1   /*
2    * Copyright 2000-2001,2004 The Apache Software Foundation.
3    * 
4    * Licensed under the Apache License, Version 2.0 (the "License");
5    * you may not use this file except in compliance with the License.
6    * You may obtain a copy of the License at
7    * 
8    *      http://www.apache.org/licenses/LICENSE-2.0
9    * 
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS,
12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13   * See the License for the specific language governing permissions and
14   * limitations under the License.
15   */
16  
17  /* 
18  
19   */
20  
21  package org.apache.wsrp4j.producer;
22  
23  import java.util.Properties;
24  
25  import org.apache.wsrp4j.exception.ErrorCodes;
26  import org.apache.wsrp4j.exception.WSRPException;
27  import org.apache.wsrp4j.exception.WSRPXHelper;
28  import org.apache.wsrp4j.log.LogManager;
29  import org.apache.wsrp4j.log.Logger;
30  import org.apache.wsrp4j.util.Utility;
31  
32  /**
33   * This class provides a static method to access the ConsumerRegistry.
34   * Reads in the file "wsrp-services.properties".
35   *
36   * @author <a href="mailto:stefan.behl@de.ibm.com">Stefan Behl</a>
37   */
38  public class ConsumerRegistryAccess {
39  
40      // the name of the .properties file
41      private static String WSRP_SERVICES = "wsrp-services.properties";
42  
43      /** String representing a factory type */
44      public static String CONSUMER_REGISTRY_FACTORY = "consumer.registry.factory";
45  
46      // the content of the properties file
47      private static Properties pFactories = null;
48  
49      // holds an instance of a consumer registry
50      private static ConsumerRegistry consumerRegistry = null;
51  
52      // log and trace support
53      private static Logger logger = LogManager.getLogManager().getLogger(
54              ConsumerRegistryAccess.class);
55  
56      /**
57       * Fetches a ConsumerRegistry-instance utilizing the read
58       * ConsumerRegistryFactory and returns it.
59       *
60       * @return ConsumerRegistry-interface.
61       */
62      public static ConsumerRegistry getConsumerRegistry() throws WSRPException {
63          String MN = "getConsumerRegistry";
64          if (logger.isLogging(Logger.TRACE_HIGH)) {
65              logger.entry(Logger.TRACE_HIGH, MN);
66          }
67  
68          if (consumerRegistry == null) {
69              // get ConsumerRegistry
70              ConsumerRegistryFactory factory = (ConsumerRegistryFactory) getFactory(CONSUMER_REGISTRY_FACTORY);
71              consumerRegistry = factory.getConsumerRegistry(ProviderAccess
72                      .getProvider());
73          }
74  
75          if (logger.isLogging(Logger.TRACE_HIGH)) {
76              logger.exit(Logger.TRACE_HIGH, MN);
77          }
78  
79          return consumerRegistry;
80      }
81  
82      /**
83       Internal mehtod.
84       Returns a configured Factory class.
85       @param type java.lang.String representing the factory type.
86       @return java.lang.Object
87       */
88      private static Object getFactory(String type) throws WSRPException {
89          String MN = "getFactory";
90          if (logger.isLogging(Logger.TRACE_HIGH)) {
91              logger.entry(Logger.TRACE_HIGH, MN);
92          }
93  
94          Object obj = null;
95  
96          try {
97              pFactories = Utility.loadPropertiesFromFile(WSRP_SERVICES);
98              String factoryName = (String) pFactories.get(type);
99              Class cl = Class.forName(factoryName);
100 
101             if (logger.isLogging(Logger.TRACE_HIGH)) {
102                 logger.exit(Logger.TRACE_HIGH, MN);
103             }
104 
105             obj = cl.newInstance();
106 
107         }
108         catch (Exception e) {
109 
110             WSRPXHelper.throwX(logger, Logger.ERROR, MN,
111                     ErrorCodes.CONSUMER_REGISTRY_FACTORY_NOT_FOUND);
112 
113         }
114 
115         return obj;
116     }
117 }