org.springframework.http.client.AbstractBufferingAsyncClientHttpRequest Maven / Gradle / Ivy
/*
* Copyright 2002-2016 the original author or authors.
*
* 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 org.springframework.http.client;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import org.springframework.http.HttpHeaders;
import org.springframework.util.concurrent.ListenableFuture;
/**
* Base implementation of {@link AsyncClientHttpRequest} that buffers output
* in a byte array before sending it over the wire.
*
* @author Arjen Poutsma
* @since 4.0
*/
abstract class AbstractBufferingAsyncClientHttpRequest extends AbstractAsyncClientHttpRequest {
private ByteArrayOutputStream bufferedOutput = new ByteArrayOutputStream(1024);
@Override
protected OutputStream getBodyInternal(HttpHeaders headers) throws IOException {
return this.bufferedOutput;
}
@Override
protected ListenableFuture executeInternal(HttpHeaders headers) throws IOException {
byte[] bytes = this.bufferedOutput.toByteArray();
if (headers.getContentLength() < 0) {
headers.setContentLength(bytes.length);
}
ListenableFuture result = executeInternal(headers, bytes);
this.bufferedOutput = null;
return result;
}
/**
* Abstract template method that writes the given headers and content to the HTTP request.
* @param headers the HTTP headers
* @param bufferedOutput the body content
* @return the response object for the executed request
*/
protected abstract ListenableFuture executeInternal(
HttpHeaders headers, byte[] bufferedOutput) throws IOException;
}