| /* |
| * ==================================================================== |
| * 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. |
| * ==================================================================== |
| * |
| * This software consists of voluntary contributions made by many |
| * individuals on behalf of the Apache Software Foundation. For more |
| * information on the Apache Software Foundation, please see |
| * <http://www.apache.org/>. |
| * |
| */ |
| |
| package org.apache.hc.core5.http.impl.nio; |
| |
| import java.io.IOException; |
| import java.nio.ByteBuffer; |
| import java.nio.channels.FileChannel; |
| import java.nio.channels.WritableByteChannel; |
| |
| import org.apache.hc.core5.http.impl.BasicHttpTransportMetrics; |
| import org.apache.hc.core5.http.nio.FileContentEncoder; |
| import org.apache.hc.core5.http.nio.SessionOutputBuffer; |
| |
| /** |
| * Content encoder that writes data without any transformation. The end of |
| * the content entity is demarcated by closing the underlying connection |
| * (EOF condition). Entities transferred using this input stream can be of |
| * unlimited length. |
| * <p> |
| * This decoder is optimized to transfer data directly from |
| * a {@link FileChannel} to the underlying I/O session's channel whenever |
| * possible avoiding intermediate buffering in the session buffer. |
| * |
| * @since 4.0 |
| */ |
| public class IdentityEncoder extends AbstractContentEncoder implements FileContentEncoder { |
| |
| private final int fragHint; |
| |
| /** |
| * @since 4.3 |
| * |
| * @param channel underlying channel. |
| * @param buffer session buffer. |
| * @param metrics transport metrics. |
| * @param chunkSizeHint fragment size hint defining an minimal size of a fragment |
| * that should be written out directly to the channel bypassing the session buffer. |
| * Value {@code 0} disables fragment buffering. |
| */ |
| public IdentityEncoder( |
| final WritableByteChannel channel, |
| final SessionOutputBuffer buffer, |
| final BasicHttpTransportMetrics metrics, |
| final int chunkSizeHint) { |
| super(channel, buffer, metrics); |
| this.fragHint = chunkSizeHint > 0 ? chunkSizeHint : 0; |
| } |
| |
| public IdentityEncoder( |
| final WritableByteChannel channel, |
| final SessionOutputBuffer buffer, |
| final BasicHttpTransportMetrics metrics) { |
| this(channel, buffer, metrics, 0); |
| } |
| |
| @Override |
| public int write(final ByteBuffer src) throws IOException { |
| if (src == null) { |
| return 0; |
| } |
| assertNotCompleted(); |
| |
| int total = 0; |
| while (src.hasRemaining()) { |
| if (this.buffer.hasData() || this.fragHint > 0) { |
| if (src.remaining() <= this.fragHint) { |
| final int capacity = this.fragHint - this.buffer.length(); |
| if (capacity > 0) { |
| final int limit = Math.min(capacity, src.remaining()); |
| final int bytesWritten = writeToBuffer(src, limit); |
| total += bytesWritten; |
| } |
| } |
| } |
| if (this.buffer.hasData()) { |
| if (this.buffer.length() >= this.fragHint || src.hasRemaining()) { |
| final int bytesWritten = flushToChannel(); |
| if (bytesWritten == 0) { |
| break; |
| } |
| } |
| } |
| if (!this.buffer.hasData() && src.remaining() > this.fragHint) { |
| final int bytesWritten = writeToChannel(src); |
| total += bytesWritten; |
| if (bytesWritten == 0) { |
| break; |
| } |
| } |
| } |
| return total; |
| } |
| |
| @Override |
| public long transfer( |
| final FileChannel src, |
| final long position, |
| final long count) throws IOException { |
| |
| if (src == null) { |
| return 0; |
| } |
| assertNotCompleted(); |
| |
| flushToChannel(); |
| if (this.buffer.hasData()) { |
| return 0; |
| } |
| |
| final long bytesWritten = src.transferTo(position, count, this.channel); |
| if (bytesWritten > 0) { |
| this.metrics.incrementBytesTransferred(bytesWritten); |
| } |
| return bytesWritten; |
| } |
| |
| @Override |
| public String toString() { |
| final StringBuilder sb = new StringBuilder(); |
| sb.append("[identity; completed: "); |
| sb.append(isCompleted()); |
| sb.append("]"); |
| return sb.toString(); |
| } |
| |
| } |