com.hazelcast.kubernetes.RetryUtils Maven / Gradle / Ivy
/*
* Copyright (c) 2008-2020, Hazelcast, Inc. All Rights Reserved.
*
* 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.
*/
package com.hazelcast.kubernetes;
import com.hazelcast.core.HazelcastException;
import com.hazelcast.logging.ILogger;
import com.hazelcast.logging.Logger;
import java.util.List;
import java.util.concurrent.Callable;
/**
* Static utility class to retry operations related to connecting to Kubernetes master.
*/
final class RetryUtils {
static final long INITIAL_BACKOFF_MS = 1500L;
static final long MAX_BACKOFF_MS = 5 * 60 * 1000L;
static final double BACKOFF_MULTIPLIER = 1.5;
private static final ILogger LOGGER = Logger.getLogger(RetryUtils.class);
private static final long MS_IN_SECOND = 1000L;
private RetryUtils() {
}
/**
* Calls {@code callable.call()} until it does not throw an exception (but no more than {@code retries} times).
*
* Note that {@code callable} should be an idempotent operation which is a call to the Kubernetes master.
*
* If {@code callable} throws an unchecked exception, it is wrapped into {@link HazelcastException}.
*/
public static T retry(Callable callable, int retries, List nonRetryableKeywords) {
int retryCount = 0;
while (true) {
try {
return callable.call();
} catch (Exception e) {
retryCount++;
if (retryCount > retries || containsAnyOf(e, nonRetryableKeywords)) {
throw unchecked(e);
}
long waitIntervalMs = backoffIntervalForRetry(retryCount);
LOGGER.warning(
String.format("Couldn't discover Hazelcast members using Kubernetes API, [%s] retrying in %s seconds...",
retryCount, waitIntervalMs / MS_IN_SECOND));
sleep(waitIntervalMs);
}
}
}
private static RuntimeException unchecked(Exception e) {
if (e instanceof RuntimeException) {
return (RuntimeException) e;
}
return new HazelcastException(e);
}
private static boolean containsAnyOf(Exception e, List nonRetryableKeywords) {
Throwable currentException = e;
while (currentException != null) {
String exceptionMessage = currentException.getMessage();
for (String keyword : nonRetryableKeywords) {
if (exceptionMessage != null && exceptionMessage.contains(keyword)) {
return true;
}
}
currentException = currentException.getCause();
}
return false;
}
private static long backoffIntervalForRetry(int retryCount) {
long result = INITIAL_BACKOFF_MS;
for (int i = 1; i < retryCount; i++) {
result *= BACKOFF_MULTIPLIER;
if (result > MAX_BACKOFF_MS) {
return MAX_BACKOFF_MS;
}
}
return result;
}
private static void sleep(long millis) {
try {
Thread.sleep(millis);
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
throw new HazelcastException(e);
}
}
}