| /* |
| * ==================================================================== |
| * 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.OutputStream; |
| import java.nio.ByteBuffer; |
| import java.util.List; |
| import java.util.Locale; |
| import java.util.Set; |
| import java.util.concurrent.Executor; |
| import java.util.concurrent.atomic.AtomicBoolean; |
| import java.util.concurrent.atomic.AtomicReference; |
| |
| 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.HttpHeaders; |
| import org.apache.hc.core5.http.HttpRequest; |
| import org.apache.hc.core5.http.HttpResponse; |
| import org.apache.hc.core5.http.HttpStatus; |
| import org.apache.hc.core5.http.ProtocolVersion; |
| import org.apache.hc.core5.http.message.BasicHttpResponse; |
| import org.apache.hc.core5.http.message.HttpResponseWrapper; |
| import org.apache.hc.core5.http.nio.AsyncServerExchangeHandler; |
| import org.apache.hc.core5.http.nio.CapacityChannel; |
| import org.apache.hc.core5.http.nio.DataStreamChannel; |
| import org.apache.hc.core5.http.nio.ResponseChannel; |
| import org.apache.hc.core5.http.protocol.HttpContext; |
| import org.apache.hc.core5.io.Closer; |
| import org.apache.hc.core5.util.Args; |
| import org.apache.hc.core5.util.Asserts; |
| |
| /** |
| * {@link AsyncServerExchangeHandler} implementation that acts as a compatibility |
| * layer for classic {@link InputStream} / {@link OutputStream} based interfaces. |
| * Blocking input / output processing is executed through an {@link Executor}. |
| * |
| * @since 5.0 |
| */ |
| public abstract class AbstractClassicServerExchangeHandler implements AsyncServerExchangeHandler { |
| |
| private enum State { IDLE, ACTIVE, COMPLETED } |
| |
| private final int initialBufferSize; |
| private final Executor executor; |
| private final AtomicReference<State> state; |
| private final AtomicReference<Exception> exception; |
| |
| private volatile SharedInputBuffer inputBuffer; |
| private volatile SharedOutputBuffer outputBuffer; |
| |
| public AbstractClassicServerExchangeHandler(final int initialBufferSize, final Executor executor) { |
| this.initialBufferSize = Args.positive(initialBufferSize, "Initial buffer size"); |
| this.executor = Args.notNull(executor, "Executor"); |
| this.exception = new AtomicReference<>(null); |
| this.state = new AtomicReference<>(State.IDLE); |
| } |
| |
| /** |
| * Handles an incoming request optionally reading its entity content form the given input stream |
| * and generates a response optionally writing out its entity content into the given output stream. |
| * |
| * @param request the incoming request |
| * @param requestStream the request stream if the request encloses an entity, |
| * {@code null} otherwise. |
| * @param response the outgoing response. |
| * @param responseStream the response entity output stream. |
| * @param context the actual execution context. |
| */ |
| protected abstract void handle( |
| HttpRequest request, InputStream requestStream, |
| HttpResponse response, OutputStream responseStream, |
| HttpContext context) throws IOException, HttpException; |
| |
| public Exception getException() { |
| return exception.get(); |
| } |
| |
| @Override |
| public final void handleRequest( |
| final HttpRequest request, |
| final EntityDetails entityDetails, |
| final ResponseChannel responseChannel, |
| final HttpContext context) throws HttpException, IOException { |
| final AtomicBoolean responseCommitted = new AtomicBoolean(false); |
| |
| final HttpResponse response = new BasicHttpResponse(HttpStatus.SC_OK); |
| final HttpResponse responseWrapper = new HttpResponseWrapper(response){ |
| |
| private void ensureNotCommitted() { |
| Asserts.check(!responseCommitted.get(), "Response already committed"); |
| } |
| |
| @Override |
| public void addHeader(final String name, final Object value) { |
| ensureNotCommitted(); |
| super.addHeader(name, value); |
| } |
| |
| @Override |
| public void setHeader(final String name, final Object value) { |
| ensureNotCommitted(); |
| super.setHeader(name, value); |
