Source Code Cross Referenced for PluginEnvironment.java in  » ERP-CRM-Financial » Kuali-Financial-System » edu » iu » uis » eden » plugin » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » ERP CRM Financial » Kuali Financial System » edu.iu.uis.eden.plugin 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Copyright 2005-2006 The Kuali Foundation.
003:         * 
004:         * 
005:         * Licensed under the Educational Community License, Version 1.0 (the "License");
006:         * you may not use this file except in compliance with the License.
007:         * You may obtain a copy of the License at
008:         * 
009:         * http://www.opensource.org/licenses/ecl1.php
010:         * 
011:         * Unless required by applicable law or agreed to in writing, software
012:         * distributed under the License is distributed on an "AS IS" BASIS,
013:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014:         * See the License for the specific language governing permissions and
015:         * limitations under the License.
016:         */
017:        package edu.iu.uis.eden.plugin;
018:
019:        /**
020:         * A PluginEnvironment represents a Plugin and the PluginLoader from which it was loaded.
021:         * Grouping these together allows us to execute a reload of the Plugin since the Plugin
022:         * itself is not responsible for handling how it's own loading or reloading.
023:         * 
024:         * <p>The PluginEnvironment also keeps a reference to the PluginRegistry because this
025:         * allows it to add and remove Plugins as child resource loaders of the registry.
026:         *
027:         * @author ewestfal
028:         */
029:        public class PluginEnvironment implements  Reloadable {
030:
031:            private boolean loaded = false;
032:            private Plugin plugin;
033:            private final PluginLoader loader;
034:            private final PluginRegistry registry;
035:            private boolean supressStartupFailure = true;
036:
037:            /**
038:             * Constructs an unloaded PluginEnvironment from the given PluginLoader and PluginRegistry.
039:             * The environment will not be loaded until the first time that load() is executed.
040:             */
041:            public PluginEnvironment(PluginLoader loader,
042:                    PluginRegistry registry) {
043:                this .loader = loader;
044:                this .registry = registry;
045:            }
046:
047:            /**
048:             * Constructs a PluginEnvironment representing the given loaded Plugin.  Environments created
049:             * in this manner will indicate that they are loaded from the moment they are constructed.
050:             */
051:            public PluginEnvironment(Plugin plugin, PluginLoader loader,
052:                    PluginRegistry registry) {
053:                this (loader, registry);
054:                this .plugin = plugin;
055:                this .loaded = true;
056:            }
057:
058:            /**
059:             * Returns true if this environment has been loaded, false otherwise.  If this method returns
060:             * false then getPlugin() may return null if the environment was never loaded after construction.
061:             */
062:            public boolean isLoaded() {
063:                return loaded;
064:            }
065:
066:            /**
067:             * Returns a boolean indicating whether or not this PluginEnvironment is truly reloadable.
068:             * 
069:             * This will return false if the Plugin represents a plugin which can not be reloaded
070:             * (like the institutional plugin).
071:             */
072:            public boolean isReloadable() {
073:                // TODO for now the institutional plugin is not reloadable
074:                return !PluginUtils.isInstitutionalPlugin(plugin);
075:            }
076:
077:            /**
078:             * Indicates whether or not a reload of this environment is needed.  If this method
079:             * returns true, it should continue to return true until a reload() is executed.
080:             */
081:            public synchronized boolean isReloadNeeded() {
082:                return loader.isModified();
083:            }
084:
085:            /**
086:             * Reloads the environment by effectively executing an unload() followed by a load().
087:             */
088:            public synchronized void reload() throws Exception {
089:                unload();
090:                load();
091:            }
092:
093:            /**
094:             * Loads the plugin from the PluginLoader.  This will also start the Plugin and add it
095:             * to the PluginRegistry's resoure loaders.
096:             */
097:            public synchronized void load() throws Exception {
098:                plugin = loader.load();
099:                plugin.setSupressStartupFailure(supressStartupFailure);
100:                // it's important that the plugin is added to the resource loading system prior to startup because
101:                // startup may need to grab services
102:                registry.addResourceLoader(plugin);
103:                plugin.start();
104:                loaded = true;
105:            }
106:
107:            /**
108:             * Unloads the plugin.  The effectively shuts the plugin down and removes it from the
109:             * PluginRegistry's resource loaders.
110:             * @throws Exception
111:             */
112:            public synchronized void unload() throws Exception {
113:                plugin.stop();
114:                // it's important that the plugin be removed from the resource loading system after shutdown in
115:                // case the plugin needs to access the resource loader during shutdown
116:                registry.removeResourceLoader(plugin.getName());
117:                loaded = false;
118:            }
119:
120:            /**
121:             * Gets the Plugin represented by this environment.  May be null if this environment has not
122:             * yet been loaded.
123:             */
124:            public Plugin getPlugin() {
125:                return plugin;
126:            }
127:
128:            /**
129:             * Gets the PluginLoader which loaded the Plugin in this environment.
130:             */
131:            public PluginLoader getLoader() {
132:                return loader;
133:            }
134:
135:            /**
136:             * By default, startup failure is supressed.  If it is indicated that startup failure
137:             * supression is not desired, then startup errors will be thrown directly from calls to
138:             * load().
139:             */
140:            public void setSupressStartupFailure(boolean supressStartupFailure) {
141:                this.supressStartupFailure = supressStartupFailure;
142:            }
143:
144:        }
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