/**
* Handle a request after its type is determined. The request is scheduled for execution. If the
* server has enough free resources, the client will be served immediately. If time runs out, the
* client will be asked to come back later with a reference to the result.
*
* <p>Override: Previously, the wrapper added the handle agent logging. The entire handle method
* is now overridden to: 1 - prevent redundant requests from processing (ran or running) 2 - avoid
* taxing the same data source the request requires for processing
*
* @throws ExceptionReport
*/
@Override
public void handle() throws ExceptionReport {
Response resp = null;
if (req == null) {
throw new ExceptionReport("Internal Error", "");
}
handleAgentLogging(); // USGS override logic: inserts the user_agent into the meta-data table.
// Required the requestId for the insert.
if (req instanceof ExecuteRequestWrapper) {
ExecuteRequestWrapper execReq = (ExecuteRequestWrapper) req; // #USGS override code
LOGGER.debug("RequestId before updating to Accepted:" + execReq.getUniqueId());
execReq.updateStatusAccepted();
ExecuteRequestManager.getInstance()
.getThrottleQueue()
.putRequest(
execReq); // inserts with ACCEPTED into the Throttle_Queue table. Does not actually
// add the request to the RequestQueue.
if (execReq.isStoreResponse()) {
addToQueue(execReq, resp);
} else {
synchAddToQueue(execReq, resp);
}
} else { // if ExecuteRequest
// for GetCapabilities and DescribeProcess:
resp = req.call();
try {
InputStream is = resp.getAsStream();
IOUtils.copy(is, os);
is.close();
} catch (IOException e) {
throw new ExceptionReport(
"Could not read from response stream.", ExceptionReport.NO_APPLICABLE_CODE);
}
}
}
private void synchAddToQueue(ExecuteRequestWrapper execReq, Response resp)
throws ExceptionReport {
try {
LOGGER.info("Adding to queue synchronously.");
// add to queue even though the user is waiting ie synchronous <test> this may block the
// asynch requests
resp =
ExecuteRequestManager.getInstance()
.getExecuteRequestQueue()
.put(execReq); // #USGS pool.submit
} catch (RejectedExecutionException ree) {
LOGGER.warn("exception handling ExecuteRequest.", ree);
// server too busy?
throw new ExceptionReport(
"The requested process was rejected. Maybe the server is flooded with requests.",
ExceptionReport.SERVER_BUSY);
} finally {
if (resp == null) {
LOGGER.warn("null response handling ExecuteRequest.");
throw new ExceptionReport(
"Problem with handling threads in GDPRequestHandler",
ExceptionReport.NO_APPLICABLE_CODE);
}
if (!execReq.isStoreResponse()) {
InputStream is = resp.getAsStream();
try {
IOUtils.copy(is, os);
is.close();
} catch (IOException ex) {
// java.util.logging.Logger.getLogger(GdpRequestHandler.class.getName()).log(Level.SEVERE,
// null, ex);
LOGGER.error("Error getting stream from response in synchronous add to queue: ", ex);
}
LOGGER.info("Served ExecuteRequest.");
}
}
}
