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Pure Java implementation of libzmq
/*
Copyright (c) 2007-2012 iMatix Corporation
Copyright (c) 2009-2011 250bpm s.r.o.
Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
This file is part of 0MQ.
0MQ is free software; you can redistribute it and/or modify it under
the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
0MQ 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 Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program. If not, see saved = new HashMap ();
for (SelectionKey key: selector.keys ()) {
if (key.isValid ())
saved.put(key.channel (), key);
}
for (int i = 0; i < count; i++) {
PollItem item = items_[i];
if (item == null)
continue;
SelectableChannel ch = item.getChannel (); // mailbox channel if ZMQ socket
SelectionKey key = saved.remove (ch);
if (key != null) {
if (key.interestOps() != item.interestOps()) {
key.interestOps(item.interestOps());
}
key.attach (item);
} else {
try {
ch.register(selector, item.interestOps(), item);
} catch (ClosedChannelException e) {
throw new ZError.IOException(e);
}
}
}
if (!saved.isEmpty ()) {
for (SelectionKey deprecated: saved.values ()) {
deprecated.cancel ();
}
}
boolean first_pass = true;
int nevents = 0;
int ready;
while (true) {
// Compute the timeout for the subsequent poll.
long timeout;
if (first_pass)
timeout = 0;
else if (timeout_ < 0)
timeout = -1;
else
timeout = end - now;
// Wait for events.
try {
int rc = 0;
if (timeout < 0)
rc = selector.select (0);
else if (timeout == 0)
rc = selector.selectNow ();
else
rc = selector.select (timeout);
for (SelectionKey key: selector.keys()) {
PollItem item = (PollItem) key.attachment ();
ready = item.readyOps (key, rc);
if (ready < 0)
return -1;
if (ready > 0) {
nevents++;
}
}
selector.selectedKeys ().clear ();
} catch (IOException e) {
throw new ZError.IOException (e);
}
// If timeout is zero, exit immediately whether there are events or not.
if (timeout_ == 0)
break;
if (nevents > 0)
break;
// At this point we are meant to wait for events but there are none.
// If timeout is infinite we can just loop until we get some events.
if (timeout_ < 0) {
if (first_pass)
first_pass = false;
continue;
}
// The timeout is finite and there are no events. In the first pass
// we get a timestamp of when the polling have begun. (We assume that
// first pass have taken negligible time). We also compute the time
// when the polling should time out.
if (first_pass) {
now = Clock.now_ms ();
end = now + timeout_;
if (now == end)
break;
first_pass = false;
continue;
}
// Find out whether timeout have expired.
now = Clock.now_ms ();
if (now >= end)
break;
}
return nevents;
}
public static long zmq_stopwatch_start() {
return System.nanoTime();
}
public static long zmq_stopwatch_stop(long watch) {
return (System.nanoTime() - watch) / 1000;
}
public static int ZMQ_MAKE_VERSION(int major, int minor, int patch) {
return ((major) * 10000 + (minor) * 100 + (patch));
}
public static String zmq_strerror(int errno) {
return "Errno = " + errno;
}
private static final ThreadLocal POLL_SELECTOR = new ThreadLocal ();
// GC closes selector handle
private static class PollSelector {
private Selector selector;
private PollSelector (Selector selector) {
this.selector = selector;
}
public static Selector open () throws IOException
{
PollSelector polls = POLL_SELECTOR.get();
if (polls == null) {
synchronized (POLL_SELECTOR) {
polls = POLL_SELECTOR.get();
try {
if (polls == null) {
polls = new PollSelector (Selector.open ());
POLL_SELECTOR.set (polls);
}
} catch (IOException e) {
throw new ZError.IOException(e);
}
}
}
return polls.get();
}
public Selector get ()
{
assert (selector != null);
assert (selector.isOpen ());
return selector;
}
@Override
public void finalize ()
{
try {
selector.close ();
} catch (IOException e) {
}
try {
super.finalize ();
} catch (Throwable e) {
}
}
}
}
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