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Camel Zookeeper Master Support
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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.camel.component.zookeepermaster;

import java.util.Map;

import org.apache.camel.Endpoint;
import org.apache.camel.spi.Metadata;
import org.apache.camel.spi.annotations.Component;
import org.apache.camel.util.ObjectHelper;

/**
 * The zookeeper-master camel component ensures that only a single endpoint in a cluster is active at any point in time
 * with all other JVMs being hot standbys which wait until the master JVM dies before taking over to provide high
 * availability of a single consumer.
 */
@Component("zookeeper-master")
public class MasterComponent extends ZookeeperComponentSupport {

    @Metadata(label = "advanced")
    private ContainerIdFactory containerIdFactory = new DefaultContainerIdFactory();

    @Metadata(defaultValue = "/camel/zookeepermaster/clusters/master")
    private String zkRoot = "/camel/zookeepermaster/clusters/master";

    public ContainerIdFactory getContainerIdFactory() {
        return containerIdFactory;
    }

    /**
     * To use a custom ContainerIdFactory for creating container ids.
     */
    public void setContainerIdFactory(ContainerIdFactory containerIdFactory) {
        this.containerIdFactory = containerIdFactory;
    }

    public String getZkRoot() {
        return zkRoot;
    }

    /**
     * The root path to use in zookeeper where information is stored which nodes are master/slave etc. Will by default
     * use: /camel/zookeepermaster/clusters/master
     */
    public void setZkRoot(String zkRoot) {
        this.zkRoot = zkRoot;
    }

    //  Implementation methods
    //-------------------------------------------------------------------------

    @Override
    protected Endpoint createEndpoint(String uri, String remaining, Map params) throws Exception {
        int idx = remaining.indexOf(':');
        if (idx <= 0) {
            throw new IllegalArgumentException(
                    "Missing : in URI so cannot split the group name from the actual URI for '" + remaining + "'");
        }
        // we are registering a regular endpoint
        String name = remaining.substring(0, idx);
        String childUri = remaining.substring(idx + 1);
        // we need to apply the params here
        if (params != null && params.size() > 0) {
            childUri = childUri + "?" + uri.substring(uri.indexOf('?') + 1);
        }
        return new MasterEndpoint(uri, this, name, childUri);
    }

    protected String getCamelClusterPath(String name) {
        String path = name;
        if (ObjectHelper.isNotEmpty(zkRoot)) {
            path = zkRoot + "/" + name;
        }
        return path;
    }

}