private void initializeWriting() throws JMSException {
checkReadOnlyBody();
if (this.dataOut == null) {
this.bytesOut = new ByteArrayOutputStream();
OutputStream os = bytesOut;
ActiveMQConnection connection = getConnection();
if (connection != null && connection.isUseCompression()) {
// keep track of the real length of the content if
// we are compressed.
try {
os.write(new byte[4]);
} catch (IOException e) {
throw JMSExceptionSupport.create(e);
}
length = 0;
compressed = true;
final Deflater deflater = new Deflater(Deflater.BEST_SPEED);
os =
new FilterOutputStream(new DeflaterOutputStream(os, deflater)) {
@Override
public void write(byte[] arg0) throws IOException {
length += arg0.length;
out.write(arg0);
}
@Override
public void write(byte[] arg0, int arg1, int arg2) throws IOException {
length += arg2;
out.write(arg0, arg1, arg2);
}
@Override
public void write(int arg0) throws IOException {
length++;
out.write(arg0);
}
@Override
public void close() throws IOException {
super.close();
deflater.end();
}
};
}
this.dataOut = new DataOutputStream(os);
}
}
