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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.config.proxy;
import com.yahoo.vespa.config.ConfigCacheKey;
import com.yahoo.vespa.config.RawConfig;
import com.yahoo.vespa.config.protocol.JRTServerConfigRequest;
import com.yahoo.yolean.Exceptions;
import java.util.Optional;
import java.util.concurrent.atomic.AtomicLong;
import java.util.logging.Level;
import java.util.logging.Logger;
import static com.yahoo.protect.Process.logAndDie;
/**
* The run method of this class is executed periodically to return delayed responses
* (requests use long polling, so config proxy needs to return a response when they time out).
*
* @author hmusum
*/
public class DelayedResponseHandler implements Runnable {
private final static Logger log = Logger.getLogger(DelayedResponseHandler.class.getName());
private final DelayedResponses delayedResponses;
private final MemoryCache memoryCache;
private final ResponseHandler responseHandler;
private final AtomicLong sentResponses = new AtomicLong();
DelayedResponseHandler(DelayedResponses delayedResponses, MemoryCache memoryCache, ResponseHandler responseHandler) {
this.delayedResponses = delayedResponses;
this.memoryCache = memoryCache;
this.responseHandler = responseHandler;
}
@Override
public void run() {
checkDelayedResponses();
}
void checkDelayedResponses() {
try {
long start = System.currentTimeMillis();
log.log(Level.FINEST, () -> "Running DelayedResponseHandler. There are " + delayedResponses.size() +
" delayed responses. First one is " + delayedResponses.responses().peek());
DelayedResponse response;
while ((response = delayedResponses.responses().poll()) != null) {
JRTServerConfigRequest request = response.getRequest();
ConfigCacheKey cacheKey = new ConfigCacheKey(request.getConfigKey(), request.getRequestDefMd5());
Optional<RawConfig> config = memoryCache.get(cacheKey);
if (config.isPresent()) {
responseHandler.returnOkResponse(request, config.get());
sentResponses.incrementAndGet();
} else {
log.log(Level.INFO, "Timed out (timeout " + request.getTimeout() + ") getting config " +
request.getConfigKey() + ", will retry");
}
}
log.log(Level.FINEST, () -> "Finished running DelayedResponseHandler. " + sentResponses.get() +
" delayed responses sent in " + (System.currentTimeMillis() - start) + " ms");
} catch (Exception e) { // To avoid thread throwing exception and executor never running this again
log.log(Level.WARNING, "Got exception in DelayedResponseHandler: " + Exceptions.toMessageString(e));
} catch (Throwable e) {
logAndDie("Got error in DelayedResponseHandler, exiting: " + Exceptions.toMessageString(e));
}
}
public long sentResponses() { return sentResponses.get(); }
}
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