io.hekate.coordinate.internal.CoordinationProtocolCodec Maven / Gradle / Ivy

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Java library for cluster communications and computing.
There is a newer version: 4.1.3
/*
 * Copyright 2020 The Hekate Project
 *
 * The Hekate Project 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 io.hekate.coordinate.internal;

import io.hekate.cluster.ClusterHash;
import io.hekate.cluster.ClusterNodeId;
import io.hekate.codec.Codec;
import io.hekate.codec.CodecFactory;
import io.hekate.codec.CodecUtils;
import io.hekate.codec.DataReader;
import io.hekate.codec.DataWriter;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

import static io.hekate.codec.CodecUtils.writeNodeId;
import static io.hekate.codec.CodecUtils.writeTopologyHash;

class CoordinationProtocolCodec implements Codec {
    private static final CoordinationProtocol.Type[] TYPES_CACHE = CoordinationProtocol.Type.values();

    private final Map> codecFactories;

    private final Map> codecs = new HashMap<>();

    public CoordinationProtocolCodec(Map> codecFactories) {
        this.codecFactories = codecFactories;
    }

    @Override
    public boolean isStateful() {
        return true;
    }

    @Override
    public Class baseType() {
        return CoordinationProtocol.class;
    }

    @Override
    public void encode(CoordinationProtocol msg, DataWriter out) throws IOException {
        CoordinationProtocol.Type type = msg.type();

        out.writeByte(type.ordinal());

        switch (type) {
            case PREPARE: {
                CoordinationProtocol.Prepare request = (CoordinationProtocol.Prepare)msg;

                out.writeUTF(request.processName());
                writeEpoch(request.epoch(), out);
                writeNodeId(request.from(), out);
                writeTopologyHash(request.topologyHash(), out);

                break;
            }
            case REQUEST: {
                CoordinationProtocol.Request request = (CoordinationProtocol.Request)msg;

                out.writeUTF(request.processName());
                writeEpoch(request.epoch(), out);
                writeNodeId(request.from(), out);

                codecFor(request.processName()).encode(request.request(), out);

                break;
            }
            case RESPONSE: {
                CoordinationProtocol.Response response = (CoordinationProtocol.Response)msg;

                out.writeUTF(response.processName());

                codecFor(response.processName()).encode(response.response(), out);

                break;
            }
            case CONFIRM:
            case REJECT: {
                // No-op.

                break;
            }
            case COMPLETE: {
                CoordinationProtocol.Complete request = (CoordinationProtocol.Complete)msg;

                out.writeUTF(request.processName());
                writeEpoch(request.epoch(), out);
                writeNodeId(request.from(), out);

                break;
            }
            default: {
                throw new IllegalArgumentException("Unexpected message type: " + msg);
            }
        }
    }

    @Override
    public CoordinationProtocol decode(DataReader in) throws IOException {
        CoordinationProtocol.Type type = TYPES_CACHE[in.readByte()];

        switch (type) {
            case PREPARE: {
                String process = in.readUTF();
                CoordinationEpoch epoch = readEpoch(in);
                ClusterNodeId from = CodecUtils.readNodeId(in);
                ClusterHash hash = CodecUtils.readTopologyHash(in);

                return new CoordinationProtocol.Prepare(process, from, epoch, hash);
            }
            case REQUEST: {
                String process = in.readUTF();
                CoordinationEpoch epoch = readEpoch(in);
                ClusterNodeId from = CodecUtils.readNodeId(in);

                Object request = codecFor(process).decode(in);

                return new CoordinationProtocol.Request(process, from, epoch, request);
            }
            case RESPONSE: {
                String process = in.readUTF();

                Object response = codecFor(process).decode(in);

                return new CoordinationProtocol.Response(process, response);
            }
            case REJECT: {
                return CoordinationProtocol.Reject.INSTANCE;
            }
            case CONFIRM: {
                return CoordinationProtocol.Confirm.INSTANCE;
            }
            case COMPLETE: {
                String process = in.readUTF();
                CoordinationEpoch epoch = readEpoch(in);
                ClusterNodeId from = CodecUtils.readNodeId(in);

                return new CoordinationProtocol.Complete(process, from, epoch);
            }
            default: {
                throw new IllegalArgumentException("Unexpected message type: " + type);
            }
        }
    }

    private Codec