/**
* Generic function to send either a ping or a pong.
*
* @param data Optional message.
* @param opcode The byte to include as the opcode.
* @throws IOException If an error occurs writing to the client
*/
private void sendControlMessage(ByteBuffer data, byte opcode) throws IOException {
try {
synchronized (stateLock) {
if (closed) {
throw new IOException(sm.getString("outbound.closed"));
}
doFlush(false);
upgradeOutbound.write(0x80 | opcode);
if (data == null) {
upgradeOutbound.write(0);
} else {
upgradeOutbound.write(data.limit() - data.position());
upgradeOutbound.write(data.array(), data.position(), data.limit() - data.position());
}
upgradeOutbound.flush();
}
} catch (IOException ioe) {
// Any IOException is terminal. Make sure the Inbound side knows
// that something went wrong.
// The exception handling needs to be outside of the sync to avoid
// possible deadlocks (e.g. BZ55524) when triggering the inbound
// close as that will execute user code
streamInbound.doOnClose(Constants23.getStatusClosedUnexpectedly());
throw ioe;
}
}
/**
* Writes the provided bytes as the payload in a new WebSocket frame.
*
* @param buffer The bytes to include in the payload.
* @param finalFragment Do these bytes represent the final fragment of a WebSocket message?
* @throws IOException
*/
private void doWriteBytes(ByteBuffer buffer, boolean finalFragment) throws IOException {
if (closed) {
throw new IOException(sm.getString("outbound.closed"));
}
// Work out the first byte
int first = 0x00;
if (finalFragment) {
first = first + 0x80;
}
if (firstFrame) {
if (text.booleanValue()) {
first = first + 0x1;
} else {
first = first + 0x2;
}
}
// Continuation frame is OpCode 0
upgradeOutbound.write(first);
if (buffer.limit() < 126) {
upgradeOutbound.write(buffer.limit());
} else if (buffer.limit() < 65536) {
upgradeOutbound.write(126);
upgradeOutbound.write(buffer.limit() >>> 8);
upgradeOutbound.write(buffer.limit() & 0xFF);
} else {
// Will never be more than 2^31-1
upgradeOutbound.write(127);
upgradeOutbound.write(0);
upgradeOutbound.write(0);
upgradeOutbound.write(0);
upgradeOutbound.write(0);
upgradeOutbound.write(buffer.limit() >>> 24);
upgradeOutbound.write(buffer.limit() >>> 16);
upgradeOutbound.write(buffer.limit() >>> 8);
upgradeOutbound.write(buffer.limit() & 0xFF);
}
// Write the content
upgradeOutbound.write(buffer.array(), buffer.arrayOffset(), buffer.limit());
upgradeOutbound.flush();
// Reset
if (finalFragment) {
text = null;
firstFrame = true;
} else {
firstFrame = false;
}
bb.clear();
}
/**
* Send a close message to the client
*
* @param status Must be a valid status code or zero to send no code
* @param data Optional message. If message is defined, a valid status code must be provided.
* @throws IOException If an error occurs writing to the client
*/
public void close(int status, ByteBuffer data) throws IOException {
try {
synchronized (stateLock) {
if (closed) {
return;
}
// Send any partial data we have
try {
doFlush(false);
} finally {
closed = true;
}
upgradeOutbound.write(0x88);
if (status == 0) {
upgradeOutbound.write(0);
} else if (data == null || data.position() == data.limit()) {
upgradeOutbound.write(2);
upgradeOutbound.write(status >>> 8);
upgradeOutbound.write(status);
} else {
upgradeOutbound.write(2 + data.limit() - data.position());
upgradeOutbound.write(status >>> 8);
upgradeOutbound.write(status);
upgradeOutbound.write(data.array(), data.position(), data.limit() - data.position());
}
upgradeOutbound.flush();
bb = null;
cb = null;
upgradeOutbound = null;
}
} catch (IOException ioe) {
// Any IOException is terminal. Make sure the Inbound side knows
// that something went wrong.
// The exception handling needs to be outside of the sync to avoid
// possible deadlocks (e.g. BZ55524) when triggering the inbound
// close as that will execute user code
streamInbound.doOnClose(Constants23.getStatusClosedUnexpectedly());
throw ioe;
}
}