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Server.java
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Server.java
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/*
* MIT License
*
* Copyright (c) 2020 Jacob Glickman
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
package com.github.simplenet;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.Closeable;
import java.io.IOException;
import java.io.UncheckedIOException;
import java.net.InetSocketAddress;
import java.nio.channels.Channel;
import java.nio.channels.ServerSocketChannel;
import java.nio.channels.SocketChannel;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Objects;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import java.util.function.Consumer;
/**
* The entity that all {@link Client}s will connect to.
*
* @author Jacob G.
* @since November 1, 2017
*/
public class Server implements Closeable {
private static final Logger LOGGER = LoggerFactory.getLogger(Server.class);
/**
* The maximum value for a port that a {@link Server server} can be bound to.
*/
private static final int MAX_PORT = 65_535;
/**
* The backing {@link Channel channel} of this {@link Server server}.
*/
private ServerSocketChannel channel;
/**
* A thread-safe {@link Set} that keeps track of {@link Client clients} connected to this {@link Server server}.
*/
private final Set<Client> connectedClients;
/**
* A collection of listeners that are fired when a {@link Client client} connects to this {@link Server server}.
*/
private final Collection<Consumer<Client>> connectListeners;
/**
* Instantiates a new {@link Server}.
*/
public Server() {
this.connectedClients = ConcurrentHashMap.newKeySet();
this.connectListeners = new ArrayList<>(1);
}
/**
* Attempts to bind the {@link Server} to the specified {@code address} and {@code port}.
*
* @param address The IP address to bind to, whose value can also be {@code "localhost"}.
* @param port The port to bind to, which must be in the range: {@code 0 <= port <= 65535}.
* @throws IllegalArgumentException If {@code port} is less than 0 or greater than 65535.
* @throws IllegalStateException If this server is already running on any address/port.
* @throws IllegalStateException If the server is unable to bind to the specified address or port.
*/
public final void bind(String address, int port) {
Objects.requireNonNull(address);
if (port < 0 || port > MAX_PORT) {
throw new IllegalArgumentException("The port must be between 0 and 65535!");
}
try {
channel = ServerSocketChannel.open();
} catch (IOException e) {
throw new UncheckedIOException("An IOException occurred when attempting to open the server!", e);
}
try {
channel.configureBlocking(true);
} catch (IOException e) {
throw new UncheckedIOException("An IOException occurred when configuring the channel to block!", e);
}
try {
channel.bind(new InetSocketAddress(address, port));
} catch (IOException e) {
throw new UncheckedIOException("An IOException occurred when attempting to bind the server to the " +
"specified address and port!", e);
}
Thread.Builder builder = Thread.builder().daemon(false).virtual().name("SimpleNet-", 1);
// Use a kernel thread to accept connections, and virtual threads for everything else.
Thread.builder().daemon(false).name("SimpleNet").task(() -> {
while (true) {
try {
SocketChannel connection = channel.accept();
builder.task(() -> {
Client client = new Client(connection);
connectedClients.add(client);
client.onDisconnect(() -> connectedClients.remove(client));
connectListeners.forEach(consumer -> consumer.accept(client));
}).start();
} catch (IOException e) {
LOGGER.error("An IOException occurred when attempting to accept a client connection!", e);
break;
}
}
}).start();
}
/**
* Closes this {@link Server} by first invoking {@link Client#close()} on every connected {@link Client}, and
* then closes the backing {@link ServerSocketChannel}.
*/
@Override
public final void close() {
connectedClients.removeIf((Client client) -> {
client.close();
return true;
});
try {
channel.close();
} catch (IOException e) {
LOGGER.error("An IOException occurred when attempting to close the backing channel!", e);
}
}
/**
* Registers a listener that fires when a {@link Client client} connects to this {@link Server server}.
* <br><br>
* When invoking this method more than once, multiple listeners will be registered.
*
* @param listener A {@link Consumer} that will be accepted when a {@link Client client} disconnects from this
* {@link Server server}.
*/
public final void onConnect(Consumer<Client> listener) {
connectListeners.add(listener);
}
/**
* @return Gets an unmodifiable {@link Set} of {@link Client clients} connected to this {@link Server}.
*/
public final Set<Client> getConnectedClients() {
return Set.copyOf(connectedClients);
}
}