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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 }