Examples with SelectionKey java.nio.channels.SelectionKey used on opensource projects

Example 6 with SelectionKey

use of java.nio.channels.SelectionKey in project tomcat by apache.

the class NioBlockingSelector method write.

/**
     * Performs a blocking write using the bytebuffer for data to be written
     * If the <code>selector</code> parameter is null, then it will perform a busy write that could
     * take up a lot of CPU cycles.
     * @param buf ByteBuffer - the buffer containing the data, we will write as long as <code>(buf.hasRemaining()==true)</code>
     * @param socket SocketChannel - the socket to write data to
     * @param writeTimeout long - the timeout for this write operation in milliseconds, -1 means no timeout
     * @return int - returns the number of bytes written
     * @throws EOFException if write returns -1
     * @throws SocketTimeoutException if the write times out
     * @throws IOException if an IO Exception occurs in the underlying socket logic
     */
public int write(ByteBuffer buf, NioChannel socket, long writeTimeout) throws IOException {
    SelectionKey key = socket.getIOChannel().keyFor(socket.getPoller().getSelector());
    if (key == null)
        throw new IOException("Key no longer registered");
    KeyReference reference = keyReferenceStack.pop();
    if (reference == null) {
        reference = new KeyReference();
    }
    NioSocketWrapper att = (NioSocketWrapper) key.attachment();
    int written = 0;
    boolean timedout = false;
    //assume we can write
    int keycount = 1;
    //start the timeout timer
    long time = System.currentTimeMillis();
    try {
        while ((!timedout) && buf.hasRemaining()) {
            if (keycount > 0) {
                //only write if we were registered for a write
                //write the data
                int cnt = socket.write(buf);
                if (cnt == -1)
                    throw new EOFException();
                written += cnt;
                if (cnt > 0) {
                    //reset our timeout timer
                    time = System.currentTimeMillis();
                    //we successfully wrote, try again without a selector
                    continue;
                }
            }
            try {
                if (att.getWriteLatch() == null || att.getWriteLatch().getCount() == 0)
                    att.startWriteLatch(1);
                poller.add(att, SelectionKey.OP_WRITE, reference);
                if (writeTimeout < 0) {
                    att.awaitWriteLatch(Long.MAX_VALUE, TimeUnit.MILLISECONDS);
                } else {
                    att.awaitWriteLatch(writeTimeout, TimeUnit.MILLISECONDS);
                }
            } catch (InterruptedException ignore) {
            // Ignore
            }
            if (att.getWriteLatch() != null && att.getWriteLatch().getCount() > 0) {
                //we got interrupted, but we haven't received notification from the poller.
                keycount = 0;
            } else {
                //latch countdown has happened
                keycount = 1;
                att.resetWriteLatch();
            }
            if (writeTimeout > 0 && (keycount == 0))
                timedout = (System.currentTimeMillis() - time) >= writeTimeout;
        }
        //while
        if (timedout)
            throw new SocketTimeoutException();
    } finally {
        poller.remove(att, SelectionKey.OP_WRITE);
        if (timedout && reference.key != null) {
            poller.cancelKey(reference.key);
        }
        reference.key = null;
        keyReferenceStack.push(reference);
    }
    return written;
}

Example 7 with SelectionKey

use of java.nio.channels.SelectionKey in project tomcat by apache.

the class NioBlockingSelector method read.

/**
     * Performs a blocking read using the bytebuffer for data to be read
     * If the <code>selector</code> parameter is null, then it will perform a busy read that could
     * take up a lot of CPU cycles.
     * @param buf ByteBuffer - the buffer containing the data, we will read as until we have read at least one byte or we timed out
     * @param socket SocketChannel - the socket to write data to
     * @param readTimeout long - the timeout for this read operation in milliseconds, -1 means no timeout
     * @return int - returns the number of bytes read
     * @throws EOFException if read returns -1
     * @throws SocketTimeoutException if the read times out
     * @throws IOException if an IO Exception occurs in the underlying socket logic
     */
public int read(ByteBuffer buf, NioChannel socket, long readTimeout) throws IOException {
    SelectionKey key = socket.getIOChannel().keyFor(socket.getPoller().getSelector());
    if (key == null)
        throw new IOException("Key no longer registered");
    KeyReference reference = keyReferenceStack.pop();
    if (reference == null) {
        reference = new KeyReference();
    }
    NioSocketWrapper att = (NioSocketWrapper) key.attachment();
    int read = 0;
    boolean timedout = false;
    //assume we can read
    int keycount = 1;
    //start the timeout timer
    long time = System.currentTimeMillis();
    try {
        while (!timedout) {
            if (keycount > 0) {
                //only read if we were registered for a read
                read = socket.read(buf);
                if (read != 0) {
                    break;
                }
            }
            try {
                if (att.getReadLatch() == null || att.getReadLatch().getCount() == 0)
                    att.startReadLatch(1);
                poller.add(att, SelectionKey.OP_READ, reference);
                if (readTimeout < 0) {
                    att.awaitReadLatch(Long.MAX_VALUE, TimeUnit.MILLISECONDS);
                } else {
                    att.awaitReadLatch(readTimeout, TimeUnit.MILLISECONDS);
                }
            } catch (InterruptedException ignore) {
            // Ignore
            }
            if (att.getReadLatch() != null && att.getReadLatch().getCount() > 0) {
                //we got interrupted, but we haven't received notification from the poller.
                keycount = 0;
            } else {
                //latch countdown has happened
                keycount = 1;
                att.resetReadLatch();
            }
            if (readTimeout >= 0 && (keycount == 0))
                timedout = (System.currentTimeMillis() - time) >= readTimeout;
        }
        //while
        if (timedout)
            throw new SocketTimeoutException();
    } finally {
        poller.remove(att, SelectionKey.OP_READ);
        if (timedout && reference.key != null) {
            poller.cancelKey(reference.key);
        }
        reference.key = null;
        keyReferenceStack.push(reference);
    }
    return read;
}

