io.prestosql.jdbc.$internal.okhttp3.internal.huc.BufferedRequestBody Maven / Gradle / Ivy
/*
* Copyright (C) 2016 Square, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package io.prestosql.jdbc.$internal.okhttp3.internal.huc;
import java.io.IOException;
import io.prestosql.jdbc.$internal.okhttp3.Request;
import io.prestosql.jdbc.$internal.okio.Buffer;
import io.prestosql.jdbc.$internal.okio.BufferedSink;
/**
* This request body involves an application thread only. First all bytes are written to the buffer.
* Only once that is complete are bytes then copied to the network.
*
* This body has two special powers. First, it can retransmit the same request body multiple
* times in order to recover from failures or cope with redirects. Second, it can compute the total
* length of the request body by measuring it after it has been written to the output stream.
*/
final class BufferedRequestBody extends OutputStreamRequestBody {
final Buffer buffer = new Buffer();
long contentLength = -1L;
BufferedRequestBody(long expectedContentLength) {
initOutputStream(buffer, expectedContentLength);
}
@Override public long contentLength() throws IOException {
return contentLength;
}
/**
* Now that we've buffered the entire request body, update the request headers and the body
* itself. This happens late to enable HttpURLConnection users to complete the socket connection
* before sending request body bytes.
*/
@Override public Request prepareToSendRequest(Request request) throws IOException {
if (request.header("Content-Length") != null) return request;
outputStream().close();
contentLength = buffer.size();
return request.newBuilder()
.removeHeader("Transfer-Encoding")
.header("Content-Length", Long.toString(buffer.size()))
.build();
}
@Override public void writeTo(BufferedSink sink) throws IOException {
buffer.copyTo(sink.buffer(), 0, buffer.size());
}
}