| Methods Summary |
|---|
| public void | connect()
if (mConnected) {
throw new ImException("Already connected");
}
mStopped = false;
mStopRetry = false;
mSendQueue = new LinkedBlockingQueue<Primitive>();
mReceiveQueue = new LinkedBlockingQueue<Primitive>();
mSendThread = new Thread(this, "HttpDataChannel");
mSendThread.setDaemon(true);
mSendThread.start();
mConnected = true;
|
| private void | doSendPrimitive(Primitive p)Sends a primitive to the IMPS server through HTTP.
String errorInfo = null;
int retryCount = 0;
long retryDelay = INIT_RETRY_DELAY_MS;
while (retryCount < MAX_RETRY_COUNT) {
try {
trySend(p);
return;
} catch (IOException e) {
errorInfo = e.getLocalizedMessage();
String type = p.getType();
if (ImpsTags.Login_Request.equals(type)
|| ImpsTags.Logout_Request.equals(type)) {
// we don't retry to send login/logout request. The request
// might be sent to the server successfully but we failed to
// get the response from the server. Retry in this case might
// cause multiple login which is not allowed by some server.
break;
}
if (p.getTransactionMode() == TransactionMode.Response) {
// Ignore the failure of sending response to the server since
// it's only an acknowledgment. When we get here, the
// primitive might have been sent successfully but failed to
// get the http response. The server might or might not send
// the request again if it does not receive the acknowledgment,
// the client is ok to either case.
return;
}
retryCount++;
// sleep for a while and retry to send the primitive in a new
// transaction if we havn't met the max retry count.
if (retryCount < MAX_RETRY_COUNT) {
mTxManager.reassignTransactionId(p);
Log.w(ImpsLog.TAG, "Send primitive failed, retry after " + retryDelay + "ms");
synchronized (mRetryLock) {
try {
mRetryLock.wait(retryDelay);
} catch (InterruptedException ignore) {
}
if (mStopRetry) {
break;
}
}
retryDelay = retryDelay * 2;
if (retryDelay > MAX_RETRY_DELAY_MS) {
retryDelay = MAX_RETRY_DELAY_MS;
}
}
}
}
Log.w(ImpsLog.TAG, "Failed to send primitive after " + MAX_RETRY_COUNT + " retries");
mTxManager.notifyErrorResponse(p.getTransactionID(),
ImErrorInfo.NETWORK_ERROR, errorInfo);
|
| public long | getLastActiveTime()
return mLastActive;
|
| public boolean | isSendingQueueEmpty()
if (!mConnected || mStopped) {
throw new IllegalStateException();
}
return mSendQueue.isEmpty();
|
| private boolean | needSendKeepAlive(long inactiveTime)
return mKeepAliveMillis - inactiveTime <= 500;
|
| public Primitive | receivePrimitive()
if (!mConnected || mStopped) {
throw new IllegalStateException();
}
return mReceiveQueue.take();
|
| public boolean | resume()
long now = SystemClock.elapsedRealtime();
if (now - mLastActive > mKeepAliveMillis) {
shutdown();
return false;
} else {
mSuspended = false;
// Send a polling request after resume in case we missed some
// updates while we are suspended.
Primitive polling = new Primitive(ImpsTags.Polling_Request);
polling.setSession(mConnection.getSession().getID());
sendPrimitive(polling);
startHeartbeat();
return true;
}
|
| public void | run()
while (!mStopped) {
try {
Primitive primitive = mSendQueue.take();
if (primitive.getType().equals(ImpsTags.Polling_Request)) {
mHasPendingPolling.set(false);
}
doSendPrimitive(primitive);
} catch (InterruptedException e) {
}
}
mHttpClient.close();
|
| public long | sendHeartbeat()
if (mSuspended) {
return 0;
}
long inactiveTime = SystemClock.elapsedRealtime() - mLastActive;
if (needSendKeepAlive(inactiveTime)) {
sendKeepAlive();
return mKeepAliveMillis;
} else {
return mKeepAliveMillis - inactiveTime;
}
|
| private void | sendKeepAlive()
ImpsTransactionManager tm = mConnection.getTransactionManager();
AsyncTransaction tx = new AsyncTransaction(tm) {
@Override
public void onResponseError(ImpsErrorInfo error) {
}
@Override
public void onResponseOk(Primitive response) {
// Since we never request a new timeout value, the response
// can be ignored
}
};
tx.sendRequest(mKeepAlivePrimitive);
|
| public void | sendPrimitive(Primitive p)
if (!mConnected || mStopped) {
ImpsLog.log("DataChannel not connected, ignore primitive " + p.getType());
return;
}
if (ImpsTags.Polling_Request.equals(p.getType())) {
if (!mHasPendingPolling.compareAndSet(false, true)) {
ImpsLog.log("HttpDataChannel: Ignoring Polling-Request");
return;
}
} else if (ImpsTags.Logout_Request.equals(p.getType())) {
mStopRetry = true;
synchronized (mRetryLock) {
mRetryLock.notify();
}
}
if (!mSendQueue.offer(p)) {