Example 8 with SelectionKey

use of java.nio.channels.SelectionKey in project tomcat by apache.

the class NioSelectorPool method read.

/**
     * Performs a read using the bytebuffer for data to be read and a selector to register for events should
     * you have the block=true.
     * If the <code>selector</code> parameter is null, then it will perform a busy read that could
     * take up a lot of CPU cycles.
     * @param buf ByteBuffer - the buffer containing the data, we will read as until we have read at least one byte or we timed out
     * @param socket SocketChannel - the socket to write data to
     * @param selector Selector - the selector to use for blocking, if null then a busy read will be initiated
     * @param readTimeout long - the timeout for this read operation in milliseconds, -1 means no timeout
     * @param block - true if you want to block until data becomes available or timeout time has been reached
     * @return int - returns the number of bytes read
     * @throws EOFException if read returns -1
     * @throws SocketTimeoutException if the read times out
     * @throws IOException if an IO Exception occurs in the underlying socket logic
     */
public int read(ByteBuffer buf, NioChannel socket, Selector selector, long readTimeout, boolean block) throws IOException {
    if (SHARED && block) {
        return blockingSelector.read(buf, socket, readTimeout);
    }
    SelectionKey key = null;
    int read = 0;
    boolean timedout = false;
    //assume we can write
    int keycount = 1;
    //start the timeout timer
    long time = System.currentTimeMillis();
    try {
        while ((!timedout)) {
            int cnt = 0;
            if (keycount > 0) {
                //only read if we were registered for a read
                cnt = socket.read(buf);
                if (cnt == -1) {
                    if (read == 0) {
                        read = -1;
                    }
                    break;
                }
                read += cnt;
                //read some more
                if (cnt > 0)
                    continue;
                //we are done reading
                if (cnt == 0 && (read > 0 || (!block)))
                    break;
            }
            if (selector != null) {
                //register OP_WRITE to the selector
                if (key == null)
                    key = socket.getIOChannel().register(selector, SelectionKey.OP_READ);
                else
                    key.interestOps(SelectionKey.OP_READ);
                if (readTimeout == 0) {
                    timedout = (read == 0);
                } else if (readTimeout < 0) {
                    keycount = selector.select();
                } else {
                    keycount = selector.select(readTimeout);
                }
            }
            if (readTimeout > 0 && (selector == null || keycount == 0))
                timedout = (System.currentTimeMillis() - time) >= readTimeout;
        }
        //while
        if (timedout)
            throw new SocketTimeoutException();
    } finally {
        if (key != null) {
            key.cancel();
            //removes the key from this selector
            if (selector != null)
                selector.selectNow();
        }
    }
    return read;
}

Example 9 with SelectionKey

use of java.nio.channels.SelectionKey in project tomcat by apache.

the class NioSelectorPool method write.

