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QuestDB is High Performance Time Series Database
/*******************************************************************************
* ___ _ ____ ____
* / _ \ _ _ ___ ___| |_| _ \| __ )
* | | | | | | |/ _ \/ __| __| | | | _ \
* | |_| | |_| | __/\__ \ |_| |_| | |_) |
* \__\_\\__,_|\___||___/\__|____/|____/
*
* Copyright (C) 2014-2016 Appsicle
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* This program 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see ioQueue;
private final Sequence ioSequence;
private final RingQueue interestQueue;
private final MPSequence interestPubSequence;
private final SCSequence interestSubSequence = new SCSequence();
private final Clock clock;
private final ServerConfiguration configuration;
private final int timeout;
private final LongMatrix pending = new LongMatrix<>(4);
private final int maxConnections;
private final LongIntHashMap fds = new LongIntHashMap();
private int connectionCount = 0;
public Win32SelectDispatcher(
CharSequence ip,
int port,
RingQueue ioQueue,
Sequence ioSequence,
Clock clock,
ServerConfiguration configuration,
int capacity
) {
this.readFdSet = new FDSet(capacity);
this.writeFdSet = new FDSet(capacity);
this.ioQueue = ioQueue;
this.ioSequence = ioSequence;
this.interestQueue = new RingQueue<>(IOEvent.FACTORY, ioQueue.getCapacity());
this.interestPubSequence = new MPSequence(interestQueue.getCapacity());
this.interestPubSequence.then(this.interestSubSequence).then(this.interestPubSequence);
this.clock = clock;
this.configuration = configuration;
this.maxConnections = configuration.getHttpMaxConnections();
this.timeout = configuration.getHttpTimeout();
// bind socket
this.socketFd = Net.socketTcp(false);
if (Net.bind(this.socketFd, ip, port)) {
Net.listen(this.socketFd, 128);
int r = pending.addRow();
pending.set(r, M_TIMESTAMP, System.currentTimeMillis());
pending.set(r, M_FD, socketFd);
pending.set(r, M_OPERATION, ChannelStatus.READ);
readFdSet.add(socketFd);
readFdSet.setCount(1);
writeFdSet.setCount(0);
} else {
throw new NetworkError("Failed to bind socket. System error " + Os.errno());
}
}
@Override
public void close() throws IOException {
readFdSet.close();
writeFdSet.close();
for (int i = 0, n = pending.size(); i < n; i++) {
Files.close(pending.get(i, M_FD));
Misc.free(pending.get(i));
}
pending.zapTop(pending.size());
}
@Override
public int getConnectionCount() {
return connectionCount;
}
@Override
public void registerChannel(IOContext context, int channelStatus) {
long cursor = interestPubSequence.nextBully();
IOEvent evt = interestQueue.get(cursor);
evt.context = context;
evt.channelStatus = channelStatus;
LOG.debug().$("Re-queuing ").$(channelStatus).$(" on ").$(context.channel.getFd()).$();
interestPubSequence.done(cursor);
}
private static native int select(long readfds, long writefds, long exceptfds);
private static native int countOffset();
private static native int arrayOffset();
private void accept(long timestamp) {
while (true) {
long _fd = Net.accept(socketFd);
if (_fd < 0) {
int err = Os.errno();
if (err != Net.EWOULDBLOCK && err != 0) {
LOG.error().$("Error in accept(): ").$(err).$();
}
break;
}
LOG.info().$(" Connected ").$(_fd).$();
if (Net.configureNonBlocking(_fd) < 0) {
LOG.error().$("Cannot make FD non-blocking").$();
Files.close(_fd);
continue;
}
connectionCount++;
if (connectionCount > maxConnections) {
LOG.info().$("Too many connections, kicking out ").$(_fd).$();
Files.close(_fd);
connectionCount--;
return;
}
addPending(_fd, timestamp);
}
}
private void addPending(long _fd, long timestamp) {
int r = pending.addRow();
LOG.debug().$(" Matrix row ").$(r).$(" for ").$(_fd).$();
pending.set(r, M_TIMESTAMP, timestamp);
pending.set(r, M_FD, _fd);
pending.set(r, M_OPERATION, ChannelStatus.READ);
NetworkChannelImpl channel = new NetworkChannelImpl(_fd);
pending.set(r, new IOContext(channel, configuration, clock));
}
private void disconnect(IOContext context, int disconnectReason) {
LOG.info().$("Disconnected ").$(context.channel.getFd()).$(": ").$(DisconnectReason.nameOf(disconnectReason)).$();
context.close();
connectionCount--;
}
private void enqueue(IOContext context, int channelStatus) {
