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/*
* 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 javax.net;
import java.io.IOException;
import java.net.InetAddress;
import java.net.ServerSocket;
import java.net.SocketException;
/**
* This abstract class defines methods to create server sockets. It can be
* subclassed to create specific server socket types.
*/
public abstract class ServerSocketFactory {
private static ServerSocketFactory defaultFactory;
/**
* Gets the default server socket factory of the system which can be used to
* create new server sockets without creating a subclass of this factory.
*
* @return the system default server socket factory.
*/
public static synchronized ServerSocketFactory getDefault() {
if (defaultFactory == null) {
defaultFactory = new DefaultServerSocketFactory();
}
return defaultFactory;
}
/**
* Creates a new {@code ServerSocketFactory} instance.
*/
protected ServerSocketFactory() {
}
/**
* Creates a new server socket which is not bound to any local address. This
* method has to be overridden by a subclass otherwise a {@code
* SocketException} is thrown.
*
* @return the created unbound server socket.
* @throws IOException
* if an error occurs while creating a new server socket.
*/
public ServerSocket createServerSocket() throws IOException {
// follow RI's behavior
throw new SocketException("Unbound server sockets not implemented");
}
/**
* Creates a new server socket which is bound to the given port with a
* maximum backlog of 50 unaccepted connections.
*
* @param port the port on which the created socket has to listen.
* @return the created bound server socket.
* @throws IOException
* if an error occurs while creating a new server socket.
*/
public abstract ServerSocket createServerSocket(int port) throws IOException;
/**
* Creates a new server socket which is bound to the given port and
* configures its maximum of queued connections.
*
* @param port the port on which the created socket has to listen.
* @param backlog the maximum number of unaccepted connections. Passing 0 or
* a negative value yields the default backlog of 50.
* @return the created bound server socket.
* @throws IOException if an error occurs while creating a new server socket.
*/
public abstract ServerSocket createServerSocket(int port, int backlog) throws IOException;
/**
* Creates a new server socket which is bound to the given address on the
* specified port and configures its maximum of queued connections.
*
* @param port the port on which the created socket has to listen.
* @param backlog the maximum number of unaccepted connections. Passing 0 or
* a negative value yields the default backlog of 50.
* @param iAddress the address of the network interface which is used by the
* created socket.
* @return the created bound server socket.
* @throws IOException if an error occurs while creating a new server socket.
*/
public abstract ServerSocket createServerSocket(int port, int backlog, InetAddress iAddress)
throws IOException;
}
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