1 /* 2 * Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved. 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"). 5 * You may not use this file except in compliance with the License. 6 * A copy of the License is located at 7 * 8 * http://aws.amazon.com/apache2.0 9 * 10 * or in the "license" file accompanying this file. This file is distributed 11 * on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either 12 * express or implied. See the License for the specific language governing 13 * permissions and limitations under the License. 14 */ 15 16 package software.amazon.awssdk.core.internal.http.loader; 17 18 import software.amazon.awssdk.annotations.SdkInternalApi; 19 import software.amazon.awssdk.core.exception.SdkClientException; 20 import software.amazon.awssdk.http.SdkHttpClient; 21 import software.amazon.awssdk.http.async.SdkAsyncHttpClient; 22 import software.amazon.awssdk.http.async.SdkAsyncHttpService; 23 import software.amazon.awssdk.utils.AttributeMap; 24 25 /** 26 * Utility to load the default HTTP client factory and create an instance of {@link SdkHttpClient}. 27 */ 28 @SdkInternalApi 29 public final class DefaultSdkAsyncHttpClientBuilder implements SdkAsyncHttpClient.Builder { 30 31 private static final SdkHttpServiceProvider<SdkAsyncHttpService> DEFAULT_CHAIN = new CachingSdkHttpServiceProvider<>( 32 new SdkHttpServiceProviderChain<>( 33 SystemPropertyHttpServiceProvider.asyncProvider(), 34 ClasspathSdkHttpServiceProvider.asyncProvider() 35 )); 36 37 @Override buildWithDefaults(AttributeMap serviceDefaults)38 public SdkAsyncHttpClient buildWithDefaults(AttributeMap serviceDefaults) { 39 // TODO We create and build every time. Do we want to cache it instead of the service binding? 40 return DEFAULT_CHAIN 41 .loadService() 42 .map(SdkAsyncHttpService::createAsyncHttpClientFactory) 43 .map(f -> f.buildWithDefaults(serviceDefaults)) 44 .orElseThrow( 45 () -> SdkClientException.builder() 46 .message("Unable to load an HTTP implementation from any provider in the " + 47 "chain. You must declare a dependency on an appropriate HTTP " + 48 "implementation or pass in an SdkHttpClient explicitly to the " + 49 "client builder.") 50 .build()); 51 } 52 53 } 54