001 /** 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 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 org.apache.activemq.store.jdbc; 018 019 import java.io.IOException; 020 021 import org.apache.activemq.Service; 022 023 /** 024 * Represents some kind of lock service to ensure that a broker is the only master 025 * 026 * @version $Revision: $ 027 */ 028 public interface DatabaseLocker extends Service { 029 030 /** 031 * allow the injection of a jdbc persistence adapter 032 * @param adapter the persistence adapter to use 033 * @throws IOException 034 */ 035 void setPersistenceAdapter(JDBCPersistenceAdapter adapter) throws IOException; 036 037 /** 038 * Used by a timer to keep alive the lock. 039 * If the method returns false the broker should be terminated 040 */ 041 boolean keepAlive(); 042 043 /** 044 * set the delay interval in milliseconds between lock acquire attempts 045 * @param lockAcquireSleepInterval the sleep interval in miliseconds 046 */ 047 void setLockAcquireSleepInterval(long lockAcquireSleepInterval); 048 049 }