001    /**
002     * Licensed to the Apache Software Foundation (ASF) under one
003     * or more contributor license agreements.  See the NOTICE file
004     * distributed with this work for additional information
005     * regarding copyright ownership.  The ASF licenses this file
006     * to you under the Apache License, Version 2.0 (the
007     * "License"); you may not use this file except in compliance
008     * with the License.  You may obtain a copy of the License at
009     * 
010     *      http://www.apache.org/licenses/LICENSE-2.0
011     * 
012     * Unless required by applicable law or agreed to in writing, software
013     * distributed under the License is distributed on an "AS IS" BASIS,
014     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015     * See the License for the specific language governing permissions and
016     * limitations under the License.
017     */
018    package org.apache.oozie.util.db;
019    
020    import org.apache.commons.dbcp.BasicDataSource;
021    import org.apache.oozie.service.InstrumentationService;
022    import org.apache.oozie.service.Services;
023    import org.apache.oozie.util.Instrumentation;
024    
025    public class InstrumentedBasicDataSource extends BasicDataSource {
026        public static final String INSTR_GROUP = "jdbc";
027        public static final String INSTR_NAME = "connections.active";
028    
029        /**
030         * The created datasource instruments the active DB connections.
031         */
032        public InstrumentedBasicDataSource() {
033            InstrumentationService instrumentationService = Services.get().get(InstrumentationService.class);
034            if (instrumentationService != null) {
035                Instrumentation instr = instrumentationService.get();
036                instr.addSampler(INSTR_GROUP, INSTR_NAME, 60, 1, new Instrumentation.Variable<Long>() {
037                    public Long getValue() {
038                        return (long) getNumActive();
039                    }
040                });
041            }
042        }
043    
044    }