223 lines
6.3 KiB
Java
223 lines
6.3 KiB
Java
/*
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* Copyright 2016 The Netty Project
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*
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* The Netty Project licenses this file to you under the Apache License,
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* version 2.0 (the "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*/
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package io.netty.handler.codec.http2;
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import io.netty.channel.Channel;
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import io.netty.channel.ChannelDuplexHandler;
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import io.netty.channel.ChannelHandlerContext;
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import io.netty.channel.embedded.EmbeddedChannel;
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import io.netty.util.ReferenceCountUtil;
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import io.netty.util.internal.PlatformDependent;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.concurrent.locks.LockSupport;
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import static io.netty.util.internal.ObjectUtil.checkNotNull;
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import static java.util.concurrent.TimeUnit.MILLISECONDS;
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/**
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* Channel handler that allows to easily access inbound messages.
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*/
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public class LastInboundHandler extends ChannelDuplexHandler {
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private final List<Object> queue = new ArrayList<>();
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private final Consumer<ChannelHandlerContext> channelReadCompleteConsumer;
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private Throwable lastException;
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private ChannelHandlerContext ctx;
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private boolean channelActive;
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private String writabilityStates = "";
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// TODO(scott): use JDK 8's Consumer
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public interface Consumer<T> {
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void accept(T obj);
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}
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private static final Consumer<Object> NOOP_CONSUMER = new Consumer<Object>() {
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@Override
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public void accept(Object obj) {
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}
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};
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@SuppressWarnings("unchecked")
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public static <T> Consumer<T> noopConsumer() {
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return (Consumer<T>) NOOP_CONSUMER;
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}
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public LastInboundHandler() {
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this(LastInboundHandler.noopConsumer());
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}
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public LastInboundHandler(Consumer<ChannelHandlerContext> channelReadCompleteConsumer) {
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this.channelReadCompleteConsumer = checkNotNull(channelReadCompleteConsumer, "channelReadCompleteConsumer");
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}
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@Override
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public void handlerAdded(ChannelHandlerContext ctx) throws Exception {
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super.handlerAdded(ctx);
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this.ctx = ctx;
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}
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@Override
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public void channelActive(ChannelHandlerContext ctx) throws Exception {
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if (channelActive) {
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throw new IllegalStateException("channelActive may only be fired once.");
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}
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channelActive = true;
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super.channelActive(ctx);
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}
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public boolean isChannelActive() {
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return channelActive;
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}
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public String writabilityStates() {
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return writabilityStates;
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}
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@Override
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public void channelInactive(ChannelHandlerContext ctx) throws Exception {
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if (!channelActive) {
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throw new IllegalStateException("channelInactive may only be fired once after channelActive.");
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}
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channelActive = false;
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super.channelInactive(ctx);
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}
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@Override
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public void channelWritabilityChanged(ChannelHandlerContext ctx) throws Exception {
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if (writabilityStates == "") {
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writabilityStates = String.valueOf(ctx.channel().isWritable());
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} else {
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writabilityStates += "," + ctx.channel().isWritable();
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}
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super.channelWritabilityChanged(ctx);
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}
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@Override
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public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
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queue.add(msg);
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}
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@Override
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public void channelReadComplete(ChannelHandlerContext ctx) throws Exception {
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channelReadCompleteConsumer.accept(ctx);
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}
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@Override
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public void userEventTriggered(ChannelHandlerContext ctx, Object evt) throws Exception {
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queue.add(new UserEvent(evt));
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}
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@Override
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public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
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if (lastException != null) {
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cause.printStackTrace();
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} else {
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lastException = cause;
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}
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}
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public void checkException() throws Exception {
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if (lastException == null) {
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return;
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}
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Throwable t = lastException;
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lastException = null;
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PlatformDependent.throwException(t);
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}
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@SuppressWarnings("unchecked")
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public <T> T readInbound() {
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for (int i = 0; i < queue.size(); i++) {
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Object o = queue.get(i);
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if (!(o instanceof UserEvent)) {
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queue.remove(i);
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return (T) o;
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}
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}
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return null;
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}
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public <T> T blockingReadInbound() {
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T msg;
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while ((msg = readInbound()) == null) {
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LockSupport.parkNanos(MILLISECONDS.toNanos(10));
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}
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return msg;
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}
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@SuppressWarnings("unchecked")
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public <T> T readUserEvent() {
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for (int i = 0; i < queue.size(); i++) {
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Object o = queue.get(i);
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if (o instanceof UserEvent) {
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queue.remove(i);
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return (T) ((UserEvent) o).evt;
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}
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}
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return null;
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}
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/**
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* Useful to test order of events and messages.
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*/
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@SuppressWarnings("unchecked")
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public <T> T readInboundMessageOrUserEvent() {
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if (queue.isEmpty()) {
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return null;
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}
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Object o = queue.remove(0);
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if (o instanceof UserEvent) {
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return (T) ((UserEvent) o).evt;
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}
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return (T) o;
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}
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public void writeOutbound(Object... msgs) throws Exception {
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for (Object msg : msgs) {
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ctx.write(msg);
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}
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ctx.flush();
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EmbeddedChannel ch = (EmbeddedChannel) ctx.channel();
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ch.runPendingTasks();
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ch.checkException();
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checkException();
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}
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public void finishAndReleaseAll() throws Exception {
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checkException();
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Object o;
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while ((o = readInboundMessageOrUserEvent()) != null) {
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ReferenceCountUtil.release(o);
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}
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}
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public Channel channel() {
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return ctx.channel();
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}
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private static final class UserEvent {
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private final Object evt;
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UserEvent(Object evt) {
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this.evt = evt;
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}
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}
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}
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