Source Code Cross Referenced for RuleServiceProviderImpl.java in  » Rule-Engine » drolls-Rule-Engine » org » drools » jsr94 » rules » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Rule Engine » drolls Rule Engine » org.drools.jsr94.rules 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        package org.drools.jsr94.rules;
002:
003:        /*
004:         * Copyright 2005 JBoss Inc
005:         * 
006:         * Licensed under the Apache License, Version 2.0 (the "License");
007:         * you may not use this file except in compliance with the License.
008:         * You may obtain a copy of the License at
009:         * 
010:         *      http://www.apache.org/licenses/LICENSE-2.0
011:         * 
012:         * Unless required by applicable law or agreed to in writing, software
013:         * distributed under the License is distributed on an "AS IS" BASIS,
014:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015:         * See the License for the specific language governing permissions and
016:         * limitations under the License.
017:         */
018:
019:        import javax.rules.ConfigurationException;
020:        import javax.rules.RuleRuntime;
021:        import javax.rules.RuleServiceProvider;
022:        import javax.rules.RuleServiceProviderManager;
023:        import javax.rules.admin.RuleAdministrator;
024:
025:        import org.drools.jsr94.rules.admin.RuleAdministratorImpl;
026:        import org.drools.jsr94.rules.admin.RuleExecutionSetRepository;
027:
028:        /**
029:         * This class provides access to the <code>RuleRuntime</code> and
030:         * <code>RuleAdministrator</code> implementation supplied by Drools when
031:         * running under J2SE. <p/> This class should be used in environments without a
032:         * JNDI provider - typically when writing standalone J2SE clients. Within the
033:         * J2EE environment the <code>RuleServiceProvider</code> implementation class
034:         * provided by Drools should be retrieved using a JNDI lookup. <p/> This class
035:         * should be constructed using the
036:         * <code>RuleServiceProviderManager.getRuleServiceProvider</code> method.
037:         * This class is automatically registered to "http://drools.org/" on startup, 
038:         * via the static block.
039:         * 
040:         * @see RuleRuntimeImpl
041:         * @see RuleAdministratorImpl
042:         * @see RuleServiceProvider
043:         * @see javax.rules.RuleServiceProviderManager#getRuleServiceProvider(String)
044:         * 
045:         * @author <a href="mailto:thomas.diesler@softcon-itec.de">thomas diesler </a>
046:         */
047:        public class RuleServiceProviderImpl extends RuleServiceProvider
048:                implements  java.io.Serializable {
049:            public static final String RULE_SERVICE_PROVIDER = "http://drools.org/";
050:
051:            /** An instance of <code>RuleRuntimeImpl</code>. */
052:            private RuleRuntime ruleRuntime;
053:
054:            /** An instance of <code>RuleAdministratorImpl</code>. */
055:            private RuleAdministrator ruleAdministrator;
056:
057:            private RuleExecutionSetRepository repository;
058:
059:            static {
060:                try {
061:                    RuleServiceProviderManager.registerRuleServiceProvider(
062:                            RULE_SERVICE_PROVIDER,
063:                            RuleServiceProviderImpl.class);
064:                } catch (ConfigurationException e) {
065:                    System.err
066:                            .println("Unable to regiser Rule Service  Provider "
067:                                    + RULE_SERVICE_PROVIDER);
068:                }
069:            }
070:
071:            /**
072:             * Create a new <code>RuleServiceProviderImpl</code>.
073:             */
074:            public RuleServiceProviderImpl() {
075:                // no special initialization required
076:            }
077:
078:            /**
079:             * Returns the RuleExecutionSetRepository
080:             * @return
081:             */
082:            public synchronized RuleExecutionSetRepository getRepository() {
083:                // Lazy loaded
084:                if (this .repository == null) {
085:                    this .repository = new RuleExecutionSetRepository();
086:                }
087:                return this .repository;
088:            }
089:
090:            /**
091:             * Returns a class instance of <code>RuleRuntime</code>. Specifically an
092:             * instance of the Drools <code>RuleRuntimeImpl</code> is returned.
093:             * 
094:             * @return an instance of <code>RuleRuntime</code>
095:             */
096:            public synchronized RuleRuntime getRuleRuntime() {
097:                if (this .ruleRuntime == null) {
098:                    this .ruleRuntime = new RuleRuntimeImpl(getRepository());
099:                }
100:
101:                return this .ruleRuntime;
102:            }
103:
104:            /**
105:             * Returns a class instance of <code>RuleAdministrator</code>.
106:             * Specifically an instance of the Drools <code>RuleAdministratorImpl</code>
107:             * is returned.
108:             * 
109:             * @return an instance of <code>RuleAdministrator</code>
110:             */
111:            public synchronized RuleAdministrator getRuleAdministrator() {
112:                // Lazy instantiate
113:                if (this .ruleAdministrator == null) {
114:                    this .ruleAdministrator = new RuleAdministratorImpl(
115:                            getRepository());
116:                }
117:                return this.ruleAdministrator;
118:            }
119:        }
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