| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF 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 org.apache.nifi.event.transport.netty; |
| |
| import io.netty.channel.Channel; |
| import io.netty.channel.ChannelFuture; |
| import io.netty.channel.EventLoopGroup; |
| import io.netty.channel.pool.ChannelPool; |
| import io.netty.util.concurrent.Future; |
| import org.apache.nifi.event.transport.EventException; |
| import org.apache.nifi.event.transport.EventSender; |
| import org.apache.nifi.event.transport.configuration.ShutdownQuietPeriod; |
| import org.apache.nifi.event.transport.configuration.ShutdownTimeout; |
| |
| import java.net.SocketAddress; |
| import java.time.Duration; |
| import java.util.concurrent.TimeUnit; |
| |
| /** |
| * Netty Event Sender with Channel Pool |
| * |
| * @param <T> Event Type |
| */ |
| class NettyEventSender<T> implements EventSender<T> { |
| private final EventLoopGroup group; |
| |
| private final ChannelPool channelPool; |
| |
| private final SocketAddress remoteAddress; |
| |
| private final boolean singleEventPerConnection; |
| |
| private final Duration shutdownQuietPeriod; |
| |
| private final Duration shutdownTimeout; |
| |
| /** |
| * Netty Channel Event Sender with Event Loop Group and Channel Pool |
| * |
| * @param group Event Loop Group |
| * @param channelPool Channel Pool |
| * @param remoteAddress Remote Address |
| * @param singleEventPerConnection If true, send a single event per connection, and then close it. |
| */ |
| NettyEventSender(final EventLoopGroup group, final ChannelPool channelPool, final SocketAddress remoteAddress, final boolean singleEventPerConnection) { |
| this(group, channelPool, remoteAddress, singleEventPerConnection, ShutdownQuietPeriod.DEFAULT.getDuration(), ShutdownTimeout.DEFAULT.getDuration()); |
| } |
| |
| /** |
| * Netty Channel Event Sender with Event Loop Group, Channel Pool, and Shutdown Configuration |
| * |
| * @param group Event Loop Group |
| * @param channelPool Channel Pool |
| * @param remoteAddress Remote Address |
| * @param singleEventPerConnection If true, send a single event per connection, and then close it. |
| * @param shutdownQuietPeriod server shutdown quiet period |
| * @param shutdownTimeout server shutdown timeout |
| */ |
| NettyEventSender(final EventLoopGroup group, final ChannelPool channelPool, final SocketAddress remoteAddress, final boolean singleEventPerConnection, |
| final Duration shutdownQuietPeriod, final Duration shutdownTimeout) { |
| this.group = group; |
| this.channelPool = channelPool; |
| this.remoteAddress = remoteAddress; |
| this.singleEventPerConnection = singleEventPerConnection; |
| this.shutdownQuietPeriod = shutdownQuietPeriod; |
| this.shutdownTimeout = shutdownTimeout; |
| } |
| |
| /** |
| * Send Event using Channel acquired from Channel Pool |
| * |
| * @param event Event |
| */ |
| @Override |
| public void sendEvent(final T event) { |
| try { |
| final Future<Channel> futureChannel = channelPool.acquire().sync(); |
| final Channel channel = futureChannel.get(); |
| try { |
| final ChannelFuture channelFuture = channel.writeAndFlush(event); |
| channelFuture.syncUninterruptibly(); |
| } finally { |
| releaseChannel(channel); |
| } |
| } catch (final Exception e) { |
| throw new EventException(getChannelMessage("Send Failed"), e); |
| } |
| } |
| |
| /** |
| * Close Channel Pool and Event Loop Group |
| */ |
| @Override |
| public void close() { |
| try { |
| channelPool.close(); |
| } finally { |
| group.shutdownGracefully(shutdownQuietPeriod.toMillis(), shutdownTimeout.toMillis(), TimeUnit.MILLISECONDS).syncUninterruptibly(); |
| } |
| } |
| |
| /** |
| * String representation includes Channel Remote Address |
| * |
| * @return String with Channel Remote Address |
| */ |
| @Override |
| public String toString() { |
| return getChannelMessage("Event Sender"); |
| } |
| |
| private String getChannelMessage(final String message) { |
| return String.format("%s Remote Address [%s]", message, remoteAddress); |
| } |
| |
| private void releaseChannel(final Channel channel) { |
| if (singleEventPerConnection) { |
| channel.close(); |
| } |
| channelPool.release(channel); |
| } |
| } |