public virtual void Run()
{
running = true;
HttpClient httpClient;
if (client == null)
{
// This is a race condition that can be reproduced by calling cbpuller.start() and cbpuller.stop()
// directly afterwards. What happens is that by the time the Changetracker thread fires up,
// the cbpuller has already set this.client to null. See issue #109
Log.W(Log.TagChangeTracker, "%s: ChangeTracker run() loop aborting because client == null"
, this);
return;
}
if (mode == ChangeTracker.ChangeTrackerMode.Continuous)
{
// there is a failing unit test for this, and from looking at the code the Replication
// object will never use Continuous mode anyway. Explicitly prevent its use until
// it is demonstrated to actually work.
throw new RuntimeException("ChangeTracker does not correctly support continuous mode"
);
}
httpClient = client.GetHttpClient();
backoff = new ChangeTrackerBackoff();
while (running)
{
Uri url = GetChangesFeedURL();
if (usePOST)
{
HttpPost postRequest = new HttpPost(url.ToString());
postRequest.SetHeader("Content-Type", "application/json");
StringEntity entity;
try
{
entity = new StringEntity(ChangesFeedPOSTBody());
}
catch (UnsupportedEncodingException e)
{
throw new RuntimeException(e);
}
postRequest.SetEntity(entity);
request = postRequest;
}
else
{
request = new HttpGet(url.ToString());
}
AddRequestHeaders(request);
// Perform BASIC Authentication if needed
bool isUrlBasedUserInfo = false;
// If the URL contains user info AND if this a DefaultHttpClient then preemptively set the auth credentials
string userInfo = url.GetUserInfo();
if (userInfo != null)
{
isUrlBasedUserInfo = true;
}
else
{
if (authenticator != null)
{
AuthenticatorImpl auth = (AuthenticatorImpl)authenticator;
userInfo = auth.AuthUserInfo();
}
}
if (userInfo != null)
{
if (userInfo.Contains(":") && !userInfo.Trim().Equals(":"))
{
string[] userInfoElements = userInfo.Split(":");
string username = isUrlBasedUserInfo ? URIUtils.Decode(userInfoElements[0]) : userInfoElements
[0];
string password = isUrlBasedUserInfo ? URIUtils.Decode(userInfoElements[1]) : userInfoElements
[1];
Credentials credentials = new UsernamePasswordCredentials(username, password);
if (httpClient is DefaultHttpClient)
{
DefaultHttpClient dhc = (DefaultHttpClient)httpClient;
MessageProcessingHandler preemptiveAuth = new _MessageProcessingHandler_285(credentials
);
dhc.AddRequestInterceptor(preemptiveAuth, 0);
}
}
else
{
Log.W(Log.TagChangeTracker, "RemoteRequest Unable to parse user info, not setting credentials"
);
}
}
try
{
string maskedRemoteWithoutCredentials = GetChangesFeedURL().ToString();
maskedRemoteWithoutCredentials = maskedRemoteWithoutCredentials.ReplaceAll("://.*:.*@"
, "://---:---@");
Log.V(Log.TagChangeTracker, "%s: Making request to %s", this, maskedRemoteWithoutCredentials
);
HttpResponse response = httpClient.Execute(request);
StatusLine status = response.GetStatusLine();
if (status.GetStatusCode() >= 300 && !Utils.IsTransientError(status))
{
Log.E(Log.TagChangeTracker, "%s: Change tracker got error %d", this, status.GetStatusCode
());
this.error = new HttpResponseException(status.GetStatusCode(), status.GetReasonPhrase
());
Stop();
}
HttpEntity entity = response.GetEntity();
InputStream input = null;
if (entity != null)
{
try
{
input = entity.GetContent();
if (mode == ChangeTracker.ChangeTrackerMode.LongPoll)
{
// continuous replications
IDictionary<string, object> fullBody = Manager.GetObjectMapper().ReadValue<IDictionary
>(input);
bool responseOK = ReceivedPollResponse(fullBody);
if (mode == ChangeTracker.ChangeTrackerMode.LongPoll && responseOK)
{
Log.V(Log.TagChangeTracker, "%s: Starting new longpoll", this);
backoff.ResetBackoff();
continue;
}
else
{
Log.W(Log.TagChangeTracker, "%s: Change tracker calling stop (LongPoll)", this);
Stop();
}
}
else
{
// one-shot replications
JsonFactory jsonFactory = Manager.GetObjectMapper().GetJsonFactory();
JsonParser jp = jsonFactory.CreateJsonParser(input);
while (jp.NextToken() != JsonToken.StartArray)
{
}
// ignore these tokens
while (jp.NextToken() == JsonToken.StartObject)
{
IDictionary<string, object> change = (IDictionary)Manager.GetObjectMapper().ReadValue
<IDictionary>(jp);
if (!ReceivedChange(change))
{
Log.W(Log.TagChangeTracker, "Received unparseable change line from server: %s", change
);
}
}
Log.W(Log.TagChangeTracker, "%s: Change tracker calling stop (OneShot)", this);
Stop();
break;
}
backoff.ResetBackoff();
}
finally
{
try
{
entity.ConsumeContent();
}
catch (IOException)
{
}
}
}
}
catch (Exception e)
{
if (!running && e is IOException)
{
}
else
{
// in this case, just silently absorb the exception because it
// frequently happens when we're shutting down and have to
// close the socket underneath our read.
