Apache ZooKeeper Server Source Code

Apache ZooKeeper is an open-source server which enables highly reliable distributed coordination.

Apache ZooKeeper Server Source Code files are provided in the source packge (apache-zookeeper-3.7.0.tar.gz). You can download it at Apache ZooKeeper Website.

You can also browse Apache ZooKeeper Server Source Code below:

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 * 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,
 * See the License for the specific language governing permissions and
 * limitations under the License.

package org.apache.zookeeper.server.persistence;

import java.io.File;
import java.io.IOException;
import java.util.Map;
import org.apache.zookeeper.server.DataTree;

 * snapshot interface for the persistence layer.
 * implement this interface for implementing
 * snapshots.
public interface SnapShot {

     * deserialize a data tree from the last valid snapshot and
     * return the last zxid that was deserialized
     * @param dt the datatree to be deserialized into
     * @param sessions the sessions to be deserialized into
     * @return the last zxid that was deserialized from the snapshot
     * @throws IOException
    long deserialize(DataTree dt, Map<Long, Integer> sessions) throws IOException;

     * persist the datatree and the sessions into a persistence storage
     * @param dt the datatree to be serialized
     * @param sessions the session timeouts to be serialized
     * @param name the object name to store snapshot into
     * @param fsync sync the snapshot immediately after write
     * @throws IOException
    void serialize(DataTree dt, Map<Long, Integer> sessions, File name, boolean fsync) throws IOException;

     * find the most recent snapshot file
     * @return the most recent snapshot file
     * @throws IOException
    File findMostRecentSnapshot() throws IOException;

     * get information of the last saved/restored snapshot
     * @return info of last snapshot
    SnapshotInfo getLastSnapshotInfo();

     * free resources from this snapshot immediately
     * @throws IOException
    void close() throws IOException;




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2018-10-18, 28931👍, 1💬