/*
* ====================================================================
* 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
* .
*
*/
package org.apache.hc.core5.http.impl.nio;
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.impl.nio.entity.SharedInputBuffer;
import org.apache.hc.core5.http.impl.nio.entity.SharedOutputBuffer;
import org.apache.hc.core5.http.message.BasicHttpResponse;
import org.apache.hc.core5.http.message.HttpResponseWrapper;
import org.apache.hc.core5.http.nio.HttpContextAware;
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.nio.entity.ContentInputStream;
import org.apache.hc.core5.http.nio.entity.ContentOutputStream;
import org.apache.hc.core5.http.protocol.HttpContext;
import org.apache.hc.core5.util.Args;
import org.apache.hc.core5.util.Asserts;
/**
* @since 5.0
*/
public abstract class AbstractClassicServerExchangeHandler implements HttpContextAware, AsyncServerExchangeHandler {
private enum State { IDLE, ACTIVE, COMPLETED }
private final int initialBufferSize;
private final Executor executor;
private final AtomicReference state;
private final AtomicReference exception;
private volatile HttpContext context;
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);
}
public Exception getException() {
return exception.get();
}
@Override
public void setContext(final HttpContext context) {
this.context = context;
}
protected abstract void handle(
HttpRequest request, InputStream requestStream,
HttpResponse response, OutputStream responseStream,
HttpContext context) throws IOException, HttpException;
@Override
public final void handleRequest(
final HttpRequest request,
final EntityDetails entityDetails,
final ResponseChannel responseChannel) throws HttpException, IOException {
if (entityDetails != null) {
final Header h = request.getFirstHeader(HttpHeaders.EXPECT);
if (h != null && "100-continue".equalsIgnoreCase(h.getValue())) {
responseChannel.sendInformation(new BasicHttpResponse(HttpStatus.SC_CONTINUE));
}
}
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 getTrailerNames() {
return null;
}
});
}
} catch (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);
if (inputStream != null) {
inputStream.close();
}
outputStream.close();
} catch (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 int consume(final ByteBuffer src) throws IOException {
Asserts.notNull(inputBuffer, "Input buffer");
return 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() {
}
}