diff options
Diffstat (limited to 'qpid/java/broker-core/src/main/java/org/apache/qpid/server/model/EventType.java')
-rw-r--r-- | qpid/java/broker-core/src/main/java/org/apache/qpid/server/model/EventType.java | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/qpid/java/broker-core/src/main/java/org/apache/qpid/server/model/EventType.java b/qpid/java/broker-core/src/main/java/org/apache/qpid/server/model/EventType.java new file mode 100644 index 0000000000..edd5ce4250 --- /dev/null +++ b/qpid/java/broker-core/src/main/java/org/apache/qpid/server/model/EventType.java @@ -0,0 +1,60 @@ +/* + * + * 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.model; + +import java.util.HashMap; +import java.util.Map; + +/** + * A type of event generated by a ConfiguredObject. + */ +public abstract class EventType<T extends EventType<T>> +{ + private static final Map<Class<? extends EventType>, Integer> EVENT_TYPES = + new HashMap<Class<? extends EventType>, Integer>(); + + private final int _classId; + + protected EventType() + { + synchronized (EVENT_TYPES) + { + if(EVENT_TYPES.containsKey(getClass())) + { + throw new IllegalArgumentException("Cannot define more one instance of the same EventType " + + getClass().getName()); + } + else + { + _classId = EVENT_TYPES.size(); + EVENT_TYPES.put(getClass(), _classId); + } + } + } + + public final int getId() + { + return _classId; + } + + abstract public Event<T> newEvent(); +} |