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The RabbitMQ Java client library allows Java applications to interface with RabbitMQ.

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// Copyright (c) 2023 Broadcom. All Rights Reserved.
// The term "Broadcom" refers to Broadcom Inc. and/or its subsidiaries.
//
// This software, the RabbitMQ Java client library, is triple-licensed under the
// Mozilla Public License 2.0 ("MPL"), the GNU General Public License version 2
// ("GPL") and the Apache License version 2 ("ASL"). For the MPL, please see
// LICENSE-MPL-RabbitMQ. For the GPL, please see LICENSE-GPL2.  For the ASL,
// please see LICENSE-APACHE2.
//
// This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND,
// either express or implied. See the LICENSE file for specific language governing
// rights and limitations of this software.
//
// If you have any questions regarding licensing, please contact us at
// [email protected].
package com.rabbitmq.client.observation.micrometer;

import com.rabbitmq.client.observation.micrometer.RabbitMqObservationDocumentation.HighCardinalityTags;
import com.rabbitmq.client.observation.micrometer.RabbitMqObservationDocumentation.LowCardinalityTags;
import io.micrometer.common.KeyValues;
import io.micrometer.common.util.StringUtils;

/**
 * Default implementation of {@link DeliverObservationConvention}.
 *
 * @since 5.19.0
 * @see DeliverObservationConvention
 */
abstract class DefaultDeliverObservationConvention implements DeliverObservationConvention {

  private final String operation;

  public DefaultDeliverObservationConvention(String operation) {
    this.operation = operation;
  }

  @Override
  public String getContextualName(DeliverContext context) {
    return source(context.getQueue()) + " " + operation;
  }

  private String exchange(String destination) {
    return StringUtils.isNotBlank(destination) ? destination : "amq.default";
  }

  private String source(String destination) {
    return StringUtils.isNotBlank(destination) ? destination : "(anonymous)";
  }

  @Override
  public KeyValues getLowCardinalityKeyValues(DeliverContext context) {
    return KeyValues.of(
        LowCardinalityTags.MESSAGING_OPERATION.withValue(this.operation),
        LowCardinalityTags.MESSAGING_SYSTEM.withValue("rabbitmq"),
        LowCardinalityTags.NET_PROTOCOL_NAME.withValue("amqp"),
        LowCardinalityTags.NET_PROTOCOL_VERSION.withValue("0.9.1"));
  }

  @Override
  public KeyValues getHighCardinalityKeyValues(DeliverContext context) {
    return KeyValues.of(
        HighCardinalityTags.MESSAGING_ROUTING_KEY.withValue(context.getRoutingKey()),
        HighCardinalityTags.MESSAGING_DESTINATION_NAME.withValue(exchange(context.getExchange())),
        HighCardinalityTags.MESSAGING_SOURCE_NAME.withValue(context.getQueue()),
        HighCardinalityTags.MESSAGING_MESSAGE_PAYLOAD_SIZE_BYTES.withValue(
            String.valueOf(context.getPayloadSizeBytes())));
  }
}