| /* |
| * ==================================================================== |
| * 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.support.classic; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.UnsupportedEncodingException; |
| import java.nio.ByteBuffer; |
| import java.nio.charset.UnsupportedCharsetException; |
| import java.util.List; |
| import java.util.concurrent.Executor; |
| import java.util.concurrent.atomic.AtomicReference; |
| |
| import org.apache.hc.core5.concurrent.FutureCallback; |
| import org.apache.hc.core5.http.ContentType; |
| import org.apache.hc.core5.http.EntityDetails; |
| import org.apache.hc.core5.http.Header; |
| import org.apache.hc.core5.http.HttpException; |
| import org.apache.hc.core5.http.nio.AsyncEntityConsumer; |
| import org.apache.hc.core5.http.nio.CapacityChannel; |
| import org.apache.hc.core5.util.Args; |
| |
| /** |
| * {@link AsyncEntityConsumer} implementation that acts as a compatibility |
| * layer for classic {@link InputStream} based interfaces. Blocking input |
| * processing is executed through an {@link Executor}. |
| * |
| * @param <T> entity representation. |
| * |
| * @since 5.0 |
| */ |
| public abstract class AbstractClassicEntityConsumer<T> implements AsyncEntityConsumer<T> { |
| |
| private enum State { IDLE, ACTIVE, COMPLETED } |
| |
| private final Executor executor; |
| private final SharedInputBuffer buffer; |
| private final AtomicReference<State> state; |
| private final AtomicReference<T> resultRef; |
| private final AtomicReference<Exception> exceptionRef; |
| |
| public AbstractClassicEntityConsumer(final int initialBufferSize, final Executor executor) { |
| this.executor = Args.notNull(executor, "Executor"); |
| this.buffer = new SharedInputBuffer(initialBufferSize); |
| this.state = new AtomicReference<>(State.IDLE); |
| this.resultRef = new AtomicReference<>(null); |
| this.exceptionRef = new AtomicReference<>(null); |
| } |
| |
| /** |
| * Processes entity data from the given stream. |
| * |
| * @param contentType the entity content type |
| * @param inputStream the input stream |
| * @return the result of entity processing. |
| */ |
| protected abstract T consumeData(ContentType contentType, InputStream inputStream) throws IOException; |
| |
| @Override |
| public final void updateCapacity(final CapacityChannel capacityChannel) throws IOException { |
| buffer.updateCapacity(capacityChannel); |
| } |
| |
| @Override |
| public final void streamStart(final EntityDetails entityDetails, final FutureCallback<T> resultCallback) throws HttpException, IOException { |
| final ContentType contentType; |
| try { |
| contentType = ContentType.parse(entityDetails.getContentType()); |
| } catch (final UnsupportedCharsetException ex) { |
| throw new UnsupportedEncodingException(ex.getMessage()); |
| } |
| if (state.compareAndSet(State.IDLE, State.ACTIVE)) { |
| executor.execute(() -> { |
| try { |
| final T result = consumeData(contentType, new ContentInputStream(buffer)); |
| resultRef.set(result); |
| resultCallback.completed(result); |
| } catch (final Exception ex) { |
| buffer.abort(); |
| resultCallback.failed(ex); |
| } finally { |
| state.set(State.COMPLETED); |
| } |
| }); |
| } |
| } |
| |
| @Override |
| public final void consume(final ByteBuffer src) throws IOException { |
| buffer.fill(src); |
| } |
| |
| @Override |
| public final void streamEnd(final List<? extends Header> trailers) throws HttpException, IOException { |
| buffer.markEndStream(); |
| } |
| |
| @Override |
| public final void failed(final Exception cause) { |
| if (exceptionRef.compareAndSet(null, cause)) { |
| releaseResources(); |
| } |
| } |
| |
| public final Exception getException() { |
| return exceptionRef.get(); |
| } |
| |
| @Override |
| public final T getContent() { |
| return resultRef.get(); |
| } |
| |
| @Override |
| public void releaseResources() { |
| } |
| |
| } |