Java tutorial
/* * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The ASF licenses this file to You 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 org.jclouds.azurecompute.arm.handlers; import javax.inject.Inject; import javax.inject.Singleton; import org.jclouds.http.HttpCommand; import org.jclouds.http.HttpResponse; import org.jclouds.http.handlers.RateLimitRetryHandler; import com.google.common.annotations.Beta; import com.google.common.base.Optional; import com.google.common.net.HttpHeaders; /** * Handles 429 Too Many Requests responses. * <p> * The Azure ARM provider also returns this 429 HTTP status code for some errors * when resources are busy or in a state where they cannot be modified. In this * case this handler delegates to the {@link AzureRetryableErrorHandler} to * determine if the requests can be retried. */ @Beta @Singleton public class AzureRateLimitRetryHandler extends RateLimitRetryHandler { private final AzureRetryableErrorHandler retryableErrorHandler; @Inject AzureRateLimitRetryHandler(AzureRetryableErrorHandler retryableErrorHandler) { this.retryableErrorHandler = retryableErrorHandler; } @Override protected boolean delayRequestUntilAllowed(HttpCommand command, HttpResponse response) { if (!isRateLimitError(response)) { return retryableErrorHandler.shouldRetryRequest(command, response); } return super.delayRequestUntilAllowed(command, response); } @Override protected Optional<Long> millisToNextAvailableRequest(HttpCommand command, HttpResponse response) { String secondsToNextAvailableRequest = response.getFirstHeaderOrNull(HttpHeaders.RETRY_AFTER); return secondsToNextAvailableRequest != null ? Optional.of(Long.parseLong(secondsToNextAvailableRequest) * 1000) : Optional.<Long>absent(); } public static boolean isRateLimitError(HttpResponse response) { return response.getFirstHeaderOrNull(HttpHeaders.RETRY_AFTER) != null; } }