001: /**********************************************************************************
002: * $URL: https://source.sakaiproject.org/svn/component/tags/sakai_2-4-1/component-api/component/src/java/org/sakaiproject/component/cover/ComponentManager.java $
003: * $Id: ComponentManager.java 8039 2006-04-20 17:01:39Z ggolden@umich.edu $
004: ***********************************************************************************
005: *
006: * Copyright (c) 2005, 2006 The Sakai Foundation.
007: *
008: * Licensed under the Educational Community License, Version 1.0 (the "License");
009: * you may not use this file except in compliance with the License.
010: * You may obtain a copy of the License at
011: *
012: * http://www.opensource.org/licenses/ecl1.php
013: *
014: * Unless required by applicable law or agreed to in writing, software
015: * distributed under the License is distributed on an "AS IS" BASIS,
016: * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
017: * See the License for the specific language governing permissions and
018: * limitations under the License.
019: *
020: **********************************************************************************/package org.sakaiproject.component.cover;
021:
022: import java.util.Set;
023:
024: import org.sakaiproject.component.impl.SpringCompMgr;
025:
026: /**
027: * <p>
028: * ComponentManager is a static Cover for the {@link org.sakaiproject.component.api.ComponentManager Component Manager}; see that interface for usage details.
029: * </p>
030: * <p>
031: * This cover is special. As a cover for the component manager, it cannot use the component manager to find the instance. Instead, this is where a static single-instance singleton ComponentManger of a particular type is created.
032: * </p>
033: */
034: public class ComponentManager {
035: /** A component manager - use the Spring based one. */
036: private static org.sakaiproject.component.api.ComponentManager m_componentManager = null;
037:
038: /** If true, covers will cache the components they find once - good for production, bad for some unit testing. */
039: public static final boolean CACHE_COMPONENTS = true;
040:
041: public static java.lang.String SAKAI_COMPONENTS_ROOT_SYS_PROP = org.sakaiproject.component.api.ComponentManager.SAKAI_COMPONENTS_ROOT_SYS_PROP;
042:
043: private static Object m_syncObj = new Object();
044:
045: /**
046: * Access the component manager of the single instance.
047: *
048: * @return The ComponentManager.
049: */
050: public static org.sakaiproject.component.api.ComponentManager getInstance() {
051: // make sure we make only one instance
052: synchronized (m_syncObj) {
053: // if we do not yet have our component manager instance, create and init / populate it
054: if (m_componentManager == null) {
055: m_componentManager = new SpringCompMgr(null);
056: ((SpringCompMgr) m_componentManager).init();
057: }
058: }
059:
060: return m_componentManager;
061: }
062:
063: public static Object get(Class iface) {
064: return getInstance().get(iface);
065: }
066:
067: public static Object get(String ifaceName) {
068: return getInstance().get(ifaceName);
069: }
070:
071: public static boolean contains(Class iface) {
072: return getInstance().contains(iface);
073: }
074:
075: public static boolean contains(String ifaceName) {
076: return getInstance().contains(ifaceName);
077: }
078:
079: public static Set getRegisteredInterfaces() {
080: return getInstance().getRegisteredInterfaces();
081: }
082:
083: public static void loadComponent(Class iface, Object component) {
084: getInstance().loadComponent(iface, component);
085: }
086:
087: public static void loadComponent(String ifaceName, Object component) {
088: getInstance().loadComponent(ifaceName, component);
089: }
090:
091: public static void close() {
092: getInstance().close();
093: }
094:
095: public static java.util.Properties getConfig() {
096: return getInstance().getConfig();
097: }
098:
099: public static void waitTillConfigured() {
100: getInstance();
101: }
102:
103: public static boolean hasBeenClosed() {
104: return getInstance().hasBeenClosed();
105: }
106: }
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