org.usergrid.locking.zookeeper.ZooPut.java Source code

Introduction

Here is the source code for org.usergrid.locking.zookeeper.ZooPut.java

Source

/*******************************************************************************
 * Copyright 2012 Apigee Corporation
 * 
 * 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 org.usergrid.locking.zookeeper;

import java.io.IOException;

import org.apache.zookeeper.CreateMode;
import org.apache.zookeeper.KeeperException;
import org.apache.zookeeper.WatchedEvent;
import org.apache.zookeeper.Watcher;
import org.apache.zookeeper.ZooDefs;
import org.apache.zookeeper.ZooKeeper;
import org.apache.zookeeper.Watcher.Event.KeeperState;

/**
 * Util for uploading and updating files in ZooKeeper.
 *
 */
public class ZooPut implements Watcher {

    private ZooKeeper keeper;

    private boolean closeKeeper = true;

    private boolean connected = false;

    public ZooPut(String host) throws IOException {
        keeper = new ZooKeeper(host, 10000, this);
        // TODO: nocommit: this is asynchronous - think about how to deal with
        // connection
        // lost, and other failures
        synchronized (this) {
            while (!connected) {
                try {
                    this.wait();
                } catch (InterruptedException e) {
                    // nocommit
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
        }
    }

    public ZooPut(ZooKeeper keeper) throws IOException {
        this.closeKeeper = false;
        this.keeper = keeper;
    }

    public void close() throws InterruptedException {
        if (closeKeeper) {
            keeper.close();
        }
    }

    public void makePath(String path) throws KeeperException, InterruptedException {
        makePath(path, CreateMode.PERSISTENT);
    }

    public void makePath(String path, CreateMode createMode) throws KeeperException, InterruptedException {
        // nocommit
        System.out.println("make:" + path);

        if (path.startsWith("/")) {
            path = path.substring(1, path.length());
        }
        String[] paths = path.split("/");
        StringBuilder sbPath = new StringBuilder();
        for (int i = 0; i < paths.length; i++) {
            String pathPiece = paths[i];
            sbPath.append("/" + pathPiece);
            String currentPath = sbPath.toString();
            Object exists = keeper.exists(currentPath, null);
            if (exists == null) {
                CreateMode mode = CreateMode.PERSISTENT;
                if (i == paths.length - 1) {
                    mode = createMode;
                }
                keeper.create(currentPath, null, ZooDefs.Ids.OPEN_ACL_UNSAFE, mode);
            }
        }
    }

    @Override
    public void process(WatchedEvent event) {
        // nocommit: consider how we want to accomplish this
        if (event.getState() == KeeperState.SyncConnected) {
            synchronized (this) {
                connected = true;
                this.notify();
            }
        }

    }

}