/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.hadoop.hive.metastore;
import javax.jdo.JDOException;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hive.metastore.api.InvalidOperationException;
import org.apache.hadoop.hive.metastore.api.MetaException;
import org.apache.hadoop.hive.metastore.api.NoSuchObjectException;
import org.apache.hadoop.hive.metastore.events.PreEventContext;
/**
*
* AlternateFailurePreListener.
*
* An implementation of MetaStorePreEventListener which fails every other time it's invoked,
* starting with the first time.
*
* It also records and makes available the number of times it's been invoked.
*/
public class AlternateFailurePreListener extends MetaStorePreEventListener {
private static int callCount = 0;
private static boolean throwException = true;
public AlternateFailurePreListener(Configuration config) {
super(config);
}
@Override
public void onEvent(PreEventContext context) throws MetaException, NoSuchObjectException,
InvalidOperationException {
callCount++;
if (throwException) {
throwException = false;
throw new JDOException();
}
throwException = true;
}
public static int getCallCount() {
return callCount;
}
}