long cursor = ioSequence.nextBully();
IOEvent evt = ioQueue.get(cursor);
evt.context = context;
evt.channelStatus = channelStatus;
ioSequence.done(cursor);
LOG.debug().$("Queuing ").$(channelStatus).$(" on ").$(context.channel.getFd()).$();
}
private boolean processRegistrations(long timestamp) {
long cursor;
boolean useful = false;
while ((cursor = interestSubSequence.next()) > -1) {
useful = true;
IOEvent evt = interestQueue.get(cursor);
IOContext context = evt.context;
int channelStatus = evt.channelStatus;
interestSubSequence.done(cursor);
int r = pending.addRow();
pending.set(r, M_TIMESTAMP, timestamp);
pending.set(r, M_FD, context.channel.getFd());
pending.set(r, M_OPERATION, channelStatus);
pending.set(r, context);
}
return useful;
}
private void queryFdSets(long timestamp) {
for (int i = 0, n = readFdSet.getCount(); i < n; i++) {
long fd = readFdSet.get(i);
if (fd == socketFd) {
accept(timestamp);
} else {
fds.put(fd, FD_READ);
}
}
// collect writes into hash map
for (int i = 0, n = writeFdSet.getCount(); i < n; i++) {
long fd = writeFdSet.get(i);
int op = fds.get(fd);
if (op == -1) {
fds.put(fd, FD_WRITE);
} else {
fds.put(fd, FD_READ | FD_WRITE);
}
}
}
@Override
protected boolean runSerially() {
int count = select(readFdSet.address, writeFdSet.address, 0);
if (count < 0) {
LOG.error().$("Error in select(): ").$(Os.errno()).$();
return false;
}
final long timestamp = System.currentTimeMillis();
boolean useful = false;
fds.clear();
// collect reads into hash map
if (count > 0) {
queryFdSets(timestamp);
useful = true;
}
// process returned fds
useful = processRegistrations(timestamp) | useful;
// re-arm select() fds
int readFdCount = 0;
int writeFdCount = 0;
readFdSet.reset();
writeFdSet.reset();
long deadline = timestamp - timeout;
for (int i = 0, n = pending.size(); i < n; ) {
long ts = pending.get(i, M_TIMESTAMP);
long fd = pending.get(i, M_FD);
int _new_op = fds.get(fd);
if (_new_op == -1) {
// check if expired
if (ts < deadline && fd != socketFd) {
disconnect(pending.get(i), DisconnectReason.IDLE);
pending.deleteRow(i);
n--;
useful = true;
continue;
}
// not fired, simply re-arm
switch ((int) pending.get(i, M_OPERATION)) {
case ChannelStatus.READ:
readFdSet.add(fd);
readFdCount++;
i++;
break;
case ChannelStatus.WRITE:
writeFdSet.add(fd);
writeFdCount++;
i++;
break;
case ChannelStatus.DISCONNECTED:
disconnect(pending.get(i), DisconnectReason.SILLY);
pending.deleteRow(i);
n--;
useful = true;
break;
case ChannelStatus.EOF:
disconnect(pending.get(i), DisconnectReason.PEER);
pending.deleteRow(i);
n--;
useful = true;
break;
default:
break;
}
} else {
// this fd just has fired
// publish event
// and remove from pending
final IOContext context = pending.get(i);
if ((_new_op & FD_READ) > 0) {
enqueue(context, ChannelStatus.READ);
}
if ((_new_op & FD_WRITE) > 0) {
enqueue(context, ChannelStatus.WRITE);
}
pending.deleteRow(i);
n--;
}
}
readFdSet.setCount(readFdCount);
writeFdSet.setCount(writeFdCount);
return useful;
}
private static class FDSet {
private long address;
private int size;
private long _wptr;
private long lim;
private FDSet(int size) {
int l = ARRAY_OFFSET + 8 * size;
this.address = Unsafe.malloc(l);
this.size = size;
this._wptr = address + ARRAY_OFFSET;
this.lim = address + l;
}
private void add(long fd) {
if (_wptr == lim) {
resize();
}
long p = _wptr;
Unsafe.getUnsafe().putLong(p, fd);
_wptr = p + 8;
}
private void close() {
if (address != 0) {
Unsafe.free(address, lim - address);
address = 0;
}
}
private long get(int index) {
return Unsafe.getUnsafe().getLong(address + ARRAY_OFFSET + index * 8L);
}
private int getCount() {
return Unsafe.getUnsafe().getInt(address + COUNT_OFFSET);
}
private void setCount(int count) {
Unsafe.getUnsafe().putInt(address + COUNT_OFFSET, count);
}
private void reset() {
_wptr = address + ARRAY_OFFSET;
}
private void resize() {
int sz = size * 2;
int l = ARRAY_OFFSET + 8 * sz;
long _addr = Unsafe.malloc(l);
Unsafe.getUnsafe().copyMemory(address, _addr, lim - address);
Unsafe.free(address, lim - address);
lim = _addr + l;
size = sz;
_wptr = _addr + (_wptr - address);
address = _addr;
}
}
static {
Os.init();
ARRAY_OFFSET = arrayOffset();
COUNT_OFFSET = countOffset();
}
}