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The RabbitMQ AMQP 1.0 Java client library defines an API to access RabbitMQ
with the AMQP 1.0 protocol.
// 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 static java.lang.String.format;
import com.rabbitmq.client.amqp.AmqpException;
import com.rabbitmq.client.amqp.BackOffDelayPolicy;
import java.time.Duration;
import java.util.List;
import java.util.concurrent.Callable;
import java.util.function.Predicate;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
abstract class RetryUtils {
private static final Logger LOGGER = LoggerFactory.getLogger(RetryUtils.class);
private RetryUtils() {}
static T callAndMaybeRetry(
Callable operation,
Predicate retryCondition,
List waitTimes,
String format,
Object... args) {
return callAndMaybeRetry(
operation,
retryCondition,
i -> i > waitTimes.size() ? BackOffDelayPolicy.TIMEOUT : waitTimes.get(i - 1),
format,
args);
}
static T callAndMaybeRetry(
Callable operation,
Predicate retryCondition,
Duration waitTime,
int attempts,
String format,
Object... args) {
return callAndMaybeRetry(
operation,
retryCondition,
i -> i > attempts ? BackOffDelayPolicy.TIMEOUT : waitTime,
format,
args);
}
static T callAndMaybeRetry(
Callable operation,
Predicate retryCondition,
BackOffDelayPolicy delayPolicy,
String format,
Object... args) {
String description = format(format, args);
int attempt = 0;
Exception lastException = null;
long startTime = System.nanoTime();
boolean keepTrying = true;
while (keepTrying) {
try {
attempt++;
LOGGER.debug("Starting attempt #{} for operation '{}'", attempt, description);
T result = operation.call();
Duration operationDuration = Duration.ofNanos(System.nanoTime() - startTime);
LOGGER.debug(
"Operation '{}' completed in {} ms after {} attempt(s)",
description,
operationDuration.toMillis(),
attempt);
return result;
} catch (Exception e) {
lastException = e;
if (retryCondition.test(e)) {
LOGGER.debug("Operation '{}' failed, retrying...", description);
Duration delay = delayPolicy.delay(attempt);
if (BackOffDelayPolicy.TIMEOUT.equals(delay)) {
keepTrying = false;
} else if (!delay.isZero()) {
try {
Thread.sleep(delay.toMillis());
} catch (InterruptedException ex) {
Thread.currentThread().interrupt();
lastException = ex;
keepTrying = false;
}
}
} else {
keepTrying = false;
}
}
}
String message =
format(
"Could not complete task '%s' after %d attempt(s) (reason: %s)",
description, attempt, exceptionMessage(lastException));
LOGGER.debug(message);
if (lastException instanceof RuntimeException) {
throw (RuntimeException) lastException;
} else {
throw new AmqpException(message, lastException);
}
}
static String exceptionMessage(Exception e) {
if (e == null) {
return "unknown";
} else if (e.getMessage() == null) {
return e.getClass().getSimpleName();
} else {
return e.getMessage() + " [" + e.getClass().getSimpleName() + "]";
}
}
}