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
019package org.apache.oozie.util.db;
020
021import com.google.common.annotations.VisibleForTesting;
022import com.google.common.base.Predicate;
023
024/**
025 * Helper class for simulating DB failures.
026 */
027public class FailingDBHelperForTest {
028    static final Predicate<String> DEFAULT_DB_PREDICATE = new FailingConnectionWrapper.OozieDmlStatementPredicate();
029    // predicate which defines when the failure should be injected.
030    // By default the DML statements for Oozie tables witt be the targeted statements
031    @VisibleForTesting
032    static Predicate<String> dbPredicate = DEFAULT_DB_PREDICATE;
033
034    /**
035     * change the used predicate value
036     * @param predicate
037     */
038    @VisibleForTesting
039    public static void setDbPredicate (final Predicate predicate) {
040        FailingDBHelperForTest.dbPredicate = predicate;
041    }
042
043    /**
044     * reset the predicate, to the default Oozie DML predicate.
045     */
046    @VisibleForTesting
047    public static void resetDbPredicate() {
048        FailingDBHelperForTest.dbPredicate = DEFAULT_DB_PREDICATE;
049    }
050}