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Clustering module for QWAZR
There is a newer version: 1.5.2
/*
 * Copyright 2015-2020 Emmanuel Keller / QWAZR
 * 
 * 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.qwazr.cluster;

import javax.ws.rs.InternalServerErrorException;
import java.io.Externalizable;
import java.lang.reflect.Constructor;
import java.util.Set;
import java.util.UUID;

enum ClusterProtocol {

    join('J', FullContent.class),
    notify('N', AddressContent.class),
    forward('F', FullContent.class),
    reply('R', FullContent.class),
    alive('A', AddressContent.class),
    leave('L', AddressContent.class);

    final static String CHAR_HEADER = "QWAZR";

    final char cmd;
    final Constructor messageClassConstructor;


    ClusterProtocol(final char cmd, final Class messageClass) {
        this.cmd = cmd;
        try {
            this.messageClassConstructor = messageClass.getDeclaredConstructor();
        }
        catch (NoSuchMethodException e) {
            throw new InternalServerErrorException("No constructor for the class " + messageClass, e);
        }
    }

    static ClusterProtocol findCommand(final char cmd) {
        for (ClusterProtocol command : values())
            if (command.cmd == cmd)
                return command;
        throw new IllegalArgumentException("Command not found: " + cmd);
    }

    static MessageContent newJoin(final String address, final UUID nodeLiveId, final Set groups,
                                  final Set services) {
        return new MessageContent(join, new FullContent(address, nodeLiveId, groups, services));
    }

    static MessageContent newNotify(final AddressContent address) {
        return new MessageContent(notify, address);
    }

    static MessageContent newForward(final String address, final UUID nodeLiveId, final Set groups,
                                     final Set services) {
        return new MessageContent(forward, new FullContent(address, nodeLiveId, groups, services));
    }

    static MessageContent newReply(final String address, final UUID nodeLiveId, final Set groups,
                                   final Set services) {
        return new MessageContent(reply, new FullContent(address, nodeLiveId, groups, services));
    }

    static MessageContent newAlive(final String address, final UUID nodeLiveId) {
        return new MessageContent(alive, new AddressContent(address, nodeLiveId));
    }

    static MessageContent newLeave(final String address, final UUID nodeLiveId) {
        return new MessageContent(leave, new AddressContent(address, nodeLiveId));
    }

}