diff options
Diffstat (limited to 'java/java/broker/src/org/apache/qpid/server/registry/ApplicationRegistry.java')
| -rw-r--r-- | java/java/broker/src/org/apache/qpid/server/registry/ApplicationRegistry.java | 200 |
1 files changed, 200 insertions, 0 deletions
diff --git a/java/java/broker/src/org/apache/qpid/server/registry/ApplicationRegistry.java b/java/java/broker/src/org/apache/qpid/server/registry/ApplicationRegistry.java new file mode 100644 index 0000000000..48331843e5 --- /dev/null +++ b/java/java/broker/src/org/apache/qpid/server/registry/ApplicationRegistry.java @@ -0,0 +1,200 @@ +/* + * + * Licensed to the Apache Software Foundation (ASF) under one + * or more contributor license agreements. See the NOTICE file + * distributed with this work for additional information + * regarding copyright ownership. The ASF licenses this file + * to you under the Apache License, Version 2.0 (the + * "License"); you may not use this file except in compliance + * with the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, + * software distributed under the License is distributed on an + * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY + * KIND, either express or implied. See the License for the + * specific language governing permissions and limitations + * under the License. + * + */ +package org.apache.qpid.server.registry; + +import org.apache.commons.configuration.Configuration; +import org.apache.log4j.Logger; +import org.apache.qpid.server.configuration.Configurator; + +import java.util.HashMap; +import java.util.Iterator; +import java.util.Map; + +/** + * An abstract application registry that provides access to configuration information and handles the + * construction and caching of configurable objects. + * <p/> + * Subclasses should handle the construction of the "registered objects" such as the exchange registry. + */ +public abstract class ApplicationRegistry implements IApplicationRegistry +{ + private static final Logger _logger = Logger.getLogger(ApplicationRegistry.class); + + private static Map _instanceMap = new HashMap(); + + private final Map<Class<?>, Object> _configuredObjects = new HashMap<Class<?>, Object>(); + + protected final Configuration _configuration; + + public static final int DEFAULT_INSTANCE = 1; + public static final String DEFAULT_APPLICATION_REGISTRY = "org.apache.qpid.server.util.NullApplicationRegistry"; + public static String _APPLICATION_REGISTRY = DEFAULT_APPLICATION_REGISTRY; + + static + { + Runtime.getRuntime().addShutdownHook(new Thread(new ShutdownService())); + } + + private static class ShutdownService implements Runnable + { + public void run() + { + _logger.info("Shutting down application registries..."); + try + { + synchronized (ApplicationRegistry.class) + { + Iterator keyIterator = _instanceMap.keySet().iterator(); + + while (keyIterator.hasNext()) + { + int key = (Integer) keyIterator.next(); + IApplicationRegistry instance = (IApplicationRegistry) _instanceMap.get(key); + + if ((instance != null)) + { + if (instance.getMessageStore() != null) + { + instance.getMessageStore().close(); + } + } + } + } + } + catch (Exception e) + { + _logger.error("Error shutting down message store: " + e, e); + } + } + } + + public static void initialise(IApplicationRegistry instance) throws Exception + { + initialise(instance, DEFAULT_INSTANCE); + } + + public static void initialise(IApplicationRegistry instance, int instanceID) throws Exception + { + if (instance != null) + { + _logger.info("Initialising Application Registry:" + instanceID); + _instanceMap.put(instanceID, instance); + + try + { + instance.initialise(); + } + catch (Exception e) + { + _instanceMap.remove(instanceID); + throw e; + } + } + else + { + remove(instanceID); + } + } + + public static void remove(int instanceID) + { + try + { + ((IApplicationRegistry) _instanceMap.get(instanceID)).getMessageStore().close(); + } + catch (Exception e) + { + + } + finally + { + _instanceMap.remove(instanceID); + } + } + + + protected ApplicationRegistry(Configuration configuration) + { + _configuration = configuration; + } + + public static IApplicationRegistry getInstance() + { + return getInstance(DEFAULT_INSTANCE); + } + + public static IApplicationRegistry getInstance(int instanceID) + { + IApplicationRegistry instance = (IApplicationRegistry) _instanceMap.get(instanceID); + + if (instance == null) + { + try + { + _logger.info("Creating DEFAULT_APPLICATION_REGISTRY: " + _APPLICATION_REGISTRY + " : Instance:" + instanceID); + IApplicationRegistry registry = (IApplicationRegistry) Class.forName(_APPLICATION_REGISTRY).getConstructor((Class[]) null).newInstance((Object[]) null); + ApplicationRegistry.initialise(registry, instanceID); + _logger.info("Initialised Application Registry:" + instanceID); + return registry; + } + catch (Exception e) + { + _logger.error("Error configuring application: " + e, e); + //throw new AMQBrokerCreationException(instanceID, "Unable to create Application Registry instance " + instanceID); + throw new RuntimeException("Unable to create Application Registry"); + } + } + else + { + return instance; + } + } + + public Configuration getConfiguration() + { + return _configuration; + } + + public <T> T getConfiguredObject(Class<T> instanceType) + { + T instance = (T) _configuredObjects.get(instanceType); + if (instance == null) + { + try + { + instance = instanceType.newInstance(); + } + catch (Exception e) + { + _logger.error("Unable to instantiate configuration class " + instanceType + " - ensure it has a public default constructor"); + throw new IllegalArgumentException("Unable to instantiate configuration class " + instanceType + " - ensure it has a public default constructor"); + } + Configurator.configure(instance); + _configuredObjects.put(instanceType, instance); + } + return instance; + } + + public static void setDefaultApplicationRegistry(String clazz) + { + _APPLICATION_REGISTRY = clazz; + } +} |