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.apache.servicecomb.provider.springmvc.reference.async; import java.io.OutputStream; import java.net.URI; import java.util.concurrent.CompletableFuture; import org.apache.servicecomb.common.rest.RestConst; import org.apache.servicecomb.core.Invocation; import org.apache.servicecomb.core.provider.consumer.InvokerUtils; import org.apache.servicecomb.provider.springmvc.reference.CseClientHttpRequest; import org.apache.servicecomb.provider.springmvc.reference.CseClientHttpResponse; import org.apache.servicecomb.swagger.invocation.Response; import org.springframework.http.HttpMethod; import org.springframework.http.client.AsyncClientHttpRequest; import org.springframework.http.client.ClientHttpResponse; import org.springframework.util.concurrent.CompletableToListenableFutureAdapter; import org.springframework.util.concurrent.ListenableFuture; import io.netty.handler.codec.http.QueryStringDecoder; public class CseAsyncClientHttpRequest extends CseClientHttpRequest implements AsyncClientHttpRequest { CseAsyncClientHttpRequest() { } CseAsyncClientHttpRequest(URI uri, HttpMethod method) { this.setUri(uri); this.setMethod(method); } @Override public OutputStream getBody() { return null; } private ListenableFuture<ClientHttpResponse> invoke(Object[] args) { Invocation invocation = prepareInvocation(args); invocation.getHandlerContext().put(RestConst.CONSUMER_HEADER, this.getHeaders()); CompletableFuture<ClientHttpResponse> clientHttpResponseCompletableFuture = doAsyncInvoke(invocation); return new CompletableToListenableFutureAdapter<ClientHttpResponse>(clientHttpResponseCompletableFuture); } protected CompletableFuture<ClientHttpResponse> doAsyncInvoke(Invocation invocation) { CompletableFuture<ClientHttpResponse> completableFuture = new CompletableFuture<>(); InvokerUtils.reactiveInvoke(invocation, (Response response) -> { if (response.isSuccessed()) { completableFuture.complete(new CseClientHttpResponse(response)); } else { completableFuture.completeExceptionally(response.getResult()); } }); return completableFuture; } @Override public ListenableFuture<ClientHttpResponse> executeAsync() { this.setPath(findUriPath(this.getURI())); this.setRequestMeta(createRequestMeta(this.getMethod().name(), this.getURI())); QueryStringDecoder queryStringDecoder = new QueryStringDecoder(this.getURI().getRawSchemeSpecificPart()); this.setQueryParams(queryStringDecoder.parameters()); Object[] args = this.collectArguments(); return this.invoke(args); } }