/*
 * (C) 2007-2012 Alibaba Group Holding Limited.
 * 
 * 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.
 * Authors:
 *   wuhua <wq163@163.com> , boyan <killme2008@gmail.com>
 */
package com.taobao.metamorphosis.client.consumer;

/**
 * Fetch����������ӿ�
 * 
 * @author boyan
 * @Date 2011-5-4
 * 
 */
public interface FetchManager {
    /**
     * Returns current fetch requests count.
     * 
     * @since 1.4.4
     * @return
     */
    public int getFetchRequestCount();


    /**
     * ֹͣfetch
     * 
     * @throws InterruptedException
     */
    public void stopFetchRunner() throws InterruptedException;


    /**
     * ����״̬������״̬������ò�start
     */
    public void resetFetchState();


    /**
     * ����������
     */
    public void startFetchRunner();


    /**
     * ���fetch����
     * 
     * @param request
     */
    public void addFetchRequest(FetchRequest request);


    /**
     * �Ƿ�ر�
     * 
     * @return
     */
    public boolean isShutdown();
}