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Efficient reliable UDP unicast, UDP multicast, and IPC transport protocol.
There is a newer version: 1.48.0
/*
 * Copyright 2014-2024 Real Logic Limited.
 *
 * 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
 *
 * https://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.aeron.cluster;

import io.aeron.cluster.client.AeronCluster;
import io.aeron.cluster.codecs.*;
import io.aeron.logbuffer.BufferClaim;
import org.agrona.ExpandableArrayBuffer;
import org.agrona.collections.ArrayUtil;

import static io.aeron.cluster.ClusterSession.MAX_ENCODED_MEMBERSHIP_QUERY_LENGTH;

class EgressPublisher
{
    private static final int SEND_ATTEMPTS = 3;

    private final BufferClaim bufferClaim = new BufferClaim();
    private final ExpandableArrayBuffer buffer = new ExpandableArrayBuffer(MAX_ENCODED_MEMBERSHIP_QUERY_LENGTH);
    private final MessageHeaderEncoder messageHeaderEncoder = new MessageHeaderEncoder();
    private final SessionEventEncoder sessionEventEncoder = new SessionEventEncoder();
    private final ChallengeEncoder challengeEncoder = new ChallengeEncoder();
    private final NewLeaderEventEncoder newLeaderEventEncoder = new NewLeaderEventEncoder();
    private final AdminResponseEncoder adminResponseEncoder = new AdminResponseEncoder();

    boolean sendEvent(
        final ClusterSession session,
        final long leadershipTermId,
        final int leaderMemberId,
        final EventCode code,
        final String detail)
    {
        final int length = MessageHeaderEncoder.ENCODED_LENGTH +
            SessionEventEncoder.BLOCK_LENGTH +
            SessionEventEncoder.detailHeaderLength() +
            detail.length();

        int attempts = SEND_ATTEMPTS;
        do
        {
            final long position = session.tryClaim(length, bufferClaim);
            if (position > 0)
            {
                sessionEventEncoder
                    .wrapAndApplyHeader(bufferClaim.buffer(), bufferClaim.offset(), messageHeaderEncoder)
                    .clusterSessionId(session.id())
                    .correlationId(session.correlationId())
                    .leadershipTermId(leadershipTermId)
                    .leaderMemberId(leaderMemberId)
                    .code(code)
                    .version(AeronCluster.Configuration.PROTOCOL_SEMANTIC_VERSION)
                    .detail(detail);

                bufferClaim.commit();

                return true;
            }
        }
        while (--attempts > 0);

        return false;
    }

    boolean sendChallenge(final ClusterSession session, final byte[] encodedChallenge)
    {
        challengeEncoder
            .wrapAndApplyHeader(buffer, 0, messageHeaderEncoder)
            .clusterSessionId(session.id())
            .correlationId(session.correlationId())
            .putEncodedChallenge(encodedChallenge, 0, encodedChallenge.length);

        final int length = MessageHeaderEncoder.ENCODED_LENGTH + challengeEncoder.encodedLength();

        int attempts = SEND_ATTEMPTS;
        do
        {
            final long position = session.offer(buffer, 0, length);
            if (position > 0)
            {
                return true;
            }
        }
        while (--attempts > 0);

        return false;
    }

    boolean newLeader(
        final ClusterSession session,
        final long leadershipTermId,
        final int leaderMemberId,
        final String ingressEndpoints)
    {
        final int length = MessageHeaderEncoder.ENCODED_LENGTH +
            NewLeaderEventEncoder.BLOCK_LENGTH +
            NewLeaderEventEncoder.ingressEndpointsHeaderLength() +
            ingressEndpoints.length();

        int attempts = SEND_ATTEMPTS;
        do
        {
            final long position = session.tryClaim(length, bufferClaim);
            if (position > 0)
            {
                newLeaderEventEncoder
                    .wrapAndApplyHeader(bufferClaim.buffer(), bufferClaim.offset(), messageHeaderEncoder)
                    .clusterSessionId(session.id())
                    .leadershipTermId(leadershipTermId)
                    .leaderMemberId(leaderMemberId)
                    .ingressEndpoints(ingressEndpoints);

                bufferClaim.commit();

                return true;
            }
        }
        while (--attempts > 0);

        return false;
    }

    boolean sendAdminResponse(
        final ClusterSession session,
        final long correlationId,
        final AdminRequestType adminRequestType,
        final AdminResponseCode responseCode,
        final String message)
    {
        adminResponseEncoder
            .wrapAndApplyHeader(buffer, 0, messageHeaderEncoder)
            .clusterSessionId(session.id())
            .correlationId(correlationId)
            .requestType(adminRequestType)
            .responseCode(responseCode)
            .message(message)
            .putPayload(ArrayUtil.EMPTY_BYTE_ARRAY, 0, 0);

        final int length = MessageHeaderEncoder.ENCODED_LENGTH + adminResponseEncoder.encodedLength();

        int attempts = SEND_ATTEMPTS;
        do
        {
            final long position = session.offer(buffer, 0, length);
            if (position > 0)
            {
                return true;
            }
        }
        while (--attempts > 0);

        return false;
    }

    public String toString()
    {
        return "EgressPublisher{}";
    }
}