/**
     * Performs a write using the bytebuffer for data to be written and a
     * selector to block (if blocking is requested). If the
     * <code>selector</code> parameter is null, and blocking is requested then
     * it will perform a busy write that could take up a lot of CPU cycles.
     * @param buf           The buffer containing the data, we will write as long as <code>(buf.hasRemaining()==true)</code>
     * @param socket        The socket to write data to
     * @param selector      The selector to use for blocking, if null then a busy write will be initiated
     * @param writeTimeout  The timeout for this write operation in milliseconds, -1 means no timeout
     * @param block         <code>true</code> to perform a blocking write
     *                      otherwise a non-blocking write will be performed
     * @return int - returns the number of bytes written
     * @throws EOFException if write returns -1
     * @throws SocketTimeoutException if the write times out
     * @throws IOException if an IO Exception occurs in the underlying socket logic
     */
public int write(ByteBuffer buf, NioChannel socket, Selector selector, long writeTimeout, boolean block) throws IOException {
    if (SHARED && block) {
        return blockingSelector.write(buf, socket, writeTimeout);
    }
    SelectionKey key = null;
    int written = 0;
    boolean timedout = false;
    //assume we can write
    int keycount = 1;
    //start the timeout timer
    long time = System.currentTimeMillis();
    try {
        while ((!timedout) && buf.hasRemaining()) {
            int cnt = 0;
            if (keycount > 0) {
                //only write if we were registered for a write
                //write the data
                cnt = socket.write(buf);
                if (cnt == -1)
                    throw new EOFException();
                written += cnt;
                if (cnt > 0) {
                    //reset our timeout timer
                    time = System.currentTimeMillis();
                    //we successfully wrote, try again without a selector
                    continue;
                }
                //don't block
                if (cnt == 0 && (!block))
                    break;
            }
            if (selector != null) {
                //register OP_WRITE to the selector
                if (key == null)
                    key = socket.getIOChannel().register(selector, SelectionKey.OP_WRITE);
                else
                    key.interestOps(SelectionKey.OP_WRITE);
                if (writeTimeout == 0) {
                    timedout = buf.hasRemaining();
                } else if (writeTimeout < 0) {
                    keycount = selector.select();
                } else {
                    keycount = selector.select(writeTimeout);
                }
            }
            if (writeTimeout > 0 && (selector == null || keycount == 0))
                timedout = (System.currentTimeMillis() - time) >= writeTimeout;
        }
        //while
        if (timedout)
            throw new SocketTimeoutException();
    } finally {
        if (key != null) {
            key.cancel();
            //removes the key from this selector
            if (selector != null)
                selector.selectNow();
        }
    }
    return written;
}

Example 10 with SelectionKey

use of java.nio.channels.SelectionKey in project tomcat by apache.

the class SecureNioChannel method rehandshake.

/**
     * Force a blocking handshake to take place for this key.
     * This requires that both network and application buffers have been emptied out prior to this call taking place, or a
     * IOException will be thrown.
     * @param timeout - timeout in milliseconds for each socket operation
     * @throws IOException - if an IO exception occurs or if application or network buffers contain data
     * @throws SocketTimeoutException - if a socket operation timed out
     */
// key cannot be null
@SuppressWarnings("null")
public void rehandshake(long timeout) throws IOException {
    //validate the network buffers are empty
    if (netInBuffer.position() > 0 && netInBuffer.position() < netInBuffer.limit())
        throw new IOException(sm.getString("channel.nio.ssl.netInputNotEmpty"));
    if (netOutBuffer.position() > 0 && netOutBuffer.position() < netOutBuffer.limit())
        throw new IOException(sm.getString("channel.nio.ssl.netOutputNotEmpty"));
    if (!getBufHandler().isReadBufferEmpty())
        throw new IOException(sm.getString("channel.nio.ssl.appInputNotEmpty"));
    if (!getBufHandler().isWriteBufferEmpty())
        throw new IOException(sm.getString("channel.nio.ssl.appOutputNotEmpty"));
    handshakeComplete = false;
    boolean isReadable = false;
    boolean isWriteable = false;
    boolean handshaking = true;
    Selector selector = null;
    SelectionKey key = null;
    try {
        sslEngine.beginHandshake();
        handshakeStatus = sslEngine.getHandshakeStatus();
        while (handshaking) {
            int hsStatus = this.handshake(isReadable, isWriteable);
            switch(hsStatus) {
                case -1:
                    throw new EOFException(sm.getString("channel.nio.ssl.eofDuringHandshake"));
                case 0:
                    handshaking = false;
                    break;
                default:
                    {
                        long now = System.currentTimeMillis();
                        if (selector == null) {
                            selector = Selector.open();
                            key = getIOChannel().register(selector, hsStatus);
                        } else {
                            // null warning supressed
                            key.interestOps(hsStatus);
                        }
                        int keyCount = selector.select(timeout);
                        if (keyCount == 0 && ((System.currentTimeMillis() - now) >= timeout)) {
                            throw new SocketTimeoutException(sm.getString("channel.nio.ssl.timeoutDuringHandshake"));
                        }
                        isReadable = key.isReadable();
                        isWriteable = key.isWritable();
                    }
            }
        }
    } catch (IOException x) {
        throw x;
    } catch (Exception cx) {
        IOException x = new IOException(cx);
        throw x;
    } finally {
        if (key != null)
            try {
                key.cancel();
            } catch (Exception ignore) {
            }
        if (selector != null)
            try {
                selector.close();
            } catch (Exception ignore) {
            }
    }
}