Java tutorial
/* * Copyright 2015 MongoDB, Inc. * Copyright 2012 The Netty Project * * Licensed 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 com.mongodb.connection.netty; import io.netty.channel.ChannelHandlerContext; import io.netty.channel.ChannelInboundHandlerAdapter; import io.netty.handler.timeout.ReadTimeoutException; import java.util.concurrent.ScheduledFuture; import java.util.concurrent.TimeUnit; import static com.mongodb.assertions.Assertions.isTrue; import static com.mongodb.assertions.Assertions.isTrueArgument; /** * Passes a {@link ReadTimeoutException} if the time between a {@link #scheduleTimeout} and {@link #removeTimeout} is longer than the set * timeout. */ final class ReadTimeoutHandler extends ChannelInboundHandlerAdapter { private final long readTimeout; private volatile ScheduledFuture<?> timeout; public ReadTimeoutHandler(final long readTimeout) { isTrueArgument("readTimeout must be greater than zero.", readTimeout > 0); this.readTimeout = readTimeout; } void scheduleTimeout(final ChannelHandlerContext ctx) { isTrue("Handler called from the eventLoop", ctx.channel().eventLoop().inEventLoop()); if (timeout == null) { timeout = ctx.executor().schedule(new ReadTimeoutTask(ctx), readTimeout, TimeUnit.MILLISECONDS); } } void removeTimeout(final ChannelHandlerContext ctx) { isTrue("Handler called from the eventLoop", ctx.channel().eventLoop().inEventLoop()); if (timeout != null) { timeout.cancel(false); timeout = null; } } private static final class ReadTimeoutTask implements Runnable { private final ChannelHandlerContext ctx; ReadTimeoutTask(final ChannelHandlerContext ctx) { this.ctx = ctx; } @Override public void run() { if (ctx.channel().isOpen()) { try { ctx.fireExceptionCaught(ReadTimeoutException.INSTANCE); ctx.close(); } catch (Throwable t) { ctx.fireExceptionCaught(t); } } } } }