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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 org.apache.camel.Category;
import org.apache.camel.Consumer;
import org.apache.camel.DelegateEndpoint;
import org.apache.camel.Endpoint;
import org.apache.camel.Processor;
import org.apache.camel.Producer;
import org.apache.camel.api.management.ManagedAttribute;
import org.apache.camel.api.management.ManagedResource;
import org.apache.camel.spi.Metadata;
import org.apache.camel.spi.UriEndpoint;
import org.apache.camel.spi.UriPath;
import org.apache.camel.support.DefaultEndpoint;

/**
 * Have only a single consumer in a cluster consuming from a given endpoint; with automatic failover if the JVM dies.
 */
@ManagedResource(description = "Managed ZooKeeper Master Endpoint")
@UriEndpoint(firstVersion = "2.19.0", scheme = "zookeeper-master", syntax = "zookeeper-master:groupName:consumerEndpointUri",
             consumerOnly = true,
             title = "ZooKeeper Master", lenientProperties = true,
             category = { Category.CLUSTERING, Category.MANAGEMENT, Category.BIGDATA })
public class MasterEndpoint extends DefaultEndpoint implements DelegateEndpoint {

    private final MasterComponent component;
    private final Endpoint consumerEndpoint;

    @UriPath(description = "The name of the cluster group to use")
    @Metadata(required = true)
    private final String groupName;

    @UriPath(description = "The consumer endpoint to use in master/slave mode")
    @Metadata(required = true)
    private final String consumerEndpointUri;

    public MasterEndpoint(String uri, MasterComponent component, String groupName, String consumerEndpointUri) {
        super(uri, component);
        this.component = component;
        this.groupName = groupName;
        this.consumerEndpointUri = consumerEndpointUri;
        this.consumerEndpoint = getCamelContext().getEndpoint(consumerEndpointUri);
    }

    @Override
    public Endpoint getEndpoint() {
        return consumerEndpoint;
    }

    public Endpoint getConsumerEndpoint() {
        return getEndpoint();
    }

    @ManagedAttribute(description = "The consumer endpoint url to use in master/slave mode", mask = true)
    public String getConsumerEndpointUri() {
        return consumerEndpointUri;
    }

    @ManagedAttribute(description = "The name of the cluster group to use")
    public String getGroupName() {
        return groupName;
    }

    @Override
    public Producer createProducer() throws Exception {
        throw new UnsupportedOperationException("Cannot produce from this endpoint");
    }

    @Override
    public Consumer createConsumer(Processor processor) throws Exception {
        return new MasterConsumer(this, processor);
    }

    @Override
    public boolean isLenientProperties() {
        // to allow properties to be propagated to the child endpoint
        return true;
    }

    @Override
    public MasterComponent getComponent() {
        return component;
    }

}