Java tutorial
/* * 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 ccwihr.client.t2; 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); } }