public static void main(String... args) {
// initialize
DiscoveryAndLoadBalancer.getFactory();
// hystrix stream => http://localhost:9999
startHystrixMetricsStream();
System.out.println("Server => Starting at http://localhost:8080/");
System.out.println(" Sample URLs: ");
System.out.println(" - http://localhost:8080/device/home?userId=123");
System.out.println("----------------------------------------------------------------");
// start web services => http://localhost:8080
RxNetty.createHttpServer(
8080,
(request, response) -> {
if (request.getPath().contains("favicon.ico")) {
return Observable.empty();
}
// System.out.println("Server => Request: " + request.getPath());
return Observable.defer(
() -> {
HystrixRequestContext.initializeContext();
try {
return handleRoutes(request, response);
} catch (Throwable e) {
System.err.println("Server => Error [" + request.getPath() + "] => " + e);
response.setStatus(HttpResponseStatus.BAD_REQUEST);
return response.writeStringAndFlush(
"Error 500: Bad Request\n" + e.getMessage() + "\n");
}
})
.onErrorResumeNext(
error -> {
System.err.println("Server => Error: " + error.getMessage());
error.printStackTrace();
return writeError(request, response, "Failed: " + error.getMessage());
})
.doOnTerminate(
() -> {
if (HystrixRequestContext.isCurrentThreadInitialized()) {
System.out.println(
"Server => Request ["
+ request.getPath()
+ "] => "
+ HystrixRequestLog.getCurrentRequest()
.getExecutedCommandsAsString());
HystrixRequestContext.getContextForCurrentThread().shutdown();
} else {
System.err.println(
"HystrixRequestContext not initialized for thread: "
+ Thread.currentThread());
}
response.close();
});
})
.startAndWait();
}
@Test
public void testCache() {
HystrixConcurrencyStrategy strategy = HystrixConcurrencyStrategyDefault.getInstance();
HystrixRequestContext context = HystrixRequestContext.initializeContext();
try {
HystrixRequestCache cache1 =
HystrixRequestCache.getInstance(HystrixCommandKey.Factory.asKey("command1"), strategy);
cache1.putIfAbsent("valueA", new TestObservable("a1"));
cache1.putIfAbsent("valueA", new TestObservable("a2"));
cache1.putIfAbsent("valueB", new TestObservable("b1"));
HystrixRequestCache cache2 =
HystrixRequestCache.getInstance(HystrixCommandKey.Factory.asKey("command2"), strategy);
cache2.putIfAbsent("valueA", new TestObservable("a3"));
assertEquals("a1", cache1.get("valueA").toBlocking().last());
assertEquals("b1", cache1.get("valueB").toBlocking().last());
assertEquals("a3", cache2.get("valueA").toBlocking().last());
assertNull(cache2.get("valueB"));
} catch (Exception e) {
fail("Exception: " + e.getMessage());
e.printStackTrace();
} finally {
context.shutdown();
}
context = HystrixRequestContext.initializeContext();
try {
// with a new context the instance should have nothing in it
HystrixRequestCache cache =
HystrixRequestCache.getInstance(HystrixCommandKey.Factory.asKey("command1"), strategy);
assertNull(cache.get("valueA"));
assertNull(cache.get("valueB"));
} finally {
context.shutdown();
}
}
@Before
public void setUp() throws Exception {
context = HystrixRequestContext.initializeContext();
}