com.vmware.photon.controller.common.zookeeper.ZookeeperServiceReader.java Source code

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Here is the source code for com.vmware.photon.controller.common.zookeeper.ZookeeperServiceReader.java

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/*
 * Copyright 2015 VMware, Inc. 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.vmware.photon.controller.common.zookeeper;

import com.vmware.photon.controller.common.zookeeper.gen.ServerAddress;

import org.apache.curator.framework.CuratorFramework;
import org.apache.curator.utils.ZKPaths;
import org.apache.thrift.TDeserializer;
import org.apache.thrift.TException;

import java.net.InetSocketAddress;
import java.util.ArrayList;
import java.util.List;

/**
 * Zookeeper reader for reading ip configuration of services.
 * Typically these services are backed by zk ephemeral nodes.
 */
public class ZookeeperServiceReader implements ZookeeperServerReader {

    /**
     * @param data the znode payload
     * @return the service ip address
     */
    public InetSocketAddress deserialize(byte[] data) {
        ServerAddress serverAddress = new ServerAddress();
        try {
            new TDeserializer().deserialize(serverAddress, data);
        } catch (TException e) {
            throw new RuntimeException(e);
        }
        return new InetSocketAddress(serverAddress.getHost(), serverAddress.getPort());
    }

    /**
     * @param nodeName the nodeName
     * @return the service zk path for a given service node
     */
    public String basePath(String nodeName) {
        return ZKPaths.makePath("services", nodeName);
    }

    /**
     * Return the list of services under the nodeName.
     *
     * @param zkClient
     * @param nodeName
     * @return The list of services under the nodename.
     * @throws Exception
     */
    public List<String> nodePaths(CuratorFramework zkClient, String nodeName) throws Exception {
        // XXX TODO(amar): There are two ways in which hosts are monitored either by watching /hosts or by attempting to
        // monitor a specific host. The list of nodes in both these cases is different.
        // Unify this by only monitoring /hosts. https://www.pivotaltracker.com/story/show/82171608
        List<String> nodes = new ArrayList<>();

        List<String> parent = zkClient.getChildren().forPath(basePath(nodeName));
        for (String nodePath : parent) {
            nodes.add(ZKPaths.makePath(basePath(nodeName), nodePath));
        }
        return nodes;
    }
}