// This is almost impossible for a LinkedBlockingQueue. We don't
// even bother to assign an error code for this. ;)
mTxManager.notifyErrorResponse(p.getTransactionID(),
ImErrorInfo.UNKNOWN_ERROR, "sending queue full");
}
|
| public void | shutdown()
HeartbeatService heartbeatService
= SystemService.getDefault().getHeartbeatService();
if (heartbeatService != null) {
heartbeatService.stopHeartbeat(this);
}
// Stop the sending thread
mStopped = true;
mSendThread.interrupt();
mConnected = false;
|
| private void | startHeartbeat()
HeartbeatService heartbeatService
= SystemService.getDefault().getHeartbeatService();
if (heartbeatService != null) {
heartbeatService.startHeartbeat(this, mKeepAliveMillis);
}
|
| public void | startKeepAlive(long interval)
if (!mConnected || mStopped) {
throw new IllegalStateException();
}
if (interval <= 0) {
interval = mConnection.getConfig().getDefaultKeepAliveInterval();
}
mKeepAliveMillis = interval * 1000;
if (mKeepAliveMillis < 0) {
ImpsLog.log("Negative keep alive time. Won't send keep-alive");
}
mKeepAlivePrimitive = new Primitive(ImpsTags.KeepAlive_Request);
startHeartbeat();
|
| public void | suspend()
mSuspended = true;
|
| private void | trySend(Primitive p)
ByteArrayOutputStream out = new ByteArrayOutputStream();
try {
mSerializer.serialize(p, out);
} catch (SerializerException e) {
mTxManager.notifyErrorResponse(p.getTransactionID(),
ImErrorInfo.SERIALIZER_ERROR,
"Internal serializer error, primitive: " + p.getType());
out.close();
return;
}
HttpPost req = new HttpPost(mPostUri);
req.addHeader(mContentTypeHeader);
if (mMsisdnHeader != null) {
req.addHeader(mMsisdnHeader);
}
ByteArrayEntity entity = new ByteArrayEntity(out.toByteArray());
req.setEntity(entity);
mLastActive = SystemClock.elapsedRealtime();
if (Log.isLoggable(ImpsLog.TAG, Log.DEBUG)) {
long sendBytes = entity.getContentLength() + 176 /* approx. header length */;
ImpsLog.log(mConnection.getLoginUserName() + " >> " + p.getType() + " HTTP payload approx. " + sendBytes + " bytes");
}
if (Log.isLoggable(ImpsLog.PACKET_TAG, Log.DEBUG)) {
ImpsLog.dumpRawPacket(out.toByteArray());
ImpsLog.dumpPrimitive(p);
}
HttpResponse res = mHttpClient.execute(req);
StatusLine statusLine = res.getStatusLine();
HttpEntity resEntity = res.getEntity();
InputStream in = resEntity.getContent();
if (Log.isLoggable(ImpsLog.PACKET_TAG, Log.DEBUG)) {
Log.d(ImpsLog.PACKET_TAG, statusLine.toString());
Header[] headers = res.getAllHeaders();
for (Header h : headers) {
Log.d(ImpsLog.PACKET_TAG, h.toString());
}
int len = (int) resEntity.getContentLength();
if (len > 0) {
byte[] content = new byte[len];
int offset = 0;
int bytesRead = 0;
do {
bytesRead = in.read(content, offset, len);
offset += bytesRead;
len -= bytesRead;
} while (bytesRead > 0);
in.close();
ImpsLog.dumpRawPacket(content);
in = new ByteArrayInputStream(content);
}
}
try {
if (statusLine.getStatusCode() != HttpURLConnection.HTTP_OK) {
mTxManager.notifyErrorResponse(p.getTransactionID(), statusLine.getStatusCode(),
statusLine.getReasonPhrase());
return;
}
if (resEntity.getContentLength() == 0) {
// empty responses are only valid for Polling-Request or
// server initiated transactions
if ((p.getTransactionMode() != TransactionMode.Response)
&& !p.getType().equals(ImpsTags.Polling_Request)) {
mTxManager.notifyErrorResponse(p.getTransactionID(),
ImErrorInfo.ILLEGAL_SERVER_RESPONSE,
"bad response from server");
}
return;
}
Primitive response = mParser.parse(in);
if (Log.isLoggable(ImpsLog.PACKET_TAG, Log.DEBUG)) {
ImpsLog.dumpPrimitive(response);
}
if (Log.isLoggable(ImpsLog.TAG, Log.DEBUG)) {
long len = 2 + resEntity.getContentLength() + statusLine.toString().length() + 2;
Header[] headers = res.getAllHeaders();
for (Header header : headers) {
len += header.getName().length() + header.getValue().length() + 4;
}
ImpsLog.log(mConnection.getLoginUserName() + " << "
+ response.getType() + " HTTP payload approx. " + len + "bytes");
}
if (!mReceiveQueue.offer(response)) {
// This is almost impossible for a LinkedBlockingQueue.
// We don't even bother to assign an error code for it.
mTxManager.notifyErrorResponse(p.getTransactionID(),
ImErrorInfo.UNKNOWN_ERROR, "receiving queue full");
}
} catch (ParserException e) {
ImpsLog.logError(e);
mTxManager.notifyErrorResponse(p.getTransactionID(),
ImErrorInfo.PARSER_ERROR,
"Parser error, received a bad response from server");
} finally {
//consume all the content so that the connection can be re-used.
resEntity.consumeContent();
}
|