Log.E(Log.TagChangeTracker, this + ": Exception in change tracker", e);
}
backoff.SleepAppropriateAmountOfTime();
}
}
Log.V(Log.TagChangeTracker, "%s: Change tracker run loop exiting", this);
}
public virtual void Run()
{
running = true;
HttpClient httpClient;
if (client == null)
{
// This is a race condition that can be reproduced by calling cbpuller.start() and cbpuller.stop()
// directly afterwards. What happens is that by the time the Changetracker thread fires up,
// the cbpuller has already set this.client to null. See issue #109
Log.W(Log.TagChangeTracker, "%s: ChangeTracker run() loop aborting because client == null"
, this);
return;
}
if (mode == ChangeTracker.ChangeTrackerMode.Continuous)
{
// there is a failing unit test for this, and from looking at the code the Replication
// object will never use Continuous mode anyway. Explicitly prevent its use until
// it is demonstrated to actually work.
throw new RuntimeException("ChangeTracker does not correctly support continuous mode"
);
}
httpClient = client.GetHttpClient();
backoff = new ChangeTrackerBackoff();
while (running)
{
Uri url = GetChangesFeedURL();
if (usePOST)
{
HttpPost postRequest = new HttpPost(url.ToString());
postRequest.SetHeader("Content-Type", "application/json");
StringEntity entity;
try
{
entity = new StringEntity(ChangesFeedPOSTBody());
}
catch (UnsupportedEncodingException e)
{
throw new RuntimeException(e);
}
postRequest.SetEntity(entity);
request = postRequest;
}
else
{
request = new HttpGet(url.ToString());
}
AddRequestHeaders(request);
// Perform BASIC Authentication if needed
bool isUrlBasedUserInfo = false;
// If the URL contains user info AND if this a DefaultHttpClient then preemptively set the auth credentials
string userInfo = url.GetUserInfo();
if (userInfo != null)
{
isUrlBasedUserInfo = true;
}
else
{
if (authenticator != null)
{
AuthenticatorImpl auth = (AuthenticatorImpl)authenticator;
userInfo = auth.AuthUserInfo();
}
}
if (userInfo != null)
{
if (userInfo.Contains(":") && !userInfo.Trim().Equals(":"))
{
string[] userInfoElements = userInfo.Split(":");
string username = isUrlBasedUserInfo ? URIUtils.Decode(userInfoElements[0]) : userInfoElements
[0];
string password = isUrlBasedUserInfo ? URIUtils.Decode(userInfoElements[1]) : userInfoElements
[1];
Credentials credentials = new UsernamePasswordCredentials(username, password);
if (httpClient is DefaultHttpClient)
{
DefaultHttpClient dhc = (DefaultHttpClient)httpClient;
MessageProcessingHandler preemptiveAuth = new _MessageProcessingHandler_285(credentials
);
dhc.AddRequestInterceptor(preemptiveAuth, 0);
}
}
else
{
Log.W(Log.TagChangeTracker, "RemoteRequest Unable to parse user info, not setting credentials"
);
}
}
try
{
string maskedRemoteWithoutCredentials = GetChangesFeedURL().ToString();
maskedRemoteWithoutCredentials = maskedRemoteWithoutCredentials.ReplaceAll("://.*:.*@"
, "://---:---@");
Log.V(Log.TagChangeTracker, "%s: Making request to %s", this, maskedRemoteWithoutCredentials
);
HttpResponse response = httpClient.Execute(request);
StatusLine status = response.GetStatusLine();
if (status.GetStatusCode() >= 300 && !Utils.IsTransientError(status))
{
Log.E(Log.TagChangeTracker, "%s: Change tracker got error %d", this, status.GetStatusCode
());
this.error = new HttpResponseException(status.GetStatusCode(), status.GetReasonPhrase
());
Stop();
}
HttpEntity entity = response.GetEntity();
InputStream input = null;
if (entity != null)
{
try
{
input = entity.GetContent();
if (mode == ChangeTracker.ChangeTrackerMode.LongPoll)
{
// continuous replications
IDictionary <string, object> fullBody = Manager.GetObjectMapper().ReadValue <IDictionary
>(input);
bool responseOK = ReceivedPollResponse(fullBody);
if (mode == ChangeTracker.ChangeTrackerMode.LongPoll && responseOK)
{
Log.V(Log.TagChangeTracker, "%s: Starting new longpoll", this);
backoff.ResetBackoff();
continue;
}
else
{
Log.W(Log.TagChangeTracker, "%s: Change tracker calling stop (LongPoll)", this);
Stop();
}
}
else
{
// one-shot replications
JsonFactory jsonFactory = Manager.GetObjectMapper().GetJsonFactory();
JsonParser jp = jsonFactory.CreateJsonParser(input);
while (jp.NextToken() != JsonToken.StartArray)
{
}
// ignore these tokens
while (jp.NextToken() == JsonToken.StartObject)
{
IDictionary <string, object> change = (IDictionary)Manager.GetObjectMapper().ReadValue
<IDictionary>(jp);
if (!ReceivedChange(change))
{
Log.W(Log.TagChangeTracker, "Received unparseable change line from server: %s", change
);
}
}
Log.W(Log.TagChangeTracker, "%s: Change tracker calling stop (OneShot)", this);
Stop();
break;
}
backoff.ResetBackoff();
}
finally
{
try
{
entity.ConsumeContent();
}
catch (IOException)
{
}
}
}
}
catch (Exception e)
{
if (!running && e is IOException)
{
}
else
{
// in this case, just silently absorb the exception because it
// frequently happens when we're shutting down and have to
// close the socket underneath our read.
Log.E(Log.TagChangeTracker, this + ": Exception in change tracker", e);
}
backoff.SleepAppropriateAmountOfTime();
}
}
Log.V(Log.TagChangeTracker, "%s: Change tracker run loop exiting", this);
}