/*
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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package sun.nio.ch;
import java.io.*;
import java.nio.ByteBuffer;
import java.nio.channels.*;
import java.nio.channels.spi.*;
class SinkChannelImpl
extends Pipe.SinkChannel
implements SelChImpl
{
// Used to make native read and write calls
private static final NativeDispatcher nd = new FileDispatcherImpl();
// The file descriptor associated with this channel
FileDescriptor fd;
// fd value needed for dev/poll. This value will remain valid
// even after the value in the file descriptor object has been set to -1
int fdVal;
// ID of native thread doing write, for signalling
private volatile long thread = 0;
// Lock held by current reading thread
private final Object lock = new Object();
// Lock held by any thread that modifies the state fields declared below
// DO NOT invoke a blocking I/O operation while holding this lock!
private final Object stateLock = new Object();
// -- The following fields are protected by stateLock
// Channel state
private static final int ST_UNINITIALIZED = -1;
private static final int ST_INUSE = 0;
private static final int ST_KILLED = 1;
private volatile int state = ST_UNINITIALIZED;
// -- End of fields protected by stateLock
public FileDescriptor getFD() {
return fd;
}
public int getFDVal() {
return fdVal;
}
SinkChannelImpl(SelectorProvider sp, FileDescriptor fd) {
super(sp);
this.fd = fd;
this.fdVal = IOUtil.fdVal(fd);
this.state = ST_INUSE;
}
protected void implCloseSelectableChannel() throws IOException {
synchronized (stateLock) {
if (state != ST_KILLED)
nd.preClose(fd);
long th = thread;
if (th != 0)
NativeThread.signal(th);
if (!isRegistered())
kill();
}
}
public void kill() throws IOException {
synchronized (stateLock) {
if (state == ST_KILLED)
return;
if (state == ST_UNINITIALIZED) {
state = ST_KILLED;
return;
}
assert !isOpen() && !isRegistered();
nd.close(fd);
state = ST_KILLED;
}
}
protected void implConfigureBlocking(boolean block) throws IOException {
IOUtil.configureBlocking(fd, block);
}
public boolean translateReadyOps(int ops, int initialOps,
SelectionKeyImpl sk) {
int intOps = sk.nioInterestOps();// Do this just once, it synchronizes
int oldOps = sk.nioReadyOps();
int newOps = initialOps;
if ((ops & PollArrayWrapper.POLLNVAL) != 0)
throw new Error("POLLNVAL detected");
if ((ops & (PollArrayWrapper.POLLERR
| PollArrayWrapper.POLLHUP)) != 0) {
newOps = intOps;
sk.nioReadyOps(newOps);
return (newOps & ~oldOps) != 0;
}
if (((ops & PollArrayWrapper.POLLOUT) != 0) &&
((intOps & SelectionKey.OP_WRITE) != 0))
newOps |= SelectionKey.OP_WRITE;
sk.nioReadyOps(newOps);
return (newOps & ~oldOps) != 0;
}
public boolean translateAndUpdateReadyOps(int ops, SelectionKeyImpl sk) {
return translateReadyOps(ops, sk.nioReadyOps(), sk);
}
public boolean translateAndSetReadyOps(int ops, SelectionKeyImpl sk) {
return translateReadyOps(ops, 0, sk);
}
public void translateAndSetInterestOps(int ops, SelectionKeyImpl sk) {
if (ops == SelectionKey.OP_WRITE)
ops = PollArrayWrapper.POLLOUT;
sk.selector.putEventOps(sk, ops);
}
private void ensureOpen() throws IOException {
if (!isOpen())
throw new ClosedChannelException();
}
public int write(ByteBuffer src) throws IOException {
ensureOpen();
synchronized (lock) {
int n = 0;
try {
begin();
if (!isOpen())
return 0;
thread = NativeThread.current();
do {
n = IOUtil.write(fd, src, -1, nd);
} while ((n == IOStatus.INTERRUPTED) && isOpen());
return IOStatus.normalize(n);
} finally {
thread = 0;
end((n > 0) || (n == IOStatus.UNAVAILABLE));
assert IOStatus.check(n);
}
}
}
public long write(ByteBuffer[] srcs) throws IOException {
if (srcs == null)
throw new NullPointerException();
ensureOpen();
synchronized (lock) {
long n = 0;
try {
begin();
if (!isOpen())
return 0;
thread = NativeThread.current();
do {
n = IOUtil.write(fd, srcs, nd);
} while ((n == IOStatus.INTERRUPTED) && isOpen());
return IOStatus.normalize(n);
} finally {
thread = 0;
end((n > 0) || (n == IOStatus.UNAVAILABLE));
assert IOStatus.check(n);
}
}
}
public long write(ByteBuffer[] srcs, int offset, int length)
throws IOException
{
if ((offset < 0) || (length < 0) || (offset > srcs.length - length))
throw new IndexOutOfBoundsException();
return write(Util.subsequence(srcs, offset, length));
}
}