/*
* Copyright (c) 2008-2017, Hazelcast, Inc. All Rights Reserved.
*
* Licensed 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 com.hazelcast.ringbuffer;
import com.hazelcast.spi.exception.SilentException;
/**
* An {@link RuntimeException} that is thrown when accessing an item in the {@link Ringbuffer} using a sequence that is smaller
* than the current head sequence and that the ringbuffer store is disabled. This means that the item isn't available in the
* ringbuffer and it cannot be loaded from the store either, thus being completely unavailable.
*/
public class StaleSequenceException extends RuntimeException implements SilentException {
private final long headSeq;
/**
* Creates a StaleSequenceException with the given message.
*
* @param message the message
* @param headSeq the last known head sequence.
*/
public StaleSequenceException(String message, long headSeq) {
super(message);
this.headSeq = headSeq;
}
/**
* Returns the last known head sequence. Beware that this sequence could already be stale again if you want to use it
* to do a {@link com.hazelcast.ringbuffer.Ringbuffer#readOne(long)}.
*
* @return last known head sequence.
*/
public long getHeadSeq() {
return headSeq;
}
}