781a85520c
Motivation: Adding an example that showcases Netty’s HTTP/2 codec and that is slightly more complex than the existing hello-world example. It is based on the Gopher tiles example available here: https://http2.golang.org/gophertiles?latency=0 Modifications: Moved current http2 example to http2/helloworld. Added http2 tiles example under http2/tiles. Result: A Netty tiles example is available.
64 lines
2.2 KiB
Java
64 lines
2.2 KiB
Java
/*
|
|
* Copyright 2014 The Netty Project
|
|
*
|
|
* The Netty Project 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.
|
|
*/
|
|
package io.netty.example.http2.helloworld.client;
|
|
|
|
import io.netty.channel.ChannelHandlerContext;
|
|
import io.netty.channel.ChannelPromise;
|
|
import io.netty.channel.SimpleChannelInboundHandler;
|
|
import io.netty.handler.codec.http2.Http2Settings;
|
|
|
|
import java.util.concurrent.TimeUnit;
|
|
|
|
/**
|
|
* Reads the first {@link Http2Settings} object and notifies a {@link io.netty.channel.ChannelPromise}
|
|
*/
|
|
public class Http2SettingsHandler extends SimpleChannelInboundHandler<Http2Settings> {
|
|
private ChannelPromise promise;
|
|
|
|
/**
|
|
* Create new instance
|
|
*
|
|
* @param promise Promise object used to notify when first settings are received
|
|
*/
|
|
public Http2SettingsHandler(ChannelPromise promise) {
|
|
this.promise = promise;
|
|
}
|
|
|
|
/**
|
|
* Wait for this handler to be added after the upgrade to HTTP/2, and for initial preface
|
|
* handshake to complete.
|
|
*
|
|
* @param timeout Time to wait
|
|
* @param unit {@link java.util.concurrent.TimeUnit} for {@code timeout}
|
|
* @throws Exception if timeout or other failure occurs
|
|
*/
|
|
public void awaitSettings(long timeout, TimeUnit unit) throws Exception {
|
|
if (!promise.awaitUninterruptibly(timeout, unit)) {
|
|
throw new IllegalStateException("Timed out waiting for settings");
|
|
}
|
|
if (!promise.isSuccess()) {
|
|
throw new RuntimeException(promise.cause());
|
|
}
|
|
}
|
|
|
|
@Override
|
|
protected void channelRead0(ChannelHandlerContext ctx, Http2Settings msg) throws Exception {
|
|
promise.setSuccess();
|
|
|
|
// Only care about the first settings message
|
|
ctx.pipeline().remove(this);
|
|
}
|
|
}
|