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fix metrics publishing by caching publisher command instances by both command group key + command key #1920

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fix metrics publishing by caching publisher command instances by both command group key + command key #1920

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8 changes: 4 additions & 4 deletions ...re/src/main/java/com/netflix/hystrix/strategy/metrics/HystrixMetricsPublisherFactory.java
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Original file line number Diff line number Diff line change
Expand Up @@ -97,22 +97,22 @@ public static void reset() {

/* package */ HystrixMetricsPublisherFactory() {}

// String is CommandKey.name() (we can't use CommandKey directly as we can't guarantee it implements hashcode/equals correctly)
private final ConcurrentHashMap<String, HystrixMetricsPublisherCommand> commandPublishers = new ConcurrentHashMap<String, HystrixMetricsPublisherCommand>();

/* package */ HystrixMetricsPublisherCommand getPublisherForCommand(HystrixCommandKey commandKey, HystrixCommandGroupKey commandOwner, HystrixCommandMetrics metrics, HystrixCircuitBreaker circuitBreaker, HystrixCommandProperties properties) {
// attempt to retrieve from cache first
HystrixMetricsPublisherCommand publisher = commandPublishers.get(commandKey.name());
String cacheKey = commandOwner.name() + commandKey.name();
HystrixMetricsPublisherCommand publisher = commandPublishers.get(cacheKey);
if (publisher != null) {
return publisher;
} else {
synchronized (this) {
HystrixMetricsPublisherCommand existingPublisher = commandPublishers.get(commandKey.name());
HystrixMetricsPublisherCommand existingPublisher = commandPublishers.get(cacheKey);
if (existingPublisher != null) {
return existingPublisher;
} else {
HystrixMetricsPublisherCommand newPublisher = HystrixPlugins.getInstance().getMetricsPublisher().getMetricsPublisherForCommand(commandKey, commandOwner, metrics, circuitBreaker, properties);
commandPublishers.putIfAbsent(commandKey.name(), newPublisher);
commandPublishers.putIfAbsent(cacheKey, newPublisher);
newPublisher.initialize();
return newPublisher;
}
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