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

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Here is the source code for com.vmware.photon.controller.common.zookeeper.ZookeeperHostReader.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.host.gen.HostConfig;

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 parsing and reading host configuration.
 */
public class ZookeeperHostReader implements ZookeeperServerReader {

    /**
     * @param data the znode payload
     * @return the Inet address of the host captured in the payload.
     */
    public InetSocketAddress deserialize(byte[] data) {
        HostConfig config = new HostConfig();
        try {
            new TDeserializer().deserialize(config, data);
        } catch (TException e) {
            throw new RuntimeException(e);
        }
        return new InetSocketAddress(config.getAddress().getHost(), config.getAddress().getPort());
    }

    /**
     * @param nodeName the nodeName
     * @return the zk node corresponding to hosts
     */
    public String basePath(String nodeName) {
        return ZKPaths.makePath("hosts", nodeName);
    }

    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<>();
        if (!nodeName.isEmpty()) {
            // We are actually monitoring a specific agent.
            nodes.add(ZKPaths.makePath("hosts", nodeName));
        } else {
            List<String> parent = zkClient.getChildren().forPath(basePath(nodeName));
            for (String nodePath : parent) {
                nodes.add(ZKPaths.makePath(basePath(nodeName), nodePath));
            }
        }
        return nodes;
    }
}