| /* |
| * ==================================================================== |
| * 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.nio.entity; |
| |
| import java.io.IOException; |
| import java.nio.ByteBuffer; |
| import java.util.Set; |
| |
| import org.apache.hc.core5.annotation.Contract; |
| import org.apache.hc.core5.annotation.ThreadingBehavior; |
| import org.apache.hc.core5.http.ContentType; |
| import org.apache.hc.core5.http.nio.AsyncEntityProducer; |
| import org.apache.hc.core5.http.nio.DataStreamChannel; |
| import org.apache.hc.core5.http.nio.StreamChannel; |
| import org.apache.hc.core5.util.Args; |
| |
| /** |
| * Abstract binary entity content producer. |
| * |
| * @since 5.0 |
| */ |
| @Contract(threading = ThreadingBehavior.SAFE_CONDITIONAL) |
| public abstract class AbstractBinAsyncEntityProducer implements AsyncEntityProducer { |
| |
| enum State { ACTIVE, FLUSHING, END_STREAM } |
| |
| private final int fragmentSizeHint; |
| private final ByteBuffer bytebuf; |
| private final ContentType contentType; |
| |
| private volatile State state; |
| |
| public AbstractBinAsyncEntityProducer(final int fragmentSizeHint, final ContentType contentType) { |
| this.fragmentSizeHint = fragmentSizeHint >= 0 ? fragmentSizeHint : 0; |
| this.bytebuf = ByteBuffer.allocate(this.fragmentSizeHint); |
| this.contentType = contentType; |
| this.state = State.ACTIVE; |
| } |
| |
| private void flush(final StreamChannel<ByteBuffer> channel) throws IOException { |
| if (bytebuf.position() > 0) { |
| bytebuf.flip(); |
| channel.write(bytebuf); |
| bytebuf.compact(); |
| } |
| } |
| |
| final int writeData(final StreamChannel<ByteBuffer> channel, final ByteBuffer src) throws IOException { |
| final int chunk = src.remaining(); |
| if (chunk == 0) { |
| return 0; |
| } |
| if (chunk > fragmentSizeHint) { |
| // the data chunk is greater than the fragment hint |
| // attempt to write it out to the channel directly |
| |
| // flush the buffer if not empty |
| flush(channel); |
| if (bytebuf.position() == 0) { |
| return channel.write(src); |
| } |
| } else { |
| // the data chunk is smaller than the fragment hint |
| // attempt to buffer it |
| |
| // flush the buffer if there is not enough space to store the chunk |
| if (bytebuf.remaining() < chunk) { |
| flush(channel); |
| } |
| if (bytebuf.remaining() >= chunk) { |
| bytebuf.put(src); |
| if (!bytebuf.hasRemaining()) { |
| flush(channel); |
| } |
| return chunk; |
| } |
| } |
| return 0; |
| } |
| |
| final void streamEnd(final StreamChannel<ByteBuffer> channel) throws IOException { |
| if (state == State.ACTIVE) { |
| state = State.FLUSHING; |
| flush(channel); |
| if (bytebuf.position() == 0) { |
| state = State.END_STREAM; |
| channel.endStream(); |
| } |
| } |
| } |
| |
| /** |
| * Returns the number of bytes immediately available for output. |
| * This method can be used as a hint to control output events |
| * of the underlying I/O session. |
| * |
| * @return the number of bytes immediately available for output |
| */ |
| protected abstract int availableData(); |
| |
| /** |
| * Triggered to signal the ability of the underlying byte channel |
| * to accept more data. The data producer can choose to write data |
| * immediately inside the call or asynchronously at some later point. |
| * <p> |
| * {@link StreamChannel} passed to this method is threading-safe. |
| * |
| * @param channel the data channel capable to accepting more data. |
| */ |
| protected abstract void produceData(StreamChannel<ByteBuffer> channel) throws IOException; |
| |
| @Override |
| public final String getContentType() { |
| return contentType != null ? contentType.toString() : null; |
| } |
| |
| @Override |
| public String getContentEncoding() { |
| return null; |
| } |
| |
| @Override |
| public boolean isChunked() { |
| return false; |
| } |
| |
| @Override |
| public Set<String> getTrailerNames() { |
| return null; |
| } |
| |
| @Override |
| public long getContentLength() { |
| return -1; |
| } |
| |
| @Override |
| public final int available() { |
| if (state == State.ACTIVE) { |
| return availableData(); |
| } else { |
| synchronized (bytebuf) { |
| return bytebuf.position(); |
| } |
| } |
| } |
| |
| @Override |
| public final void produce(final DataStreamChannel channel) throws IOException { |
| synchronized (bytebuf) { |
| if (state == State.ACTIVE) { |
| produceData(new StreamChannel<ByteBuffer>() { |
| |
| @Override |
| public int write(final ByteBuffer src) throws IOException { |
| Args.notNull(src, "Buffer"); |
| synchronized (bytebuf) { |
| return writeData(channel, src); |
| } |
| } |
| |
| @Override |
| public void endStream() throws IOException { |
| synchronized (bytebuf) { |
| streamEnd(channel); |
| } |
| } |
| |
| }); |
| } |
| if (state == State.FLUSHING) { |
| flush(channel); |
| if (bytebuf.position() == 0) { |
| state = State.END_STREAM; |
| channel.endStream(); |
| } |
| } |
| } |
| } |
| |
| @Override |
| public void releaseResources() { |
| state = State.ACTIVE; |
| } |
| |
| } |