001    /**
002     * Copyright (c) 2010 Yahoo! Inc. All rights reserved.
003     * Licensed under the Apache License, Version 2.0 (the "License");
004     * you may not use this file except in compliance with the License.
005     * You may obtain a copy of the License at
006     *
007     *   http://www.apache.org/licenses/LICENSE-2.0
008     *
009     *  Unless required by applicable law or agreed to in writing, software
010     *  distributed under the License is distributed on an "AS IS" BASIS,
011     *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
012     *  See the License for the specific language governing permissions and
013     *  limitations under the License. See accompanying LICENSE file.
014     */
015    package org.apache.oozie.util.db;
016    
017    import org.apache.commons.dbcp.BasicDataSource;
018    import org.apache.oozie.service.InstrumentationService;
019    import org.apache.oozie.service.Services;
020    import org.apache.oozie.util.Instrumentation;
021    
022    public class InstrumentedBasicDataSource extends BasicDataSource {
023        public static final String INSTR_GROUP = "jdbc";
024        public static final String INSTR_NAME = "connections.active";
025    
026        /**
027         * The created datasource instruments the active DB connections.
028         */
029        public InstrumentedBasicDataSource() {
030            Instrumentation instr = Services.get().get(InstrumentationService.class).get();
031            instr.addSampler(INSTR_GROUP, INSTR_NAME, 60, 1, new Instrumentation.Variable<Long>() {
032                public Long getValue() {
033                    return (long) getNumActive();
034                }
035            });
036        }
037    
038    }