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// Copyright 2016 Yahoo Inc. 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.log.LogLevel;
import com.yahoo.vespa.config.RawConfig;
import com.yahoo.vespa.config.protocol.JRTServerConfigRequest;
import java.util.concurrent.DelayQueue;
import java.util.logging.Logger;
/**
* Updates clients subscribing to config when config changes or the
* timeout they have specified has elapsed.
*
* @author hmusum
*/
class ClientUpdater {
private final static Logger log = Logger.getLogger(ClientUpdater.class.getName());
private final MemoryCache memoryCache;
private final ConfigProxyStatistics statistics;
private final RpcServer rpcServer;
private final DelayedResponses delayedResponses;
private final Mode mode;
ClientUpdater(MemoryCache memoryCache,
RpcServer rpcServer,
ConfigProxyStatistics statistics,
DelayedResponses delayedResponses,
Mode mode) {
this.memoryCache = memoryCache;
this.rpcServer = rpcServer;
this.statistics = statistics;
this.delayedResponses = delayedResponses;
this.mode = mode;
}
/**
* This method will be called when a response with changed config is received from upstream
* (content or generation has changed) or the server timeout has elapsed.
* Updates the cache with the returned config.
*
* @param config new config
*/
void updateSubscribers(RawConfig config) {
// ignore updates if we are in one of these modes (we will then only serve from cache).
if (!mode.requiresConfigSource()) {
if (log.isLoggable(LogLevel.DEBUG)) {
log.log(LogLevel.DEBUG, "Not updating " + config.getKey() + "," + config.getGeneration() +
", since we are in '" + mode + "' mode");
}
return;
}
if (log.isLoggable(LogLevel.DEBUG)) {
log.log(LogLevel.DEBUG, "Config updated for " + config.getKey() + "," + config.getGeneration());
}
memoryCache.put(config);
sendResponse(config);
}
private void sendResponse(RawConfig config) {
if (config.isError()) { statistics.incErrorCount(); }
if (log.isLoggable(LogLevel.DEBUG)) {
log.log(LogLevel.DEBUG, "Sending response for " + config.getKey() + "," + config.getGeneration());
}
DelayQueue<DelayedResponse> responseDelayQueue = delayedResponses.responses();
if (log.isLoggable(LogLevel.SPAM)) {
log.log(LogLevel.SPAM, "Delayed response queue: " + responseDelayQueue);
}
if (responseDelayQueue.size() == 0) {
log.log(LogLevel.DEBUG, "There exists no matching element on delayed response queue for " + config.getKey());
return;
} else {
if (log.isLoggable(LogLevel.DEBUG)) {
log.log(LogLevel.DEBUG, "Delayed response queue has " + responseDelayQueue.size() + " elements");
}
}
DelayedResponse[] responses = new DelayedResponse[1];
responses = responseDelayQueue.toArray(responses);
boolean found = false;
if (responses.length > 0) {
for (DelayedResponse response : responses) {
JRTServerConfigRequest request = response.getRequest();
if (request.getConfigKey().equals(config.getKey())) {
if (!delayedResponses.remove(response)) {
if (log.isLoggable(LogLevel.DEBUG)) {
log.log(LogLevel.DEBUG, "Could not remove " + config.getKey() + " from delayed delayedResponses queue, already removed");
}
continue;
}
found = true;
if (log.isLoggable(LogLevel.DEBUG)) {
log.log(LogLevel.DEBUG, "Call returnOkResponse for " + config.getKey() + "," + config.getGeneration());
}
rpcServer.returnOkResponse(request, config);
}
}
}
if (!found) {
log.log(LogLevel.DEBUG, "Found no recipient for " + config.getKey() + " in delayed response queue");
}
if (log.isLoggable(LogLevel.DEBUG)) {
log.log(LogLevel.DEBUG, "Finished updating config for " + config.getKey() + "," + config.getGeneration());
}
}
// TODO: Remove, temporary until MapBackedConfigSource has been refactored
public MemoryCache getMemoryCache() {
return memoryCache;
}
}
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