H2FullDuplexServerExample.java
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* distributed with this work for additional information
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* to you under the Apache License, Version 2.0 (the
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*
* http://www.apache.org/licenses/LICENSE-2.0
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* Unless required by applicable law or agreed to in writing,
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* KIND, either express or implied. See the License for the
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*
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package org.apache.hc.core5.http2.examples;
import java.io.IOException;
import java.net.InetSocketAddress;
import java.net.SocketException;
import java.nio.ByteBuffer;
import java.util.List;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;
import org.apache.hc.core5.http.EntityDetails;
import org.apache.hc.core5.http.Header;
import org.apache.hc.core5.http.HttpConnection;
import org.apache.hc.core5.http.HttpException;
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.URIScheme;
import org.apache.hc.core5.http.impl.bootstrap.HttpAsyncServer;
import org.apache.hc.core5.http.message.BasicHttpResponse;
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.http2.HttpVersionPolicy;
import org.apache.hc.core5.http2.config.H2Config;
import org.apache.hc.core5.http2.frame.RawFrame;
import org.apache.hc.core5.http2.impl.nio.H2StreamListener;
import org.apache.hc.core5.http2.impl.nio.bootstrap.H2ServerBootstrap;
import org.apache.hc.core5.io.CloseMode;
import org.apache.hc.core5.reactor.IOReactorConfig;
import org.apache.hc.core5.reactor.ListenerEndpoint;
import org.apache.hc.core5.util.TimeValue;
/**
* Example of full-duplex, streaming HTTP message exchanges with an asynchronous embedded HTTP/2 server.
*/
public class H2FullDuplexServerExample {
public static void main(final String[] args) throws Exception {
int port = 8080;
if (args.length >= 1) {
port = Integer.parseInt(args[0]);
}
final IOReactorConfig config = IOReactorConfig.custom()
.setSoTimeout(15, TimeUnit.SECONDS)
.setTcpNoDelay(true)
.build();
final H2Config h2Config = H2Config.custom()
.setPushEnabled(true)
.setMaxConcurrentStreams(100)
.build();
final HttpAsyncServer server = H2ServerBootstrap.bootstrap()
.setIOReactorConfig(config)
.setH2Config(h2Config)
.setVersionPolicy(HttpVersionPolicy.FORCE_HTTP_2)
.setStreamListener(new H2StreamListener() {
@Override
public void onHeaderInput(final HttpConnection connection, final int streamId, final List<? extends Header> headers) {
for (int i = 0; i < headers.size(); i++) {
System.out.println(connection.getRemoteAddress() + " (" + streamId + ") << " + headers.get(i));
}
}
@Override
public void onHeaderOutput(final HttpConnection connection, final int streamId, final List<? extends Header> headers) {
for (int i = 0; i < headers.size(); i++) {
System.out.println(connection.getRemoteAddress() + " (" + streamId + ") >> " + headers.get(i));
}
}
@Override
public void onFrameInput(final HttpConnection connection, final int streamId, final RawFrame frame) {
}
@Override
public void onFrameOutput(final HttpConnection connection, final int streamId, final RawFrame frame) {
}
@Override
public void onInputFlowControl(final HttpConnection connection, final int streamId, final int delta, final int actualSize) {
}
@Override
public void onOutputFlowControl(final HttpConnection connection, final int streamId, final int delta, final int actualSize) {
}
})
.register("/echo", () -> new AsyncServerExchangeHandler() {
ByteBuffer buffer = ByteBuffer.allocate(2048);
CapacityChannel inputCapacityChannel;
DataStreamChannel outputDataChannel;
boolean endStream;
private void ensureCapacity(final int chunk) {
if (buffer.remaining() < chunk) {
final ByteBuffer oldBuffer = buffer;
oldBuffer.flip();
buffer = ByteBuffer.allocate(oldBuffer.remaining() + (chunk > 2048 ? chunk : 2048));
buffer.put(oldBuffer);
}
}
@Override
public void handleRequest(
final HttpRequest request,
final EntityDetails entityDetails,
final ResponseChannel responseChannel,
final HttpContext context) throws HttpException, IOException {
final HttpResponse response = new BasicHttpResponse(HttpStatus.SC_OK);
responseChannel.sendResponse(response, entityDetails, context);
}
@Override
public void consume(final ByteBuffer src) throws IOException {
if (buffer.position() == 0) {
if (outputDataChannel != null) {
outputDataChannel.write(src);
}
}
if (src.hasRemaining()) {
ensureCapacity(src.remaining());
buffer.put(src);
if (outputDataChannel != null) {
outputDataChannel.requestOutput();
}
}
}
@Override
public void updateCapacity(final CapacityChannel capacityChannel) throws IOException {
if (buffer.hasRemaining()) {
capacityChannel.update(buffer.remaining());
inputCapacityChannel = null;
} else {
inputCapacityChannel = capacityChannel;
}
}
@Override
public void streamEnd(final List<? extends Header> trailers) throws IOException {
endStream = true;
if (buffer.position() == 0) {
if (outputDataChannel != null) {
outputDataChannel.endStream();
}
} else {
if (outputDataChannel != null) {
outputDataChannel.requestOutput();
}
}
}
@Override
public int available() {
return buffer.position();
}
@Override
public void produce(final DataStreamChannel channel) throws IOException {
outputDataChannel = channel;
buffer.flip();
if (buffer.hasRemaining()) {
channel.write(buffer);
}
buffer.compact();
if (buffer.position() == 0 && endStream) {
channel.endStream();
}
final CapacityChannel capacityChannel = inputCapacityChannel;
if (capacityChannel != null && buffer.hasRemaining()) {
capacityChannel.update(buffer.remaining());
}
}
@Override
public void failed(final Exception cause) {
if (!(cause instanceof SocketException)) {
cause.printStackTrace(System.out);
}
}
@Override
public void releaseResources() {
}
})
.create();
Runtime.getRuntime().addShutdownHook(new Thread(() -> {
System.out.println("HTTP server shutting down");
server.close(CloseMode.GRACEFUL);
}));
server.start();
final Future<ListenerEndpoint> future = server.listen(new InetSocketAddress(port), URIScheme.HTTP);
final ListenerEndpoint listenerEndpoint = future.get();
System.out.print("Listening on " + listenerEndpoint.getAddress());
server.awaitShutdown(TimeValue.ofDays(Long.MAX_VALUE));
}
}