/*
 * Copyright (C) 2005-present, 58.com.  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.wuba.wpaxos.store;

import java.nio.ByteBuffer;

import com.wuba.wpaxos.config.WriteState;

/**
 * append data to MapedByteBuffer
 */
public interface AppendDataCallback {
    
    /**
     * write MapedByteBuffer
     * 
     * @param byteBuffer
     * @param maxBlank
     * @param data
     * @param writestate to decide msg type
     * @return How many bytes to write
     */
    public AppendDataResult doAppend(final long fileFromOffset, final ByteBuffer byteBuffer,
            final int maxBlank, final byte[] data, WriteState writestate);
}
