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The RabbitMQ AMQP 1.0 Java client library defines an API to access RabbitMQ with the AMQP 1.0 protocol.

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// Copyright (c) 2024 Broadcom. All Rights Reserved.
// The term "Broadcom" refers to Broadcom Inc. and/or its subsidiaries.
//
// 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.
//
// If you have any questions regarding licensing, please contact us at
// [email protected].
package com.rabbitmq.client.amqp.impl;

import com.rabbitmq.client.amqp.*;
import java.time.Duration;
import java.util.Iterator;
import java.util.Map;
import java.util.UUID;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ScheduledFuture;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicLong;
import java.util.function.BiFunction;
import java.util.function.Function;
import java.util.function.Supplier;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

class AmqpRpcClient implements RpcClient {

  private static final Logger LOGGER = LoggerFactory.getLogger(AmqpRpcClient.class);

  private static final Publisher.Callback NO_OP_CALLBACK = ctx -> {};

  private final AmqpConnection connection;
  private final Clock clock;
  private final Publisher publisher;
  private final Consumer consumer;
  private final Map outstandingRequests = new ConcurrentHashMap<>();
  private final Supplier correlationIdSupplier;
  private final BiFunction requestPostProcessor;
  private final Function correlationIdExtractor;
  private final AtomicBoolean closed = new AtomicBoolean(false);
  private final Duration requestTimeout;
  private final ScheduledFuture requestTimeoutFuture;

  AmqpRpcClient(RpcSupport.AmqpRpcClientBuilder builder) {
    this.connection = builder.connection();
    this.clock = this.connection.clock();

    AmqpPublisherBuilder publisherBuilder =
        (AmqpPublisherBuilder) this.connection.publisherBuilder();
    ((DefaultAddressBuilder) builder.requestAddress()).copyTo(publisherBuilder.addressBuilder());
    this.publisher = publisherBuilder.build();

    String replyTo = builder.replyToQueue();
    if (replyTo == null) {
      Management.QueueInfo queueInfo =
          this.connection.management().queue().exclusive(true).autoDelete(true).declare();
      replyTo = queueInfo.name();
    }
    if (builder.correlationIdExtractor() == null) {
      this.correlationIdExtractor = Message::correlationId;
    } else {
      this.correlationIdExtractor = builder.correlationIdExtractor();
    }
    this.consumer =
        this.connection
            .consumerBuilder()
            .queue(replyTo)
            .messageHandler(
                (ctx, msg) -> {
                  ctx.accept();
                  OutstandingRequest request =
                      this.outstandingRequests.remove(this.correlationIdExtractor.apply(msg));
                  if (request != null) {
                    request.future.complete(msg);
                  }
                })
            .build();

    if (builder.correlationIdSupplier() == null) {
      String correlationIdPrefix = UUID.randomUUID().toString();
      AtomicLong correlationIdSequence = new AtomicLong();
      this.correlationIdSupplier =
          () -> correlationIdPrefix + "-" + correlationIdSequence.getAndIncrement();
    } else {
      this.correlationIdSupplier = builder.correlationIdSupplier();
    }

    if (builder.requestPostProcessor() == null) {
      DefaultAddressBuilder addressBuilder = Utils.addressBuilder();
      addressBuilder.queue(replyTo);
      String replyToAddress = addressBuilder.address();
      this.requestPostProcessor =
          (request, correlationId) -> request.replyTo(replyToAddress).messageId(correlationId);
    } else {
      this.requestPostProcessor = builder.requestPostProcessor();
    }

    this.requestTimeout = builder.requestTimeout();
    Runnable requestTimeoutTask = requestTimeoutTask();
    this.requestTimeoutFuture =
        this.connection
            .scheduledExecutorService()
            .scheduleAtFixedRate(
                () -> {
                  try {
                    requestTimeoutTask.run();
                  } catch (Exception e) {
                    LOGGER.info("Error during request timeout task: {}", e.getMessage());
                  }
                },
                this.requestTimeout.toMillis(),
                this.requestTimeout.toMillis(),
                TimeUnit.MILLISECONDS);
  }

  @Override
  public Message message() {
    return this.publisher.message();
  }

  @Override
  public Message message(byte[] body) {
    return this.publisher.message(body);
  }

  @Override
  public CompletableFuture publish(Message message) {
    checkOpen();
    Object correlationId = this.correlationIdSupplier.get();
    message = this.requestPostProcessor.apply(message, correlationId);
    long time = this.clock.time();
    CompletableFuture future = new CompletableFuture<>();
    this.outstandingRequests.put(correlationId, new OutstandingRequest(future, time));
    this.publisher.publish(message, NO_OP_CALLBACK);
    return future;
  }

  @Override
  public void close() {
    if (this.closed.compareAndSet(false, true)) {
      this.connection.removeRpcClient(this);
      this.requestTimeoutFuture.cancel(true);
      try {
        this.publisher.close();
      } catch (Exception e) {
        LOGGER.warn("Error while closing RPC client publisher: {}", e.getMessage());
      }
      try {
        this.consumer.close();
      } catch (Exception e) {
        LOGGER.warn("Error while closing RPC client consumer: {}", e.getMessage());
      }
      this.outstandingRequests
          .values()
          .forEach(r -> r.future.completeExceptionally(new AmqpException("RPC client is closed")));
    }
  }

  Runnable requestTimeoutTask() {
    return () -> {
      long limit = this.clock.time() - this.requestTimeout.toNanos();
      Iterator iterator = this.outstandingRequests.values().iterator();
      while (iterator.hasNext()) {
        if (Thread.currentThread().isInterrupted()) {
          return;
        }
        OutstandingRequest request = iterator.next();
        if (request.time < limit) {
          try {
            iterator.remove();
          } catch (Exception e) {
            LOGGER.warn("Error while pruning timed out request: {}", e.getMessage());
          }
          request.future.completeExceptionally(new AmqpException("RPC request timed out"));
        }
      }
    };
  }

  private void checkOpen() {
    if (this.closed.get()) {
      throw new AmqpException("RPC client is closed");
    }
  }

  private static class OutstandingRequest {

    private final CompletableFuture future;
    private final long time;

    private OutstandingRequest(CompletableFuture future, long time) {
      this.future = future;
      this.time = time;
    }
  }
}
    

    

    

            

    

            



    
    






    
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