| } |
| |
| @Override |
| public void setVersion(final ProtocolVersion version) { |
| ensureNotCommitted(); |
| super.setVersion(version); |
| } |
| |
| @Override |
| public void setCode(final int code) { |
| ensureNotCommitted(); |
| super.setCode(code); |
| } |
| |
| @Override |
| public void setReasonPhrase(final String reason) { |
| ensureNotCommitted(); |
| super.setReasonPhrase(reason); |
| } |
| |
| @Override |
| public void setLocale(final Locale locale) { |
| ensureNotCommitted(); |
| super.setLocale(locale); |
| } |
| |
| }; |
| |
| final InputStream inputStream; |
| if (entityDetails != null) { |
| inputBuffer = new SharedInputBuffer(initialBufferSize); |
| inputStream = new ContentInputStream(inputBuffer); |
| } else { |
| inputStream = null; |
| } |
| outputBuffer = new SharedOutputBuffer(initialBufferSize); |
| |
| final OutputStream outputStream = new ContentOutputStream(outputBuffer) { |
| |
| private void triggerResponse() throws IOException { |
| try { |
| if (responseCommitted.compareAndSet(false, true)) { |
| responseChannel.sendResponse(response, new EntityDetails() { |
| |
| @Override |
| public long getContentLength() { |
| return -1; |
| } |
| |
| @Override |
| public String getContentType() { |
| final Header h = response.getFirstHeader(HttpHeaders.CONTENT_TYPE); |
| return h != null ? h.getValue() : null; |
| } |
| |
| @Override |
| public String getContentEncoding() { |
| final Header h = response.getFirstHeader(HttpHeaders.CONTENT_ENCODING); |
| return h != null ? h.getValue() : null; |
| } |
| |
| @Override |
| public boolean isChunked() { |
| return false; |
| } |
| |
| @Override |
| public Set<String> getTrailerNames() { |
| return null; |
| } |
| |
| }, context); |
| } |
| } catch (final HttpException ex) { |
| throw new IOException(ex.getMessage(), ex); |
| } |
| } |
| |
| @Override |
| public void close() throws IOException { |
| triggerResponse(); |
| super.close(); |
| } |
| |
| @Override |
| public void write(final byte[] b, final int off, final int len) throws IOException { |
| triggerResponse(); |
| super.write(b, off, len); |
| } |
| |
| @Override |
| public void write(final byte[] b) throws IOException { |
| triggerResponse(); |
| super.write(b); |
| } |
| |
| @Override |
| public void write(final int b) throws IOException { |
| triggerResponse(); |
| super.write(b); |
| } |
| |
| }; |
| |
| if (state.compareAndSet(State.IDLE, State.ACTIVE)) { |
| executor.execute(new Runnable() { |
| |
| @Override |
| public void run() { |
| try { |
| handle(request, inputStream, responseWrapper, outputStream, context); |
| Closer.close(inputStream); |
| outputStream.close(); |
| } catch (final Exception ex) { |
| exception.compareAndSet(null, ex); |
| if (inputBuffer != null) { |
| inputBuffer.abort(); |
| } |
| outputBuffer.abort(); |
| } finally { |
| state.set(State.COMPLETED); |
| } |
| } |
| |
| }); |
| } |
| } |
| |
| @Override |
| public final void updateCapacity(final CapacityChannel capacityChannel) throws IOException { |
| if (inputBuffer != null) { |
| inputBuffer.updateCapacity(capacityChannel); |
| } |
| } |
| |
| @Override |
| public final void consume(final ByteBuffer src) throws IOException { |
| Asserts.notNull(inputBuffer, "Input buffer"); |
| inputBuffer.fill(src); |
| } |
| |
| @Override |
| public final void streamEnd(final List<? extends Header> trailers) throws HttpException, IOException { |
| Asserts.notNull(inputBuffer, "Input buffer"); |
| inputBuffer.markEndStream(); |
| } |
| |
| @Override |
| public final int available() { |
| Asserts.notNull(outputBuffer, "Output buffer"); |
| return outputBuffer.length(); |
| } |
| |
| @Override |
| public final void produce(final DataStreamChannel channel) throws IOException { |
| Asserts.notNull(outputBuffer, "Output buffer"); |
| outputBuffer.flush(channel); |
| } |
| |
| @Override |
| public final void failed(final Exception cause) { |
| exception.compareAndSet(null, cause); |
| releaseResources(); |
| } |
| |
| @Override |
| public void releaseResources() { |
| } |
| |
| } |