaster.java in  » J2EE » spring-framework-2.0.6 » org » springframework » context » event » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » J2EE » spring framework 2.0.6 » org.springframework.context.event 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Copyright 2002-2006 the original author or authors.
003:         *
004:         * Licensed under the Apache License, Version 2.0 (the "License");
005:         * you may not use this file except in compliance with the License.
006:         * You may obtain a copy of the License at
007:         *
008:         *      http://www.apache.org/licenses/LICENSE-2.0
009:         *
010:         * Unless required by applicable law or agreed to in writing, software
011:         * distributed under the License is distributed on an "AS IS" BASIS,
012:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013:         * See the License for the specific language governing permissions and
014:         * limitations under the License.
015:         */
016:
017:        package org.springframework.context.event;
018:
019:        import java.util.Collection;
020:
021:        import org.springframework.beans.BeanUtils;
022:        import org.springframework.context.ApplicationListener;
023:        import org.springframework.core.CollectionFactory;
024:
025:        /**
026:         * Abstract implementation of the ApplicationEventMulticaster interface,
027:         * providing the basic listener registration facility.
028:         *
029:         * <p>Doesn't permit multiple instances of the same listener by default,
030:         * as it keeps listeners in a linked Set. The collection class used to hold
031:         * ApplicationListener objects can be overridden through the "collectionClass"
032:         * bean property.
033:         *
034:         * <p>Note that this class doesn't try to do anything clever to ensure thread
035:         * safety if listeners are added or removed at runtime. A technique such as
036:         * Copy-on-Write (Lea:137) could be used to ensure this, but the assumption in
037:         * the basic version of the class is that listeners will be added at application
038:         * configuration time and not added or removed as the application runs.
039:         *
040:         * <p>A custom collection class must be specified to allow for thread-safe
041:         * runtime registration of listeners. A good candidate for this is Doug Lea's
042:         * <code>java.util.concurrent.CopyOnWriteArraySet</code> or its non-JDK predecessor,
043:         * <code>EDU.oswego.cs.dl.util.concurrent.CopyOnWriteArraySet</code> (or the
044:         * respective CopyOnWriteArrayList version, allowing for registering the same
045:         * listener multiple times). Those classes provide a thread-safe Iterator,
046:         * optimized for read-mostly usage - matching this use case nicely.
047:         *
048:         * <p>Implementing ApplicationEventMulticaster's actual <code>multicastEvent</code>
049:         * method is left to subclasses. SimpleApplicationEventMulticaster simply multicasts
050:         * all events to all registered listeners, invoking them in the calling thread.
051:         * Alternative implementations could be more sophisticated in those respects.
052:         *
053:         * @author Juergen Hoeller
054:         * @since 1.2.3
055:         * @see #setCollectionClass
056:         * @see #getApplicationListeners()
057:         * @see SimpleApplicationEventMulticaster
058:         */
059:        public abstract class AbstractApplicationEventMulticaster implements 
060:                ApplicationEventMulticaster {
061:
062:            /** Collection of ApplicationListeners */
063:            private Collection applicationListeners = CollectionFactory
064:                    .createLinkedSetIfPossible(16);
065:
066:            /**
067:             * Specify the collection class to use. Can be populated with a fully
068:             * qualified class name when defined in a Spring application context.
069:             * <p>Default is a linked HashSet, keeping the registration order.
070:             * If no linked Set implementation is available, a plain HashSet will
071:             * be used as fallback (not keeping the registration order).
072:             * <p>Note that a Set class specified will not permit multiple instances
073:             * of the same listener, while a List class will allow for registering
074:             * the same listener multiple times.
075:             * <p>Consider Doug Lea's <code>java.util.concurrent.CopyOnWriteArraySet</code> or its
076:             * non-JDK predecessor, <code>EDU.oswego.cs.dl.util.concurrent.CopyOnWriteArraySet</code>
077:             * (or the respective CopyOnWriteArrayList version). Those classes provide a thread-safe
078:             * Iterator, optimized for read-mostly usage - matching this use case nicely.
079:             * @see org.springframework.core.CollectionFactory#createLinkedSetIfPossible
080:             * @see java.util.concurrent.CopyOnWriteArraySet
081:             * @see EDU.oswego.cs.dl.util.concurrent.CopyOnWriteArraySet
082:             */
083:            public void setCollectionClass(Class collectionClass) {
084:                if (collectionClass == null) {
085:                    throw new IllegalArgumentException(
086:                            "collectionClass must not be null");
087:                }
088:                if (!Collection.class.isAssignableFrom(collectionClass)) {
089:                    throw new IllegalArgumentException(
090:                            "collectionClass must implement [java.util.Collection]");
091:                }
092:                // Create desired collection instance.
093:                // Add all previously registered listeners (usually none).
094:                Collection newColl = (Collection) BeanUtils
095:                        .instantiateClass(collectionClass);
096:                newColl.addAll(this .applicationListeners);
097:                this .applicationListeners = newColl;
098:            }
099:
100:            public void addApplicationListener(ApplicationListener listener) {
101:                this .applicationListeners.add(listener);
102:            }
103:
104:            public void removeApplicationListener(ApplicationListener listener) {
105:                this .applicationListeners.remove(listener);
106:            }
107:
108:            public void removeAllListeners() {
109:                this .applicationListeners.clear();
110:            }
111:
112:            /**
113:             * Return the current Collection of ApplicationListeners.
114:             * <p>Note that this is the raw Collection of ApplicationListeners,
115:             * potentially modified when new listeners get registered or
116:             * existing ones get removed. This Collection is not a snapshot copy.
117:             * @return a Collection of ApplicationListeners
118:             * @see org.springframework.context.ApplicationListener
119:             */
120:            protected Collection getApplicationListeners() {
121:                return applicationListeners;
122:            }
123:
124:        }
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