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Efficient reliable UDP unicast, UDP multicast, and IPC transport protocol.
/*
* 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.client;
import io.aeron.FragmentAssembler;
import io.aeron.Subscription;
import io.aeron.cluster.codecs.*;
import io.aeron.logbuffer.FragmentHandler;
import io.aeron.logbuffer.Header;
import org.agrona.DirectBuffer;
import static io.aeron.cluster.client.AeronCluster.SESSION_HEADER_LENGTH;
/**
* Adapter for dispatching egress messages from a cluster to a {@link EgressListener}.
*/
public final class EgressAdapter implements FragmentHandler
{
private final long clusterSessionId;
private final int fragmentLimit;
private final MessageHeaderDecoder messageHeaderDecoder = new MessageHeaderDecoder();
private final SessionEventDecoder sessionEventDecoder = new SessionEventDecoder();
private final NewLeaderEventDecoder newLeaderEventDecoder = new NewLeaderEventDecoder();
private final AdminResponseDecoder adminResponseDecoder = new AdminResponseDecoder();
private final SessionMessageHeaderDecoder sessionMessageHeaderDecoder = new SessionMessageHeaderDecoder();
private final FragmentAssembler fragmentAssembler = new FragmentAssembler(this);
private final EgressListener listener;
private final EgressListenerExtension listenerExtension;
private final Subscription subscription;
/**
* Construct an adapter for cluster egress which consumes from the subscription and dispatches to the
* {@link EgressListener}.
*
* @param listener to dispatch events to.
* @param clusterSessionId for the egress.
* @param subscription over the egress stream.
* @param fragmentLimit to poll on each {@link #poll()} operation.
*/
public EgressAdapter(
final EgressListener listener,
final long clusterSessionId,
final Subscription subscription,
final int fragmentLimit)
{
this(listener, null, clusterSessionId, subscription, fragmentLimit);
}
/**
* Construct an adapter for cluster egress which consumes from the subscription and dispatches to the
* {@link EgressListener} or extension messages to {@link EgressListenerExtension}.
*
* @param listener to dispatch events to.
* @param listenerExtension to dispatch extension messages to
* @param clusterSessionId for the egress.
* @param subscription over the egress stream.
* @param fragmentLimit to poll on each {@link #poll()} operation.
*/
public EgressAdapter(
final EgressListener listener,
final EgressListenerExtension listenerExtension,
final long clusterSessionId,
final Subscription subscription,
final int fragmentLimit)
{
this.clusterSessionId = clusterSessionId;
this.fragmentLimit = fragmentLimit;
this.listener = listener;
this.listenerExtension = listenerExtension;
this.subscription = subscription;
}
/**
* Poll the egress subscription and dispatch assembled events to the {@link EgressListener}.
*
* @return the number of fragments consumed.
*/
public int poll()
{
return subscription.poll(fragmentAssembler, fragmentLimit);
}
/**
* {@inheritDoc}
*/
@SuppressWarnings("MethodLength")
public void onFragment(final DirectBuffer buffer, final int offset, final int length, final Header header)
{
messageHeaderDecoder.wrap(buffer, offset);
final int templateId = messageHeaderDecoder.templateId();
final int schemaId = messageHeaderDecoder.schemaId();
if (schemaId != MessageHeaderDecoder.SCHEMA_ID)
{
if (listenerExtension != null)
{
listenerExtension.onExtensionMessage(
messageHeaderDecoder.blockLength(),
templateId,
schemaId,
messageHeaderDecoder.version(),
buffer,
offset + MessageHeaderDecoder.ENCODED_LENGTH,
length - MessageHeaderDecoder.ENCODED_LENGTH);
return;
}
throw new ClusterException("expected schemaId=" +
MessageHeaderDecoder.SCHEMA_ID + ", actual=" + schemaId);
}
switch (templateId)
{
case SessionMessageHeaderDecoder.TEMPLATE_ID:
{
sessionMessageHeaderDecoder.wrap(
buffer,
offset + MessageHeaderDecoder.ENCODED_LENGTH,
messageHeaderDecoder.blockLength(),
messageHeaderDecoder.version());
final long sessionId = sessionMessageHeaderDecoder.clusterSessionId();
if (sessionId == clusterSessionId)
{
listener.onMessage(
sessionId,
sessionMessageHeaderDecoder.timestamp(),
buffer,
offset + SESSION_HEADER_LENGTH,
length - SESSION_HEADER_LENGTH,
header);
}
break;
}
case SessionEventDecoder.TEMPLATE_ID:
{
sessionEventDecoder.wrap(
buffer,
offset + MessageHeaderDecoder.ENCODED_LENGTH,
messageHeaderDecoder.blockLength(),
messageHeaderDecoder.version());
final long sessionId = sessionEventDecoder.clusterSessionId();
if (sessionId == clusterSessionId)
{
listener.onSessionEvent(
sessionEventDecoder.correlationId(),
sessionId,
sessionEventDecoder.leadershipTermId(),
sessionEventDecoder.leaderMemberId(),
sessionEventDecoder.code(),
sessionEventDecoder.detail());
}
break;
}
case NewLeaderEventDecoder.TEMPLATE_ID:
{
newLeaderEventDecoder.wrap(
buffer,
offset + MessageHeaderDecoder.ENCODED_LENGTH,
messageHeaderDecoder.blockLength(),
messageHeaderDecoder.version());
final long sessionId = newLeaderEventDecoder.clusterSessionId();
if (sessionId == clusterSessionId)
{
listener.onNewLeader(
sessionId,
newLeaderEventDecoder.leadershipTermId(),
newLeaderEventDecoder.leaderMemberId(),
newLeaderEventDecoder.ingressEndpoints());
}
break;
}
case AdminResponseDecoder.TEMPLATE_ID:
{
adminResponseDecoder.wrap(
buffer,
offset + MessageHeaderDecoder.ENCODED_LENGTH,
messageHeaderDecoder.blockLength(),
messageHeaderDecoder.version());
final long sessionId = adminResponseDecoder.clusterSessionId();
if (sessionId == clusterSessionId)
{
final long correlationId = adminResponseDecoder.correlationId();
final AdminRequestType requestType = adminResponseDecoder.requestType();
final AdminResponseCode responseCode = adminResponseDecoder.responseCode();
final String message = adminResponseDecoder.message();
final int payloadOffset = adminResponseDecoder.offset() +
AdminResponseDecoder.BLOCK_LENGTH +
AdminResponseDecoder.messageHeaderLength() +
message.length() +
AdminResponseDecoder.payloadHeaderLength();
final int payloadLength = adminResponseDecoder.payloadLength();
listener.onAdminResponse(
sessionId,
correlationId,
requestType,
responseCode,
message,
buffer,
payloadOffset,
payloadLength);
}
break;
}
default:
break;
}
}
}
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