org.apache.blur.shell.RemoveShardServerCommand.java Source code

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Here is the source code for org.apache.blur.shell.RemoveShardServerCommand.java

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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,
 * 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.apache.blur.shell;

import java.io.IOException;
import java.io.PrintWriter;

import jline.console.ConsoleReader;

import org.apache.blur.BlurConfiguration;
import org.apache.blur.thirdparty.thrift_0_9_0.TException;
import org.apache.blur.thrift.generated.Blur;
import org.apache.blur.thrift.generated.BlurException;
import org.apache.blur.utils.BlurConstants;
import org.apache.zookeeper.KeeperException;
import org.apache.zookeeper.WatchedEvent;
import org.apache.zookeeper.Watcher;
import org.apache.zookeeper.ZooKeeper;

public class RemoveShardServerCommand extends Command {
    @Override
    public void doit(PrintWriter out, Blur.Iface client, String[] args)
            throws CommandException, TException, BlurException {
        if (args.length != 2) {
            throw new CommandException("Invalid args: " + help());
        }
        ZooKeeper zooKeeper = null;
        try {
            try {
                BlurConfiguration configuration = new BlurConfiguration();
                String connectString = configuration.get(BlurConstants.BLUR_ZOOKEEPER_CONNECTION);
                int sessionTimeout = configuration.getInt(BlurConstants.BLUR_ZOOKEEPER_TIMEOUT, 30000);
                zooKeeper = new ZooKeeper(connectString, sessionTimeout, new Watcher() {
                    @Override
                    public void process(WatchedEvent event) {

                    }
                });
            } catch (IOException e) {
                if (Main.debug) {
                    e.printStackTrace();
                }
                throw new CommandException(e.getMessage());
            }

            String node = args[1];

            out.println("Are you sure you want to remove the shard server [" + node + "]? [y/N]");
            out.flush();

            ConsoleReader reader = getConsoleReader();
            try {
                int readCharacter = reader.readCharacter();
                if (!(readCharacter == 'y' || readCharacter == 'Y')) {
                    return;
                }
            } catch (IOException e) {
                if (Main.debug) {
                    e.printStackTrace();
                }
                throw new CommandException(e.getMessage());
            }

            String path = "/blur/clusters/" + Main.getCluster(client) + "/online-nodes/" + node;
            zooKeeper.delete(path, -1);
        } catch (InterruptedException e) {
            if (Main.debug) {
                e.printStackTrace();
            }
            throw new CommandException(e.getMessage());
        } catch (KeeperException e) {
            if (Main.debug) {
                e.printStackTrace();
            }
            throw new CommandException(e.getMessage());
        } finally {
            if (zooKeeper != null) {
                try {
                    zooKeeper.close();
                } catch (InterruptedException e) {
                    if (Main.debug) {
                        e.printStackTrace();
                    }
                }
            }
        }
    }

    @Override
    public String description() {
        return "Remove a node from ZooKeeper which will cause the cluster to consider it dead.";
    }

    @Override
    public String usage() {
        return "<node:port>";
    }

    @Override
    public String name() {
        return "remove-shard";
    }
}