| /* |
| * 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.tuweni.net.coroutines |
| |
| import java.io.IOException |
| import java.net.SocketAddress |
| import java.nio.ByteBuffer |
| import java.nio.channels.AsynchronousCloseException |
| import java.nio.channels.ClosedByInterruptException |
| import java.nio.channels.ClosedChannelException |
| import java.nio.channels.DatagramChannel |
| import java.nio.channels.SelectionKey |
| |
| /** |
| * A co-routine based datagram-oriented network channel. |
| * |
| */ |
| class CoroutineDatagramChannel private constructor( |
| private val channel: DatagramChannel, |
| private val group: CoroutineChannelGroup |
| ) : CoroutineByteChannel, |
| ScatteringCoroutineByteChannel by ScatteringCoroutineByteChannelMixin(channel, group), |
| GatheringCoroutineByteChannel by GatheringCoroutineByteChannelMixin(channel, group), |
| CoroutineNetworkChannel by CoroutineNetworkChannelMixin(channel) { |
| |
| companion object { |
| /** |
| * Opens a datagram channel. |
| * |
| * @param selector The selector to use with this channel (defaults to `CommonCoroutineSelector`). |
| * @return A new channel. |
| * @throws IOException If an I/O error occurs. |
| */ |
| fun open(group: CoroutineChannelGroup = CommonCoroutineGroup): CoroutineDatagramChannel { |
| val channel = DatagramChannel.open() |
| channel.configureBlocking(false) |
| return CoroutineDatagramChannel(channel, group) |
| } |
| } |
| |
| init { |
| group.register(this) |
| } |
| |
| override fun close() { |
| group.deRegister(this) |
| channel.close() |
| } |
| |
| /** |
| * Indicates whether this channel is connected. |
| */ |
| val isConnected: Boolean |
| get() = channel.isConnected |
| |
| /** |
| * Get the remote address to which this channel is connected. |
| */ |
| val remoteAddress: SocketAddress |
| get() = channel.remoteAddress |
| |
| override fun bind(local: SocketAddress?): CoroutineDatagramChannel { |
| channel.bind(local) |
| return this |
| } |
| |
| /** |
| * Connect this channel. |
| * |
| * The channel will be configured so that it only receives datagrams from, and sends datagrams to, the given |
| * remote peer address. Once connected, datagrams may not be received from or sent to any other address. A datagram |
| * channel remains connected until it is disconnected or closed. |
| * |
| * @param remote The remote address to which this channel is to be connected. |
| * @return This channel. |
| * @throws ClosedChannelException If the channel is closed. |
| * @throws AsynchronousCloseException If another thread closes this channel while the connect operation is in |
| * progress. |
| * @throws ClosedByInterruptException If another thread interrupts the current thread while the connect operation is |
| * in progress, thereby closing the channel and setting the current thread's interrupt status. |
| * @throws IOException If some other I/O error occurs. |
| */ |
| fun connect(remote: SocketAddress): CoroutineDatagramChannel { |
| channel.connect(remote) |
| return this |
| } |
| |
| /** |
| * Disconnects this channel. |
| */ |
| fun disconnect(): CoroutineDatagramChannel { |
| channel.disconnect() |
| return this |
| } |
| |
| /** |
| * Receives a datagram via this channel. |
| * |
| * @param dst The buffer into which the datagram is to be transferred. |
| * @return The datagram's source address. |
| * @throws ClosedChannelException If the channel is closed. |
| * @throws AsynchronousCloseException If another thread closes this channel while the receive operation is in |
| * progress. |
| * @throws ClosedByInterruptException If another thread interrupts the current thread while the receive operation is |
| * in progress, thereby closing the channel and setting the current thread's interrupt status. |
| * @throws IOException If some other I/O error occurs. |
| */ |
| suspend fun receive(dst: ByteBuffer): SocketAddress { |
| while (true) { |
| val address = channel.receive(dst) |
| if (address != null) { |
| return address |
| } |
| // slow path |
| group.select(channel, SelectionKey.OP_READ) |
| } |
| } |
| |
| /** |
| * Receives a datagram via this channel, if one is immediately available. |
| * |
| * @param dst The buffer into which the datagram is to be transferred. |
| * @return The datagram's source address, or `null` if no datagram was available to be received. |
| * @throws ClosedChannelException If the channel is closed. |
| * @throws AsynchronousCloseException If another thread closes this channel while the receive operation is in |
| * progress. |
| * @throws ClosedByInterruptException If another thread interrupts the current thread while the receive operation is |
| * in progress, thereby closing the channel and setting the current thread's interrupt status. |
| * @throws IOException If some other I/O error occurs. |
| */ |
| fun tryReceive(dst: ByteBuffer): SocketAddress? = channel.receive(dst) |
| |
| /** |
| * Sends a datagram via this channel. |
| * |
| * @param src The buffer containing the datagram to be sent. |
| * @param target The address to which the datagram is to be sent. |
| * @return The number of bytes sent. |
| * @throws ClosedChannelException If the channel is closed. |
| * @throws AsynchronousCloseException If another thread closes this channel while the send operation is in progress. |
| * @throws ClosedByInterruptException If another thread interrupts the current thread while the send operation is |
| * in progress, thereby closing the channel and setting the current thread's interrupt status. |
| * @throws IOException If some other I/O error occurs. |
| */ |
| suspend fun send(src: ByteBuffer, target: SocketAddress): Int { |
| while (true) { |
| val n = channel.send(src, target) |
| if (n != 0 || src.remaining() == 0) { |
| return n |
| } |
| // slow path |
| group.select(channel, SelectionKey.OP_WRITE) |
| } |
| } |
| |
| /** |
| * Sends a datagram via this channel, if it can be sent immediately. |
| * |
| * @param src The buffer containing the datagram to be sent. |
| * @param target The address to which the datagram is to be sent. |
| * @return The number of bytes sent, which will be zero if the channel was not ready to send. |
| * @throws ClosedChannelException If the channel is closed. |
| * @throws AsynchronousCloseException If another thread closes this channel while the send operation is in progress. |
| * @throws ClosedByInterruptException If another thread interrupts the current thread while the send operation is |
| * in progress, thereby closing the channel and setting the current thread's interrupt status. |
| * @throws IOException If some other I/O error occurs. |
| */ |
| fun trySend(src: ByteBuffer, target: SocketAddress): Int = channel.send(src, target) |
| } |