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Java example source code file (Http2SettingsHandler.java)

This example Java source code file (Http2SettingsHandler.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

channelpromise, exception, http2settingshandler, illegalstateexception, override, simplechannelinboundhandler, threading, threads, timed, timeunit

The Http2SettingsHandler.java Java example source code

/*
 * 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);
    }
}

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