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 java.util.HashSet;
022import java.util.Set;
023
024import com.google.common.base.Predicate;
025
026public abstract class DatabaseRetryPredicate implements Predicate<Throwable> {
027
028    @Override
029    public abstract boolean apply(Throwable input);
030
031    /*
032     * Helper method for subclasses to retrieve all exceptions in a set. "All exceptions" means the exception
033     * hierarchy that can be walked by calling getCause() repeatedly.
034     *
035     * Subclasses either check if a particular exception was raised or not, or need the SQLException to extract the
036     * error code. In both cases the exception has to be found.
037     */
038    protected Set<Class<?>> getAllExceptions(final Throwable t) {
039        final Set<Class<?>> exceptions = new HashSet<>();
040
041        exceptions.add(t.getClass());
042
043        Throwable ex = t;
044        while (ex.getCause() != null) {
045            exceptions.add(ex.getCause().getClass());
046            ex = ex.getCause();
047        }
048
049        return exceptions;
050    }
051}