/**
* Retrieve instance of {@link HystrixConcurrencyStrategy} to use based on order of precedence as
* defined in {@link HystrixPlugins} class header.
*
* <p>Override default by using {@link #registerConcurrencyStrategy(HystrixConcurrencyStrategy)}
* or setting property: <code>hystrix.plugin.HystrixConcurrencyStrategy.implementation</code> with
* the full classname to load.
*
* @return {@link HystrixConcurrencyStrategy} implementation to use
*/
public HystrixConcurrencyStrategy getConcurrencyStrategy() {
if (concurrencyStrategy.get() == null) {
// check for an implementation from System.getProperty first
Object impl = getPluginImplementationViaProperty(HystrixConcurrencyStrategy.class);
if (impl == null) {
// nothing set via properties so initialize with default
concurrencyStrategy.compareAndSet(null, HystrixConcurrencyStrategyDefault.getInstance());
// we don't return from here but call get() again in case of thread-race so the winner will
// always get returned
} else {
// we received an implementation from the system property so use it
concurrencyStrategy.compareAndSet(null, (HystrixConcurrencyStrategy) impl);
}
}
return concurrencyStrategy.get();
}
@Test
public void testClearCache() {
HystrixConcurrencyStrategy strategy = HystrixConcurrencyStrategyDefault.getInstance();
HystrixRequestContext context = HystrixRequestContext.initializeContext();
try {
HystrixRequestCache cache1 =
HystrixRequestCache.getInstance(HystrixCommandKey.Factory.asKey("command1"), strategy);
cache1.putIfAbsent("valueA", new TestObservable("a1"));
assertEquals("a1", cache1.get("valueA").toBlocking().last());
cache1.clear("valueA");
assertNull(cache1.get("valueA"));
} catch (Exception e) {
fail("Exception: " + e.getMessage());
e.printStackTrace();
} finally {
context.shutdown();
}
}