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// Copyright 2014 The Bazel Authors. All rights reserved.
//
// 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.google.devtools.build.lib.unix;
import java.io.FileDescriptor;
import java.io.IOException;
import java.io.InterruptedIOException;
import java.net.Socket;
import java.net.SocketException;
import java.net.SocketTimeoutException;
/**
* <p>An implementation of ServerSocket for local (AF_UNIX) sockets.
*
* <p>This class intentionally doesn't extend java.net.ServerSocket although it
* has some similarity to it. The java.net class hierarchy is a terrible mess
* and is inextricably coupled to the Internet Protocol.
*
* <p>This code is not intended to be portable to non-UNIX platforms.
*/
public class LocalServerSocket extends LocalSocket {
// Socket timeout in milliseconds. No timeout by default.
private long soTimeoutMillis = 0;
/**
* Constructs an unbound local server socket.
*/
public LocalServerSocket() throws IOException {
super();
}
/**
* Constructs a server socket, binds it to the specified address, and
* listens for incoming connections with the specified backlog.
*
* @throws IOException if any of the socket/bind/listen operations failed.
*/
public LocalServerSocket(LocalSocketAddress address, int backlog)
throws IOException {
this();
bind(address);
listen(backlog);
}
/**
* Constructs a server socket, binds it to the specified address, and begin
* listening for incoming connections using the default backlog.
*
* @throws IOException if any of the socket/bind/listen operations failed.
*/
public LocalServerSocket(LocalSocketAddress address) throws IOException {
this(address, 50);
}
/**
* Specifies the timeout in milliseconds for accept(). Setting it to
* zero means an indefinite timeout.
*/
public void setSoTimeout(long timeoutMillis) {
soTimeoutMillis = timeoutMillis;
}
/**
* Returns the current timeout in milliseconds.
*/
public long getSoTimeout() {
return soTimeoutMillis;
}
/**
* Binds the specified address to this socket. The socket must be unbound.
* This causes the filesystem entry to appear.
*
* @throws IOException if the bind failed.
*/
public synchronized void bind(LocalSocketAddress address)
throws IOException {
if (address == null) {
throw new NullPointerException("address");
}
checkNotClosed();
if (state != State.NEW) {
throw new SocketException("socket is already bound to an address");
}
bind(fd, address.getName().toString()); // JNI
this.address = address;
this.state = State.BOUND;
}
/**
* Listen for incoming connections on a socket using the specfied backlog.
* The socket must be bound but not already listening.
*
* @throws IOException if the listen failed.
*/
public synchronized void listen(int backlog) throws IOException {
if (backlog < 1) {
throw new IllegalArgumentException("backlog=" + backlog);
}
checkNotClosed();
if (address == null) {
throw new SocketException("socket has no address bound");
}
if (state == State.LISTENING) {
throw new SocketException("socket is already listening");
}
listen(fd, backlog); // JNI
this.state = State.LISTENING;
}
/**
* Blocks until a connection is made to this socket and accepts it, returning
* a new socket connected to the client.
*
* @return the new socket connected to the client.
* @throws IOException if an error occurs when waiting for a connection.
* @throws SocketTimeoutException if a timeout was previously set with
* setSoTimeout and the timeout has been reached.
* @throws InterruptedIOException if the thread is interrupted when the
* method is blocked.
*/
public synchronized Socket accept()
throws IOException, SocketTimeoutException, InterruptedIOException {
if (state != State.LISTENING) {
throw new SocketException("socket is not in listening state");
}
// Throws a SocketTimeoutException if timeout.
if (soTimeoutMillis != 0) {
poll(fd, soTimeoutMillis); // JNI
}
FileDescriptor clientFd = new FileDescriptor();
accept(fd, clientFd); // JNI
final LocalSocketImpl impl = new LocalSocketImpl(clientFd);
return new Socket(impl) {
@Override
public boolean isConnected() {
return true;
}
@Override
public synchronized void close() throws IOException {
if (isClosed()) {
return;
} else {
super.close();
// Workaround for the fact that super.created==false because we
// created the impl ourselves. As a result, super.close() doesn't
// call impl.close(). *Sigh*, java.net is horrendous.
// (Perhaps we should dispense with Socket/SocketImpl altogether?)
impl.close();
}
}
};
}
@Override
public String toString() {
return "LocalServerSocket(" + address + ")";
}
}
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