org.springframework.cloud.netflix.eureka.EurekaDiscoveryClient Java Examples

public List<ServiceInstance> getInstances(String serviceId) {
    List<InstanceInfo> infos = cloudEurekaClient.get().getInstancesByVipAddress(serviceId,
            false);
    List<ServiceInstance> instances = new ArrayList<>();
    for (InstanceInfo info : infos) {
        EurekaDiscoveryClient.EurekaServiceInstance eurekaServiceInstance = new EurekaDiscoveryClient.EurekaServiceInstance(info);
        instances.add(eurekaServiceInstance);
    }
    return instances;
}
 

@Test
void givenServiceId_whenChoose_thenProducesServiceInstance() {
    ApimlRetryableClient client = new ApimlRetryableClient(
        httpClient, config, introspector, retryFactory
    );
    doReturn(new Server("aaa", 22)).when(lb).chooseServer(any());
    RequestContextUtils.setInstanceInfo(
        InstanceInfo.Builder.newBuilder().setAppName("Sonya").build()
    );
    client.setLoadBalancer(lb);

    ServiceInstance instance = client.choose("service1");

    assertThat(instance, instanceOf(EurekaDiscoveryClient.EurekaServiceInstance.class));
}
 

@Test
public void discoveryClientIsEureka() {
	assertTrue("discoveryClient is wrong type", discoveryClient instanceof CompositeDiscoveryClient);
	assertTrue("composite discovery client should have a Eureka client with higher precendence",
			((CompositeDiscoveryClient) discoveryClient).getDiscoveryClients()
					.get(0) instanceof EurekaDiscoveryClient);
}
 

@Test
public void discoveryClientIsEureka() {
	assertTrue("discoveryClient is wrong type", discoveryClient instanceof CompositeDiscoveryClient);
	assertTrue("composite discovery client should compose Eureka Discovery Client with highest precedence",
			((CompositeDiscoveryClient) discoveryClient).getDiscoveryClients()
					.get(0) instanceof EurekaDiscoveryClient);
}
 

@Test
public void discoveryClientIsEureka() {
	assertTrue("discoveryClient is wrong type: " + discoveryClient,
			discoveryClient instanceof CompositeDiscoveryClient);
	assertTrue("composite discovery client should have a Eureka client with higher precendence",
			((CompositeDiscoveryClient) discoveryClient).getDiscoveryClients()
					.get(0) instanceof EurekaDiscoveryClient);
}
 

@Test
public void testDiscoveryClientIsEureka() {
	assertTrue("discoveryClient is wrong instance type", discoveryClient instanceof CompositeDiscoveryClient);
	assertTrue("composite discovery client should have a Eureka client with higher precendence",
			((CompositeDiscoveryClient) discoveryClient).getDiscoveryClients()
					.get(0) instanceof EurekaDiscoveryClient);
}
 

@Test
public void discoveryClientIsEureka() {
	assertTrue("discoveryClient is wrong type " + discoveryClient.getClass(),
			discoveryClient instanceof CompositeDiscoveryClient);
	CompositeDiscoveryClient compositeDiscoveryClient = (CompositeDiscoveryClient) discoveryClient;
	assertTrue("composite discovery client should be composed of Eureka and Simple Discovery client's",
			compositeDiscoveryClient.getDiscoveryClients().size() == 2);

	assertTrue("the composed discovery client should have a EurekaDiscoveryClient with a higher precedence ",
			compositeDiscoveryClient.getDiscoveryClients().get(0) instanceof EurekaDiscoveryClient);
}
 

@Test
public void discoveryClientIsEureka() {
	assertTrue("discoveryClient is wrong type " + discoveryClient.getClass(),
			discoveryClient instanceof CompositeDiscoveryClient);
	CompositeDiscoveryClient compositeDiscoveryClient = (CompositeDiscoveryClient) discoveryClient;
	assertTrue("composite discovery client should be composed of Eureka and Simple Discovery client's",
			compositeDiscoveryClient.getDiscoveryClients().size() == 2);

	assertTrue("the composed discovery client should have a EurekaDiscoveryClient with a higher precedence ",
			compositeDiscoveryClient.getDiscoveryClients().get(0) instanceof EurekaDiscoveryClient);

	assertTrue("the composed discovery client should have a SimpleDiscoveryClient with a lower precedence ",
			compositeDiscoveryClient.getDiscoveryClients().get(1) instanceof SimpleDiscoveryClient);
}
 

public String serviceInstanceURL(String serviceName, String instanceId) {
	// FORM LIST OF INSTANCES FOR SERVICENAME
	List<ServiceInstance> instances = discoveryClient.getInstances(serviceName);

	String returnHostAndPort = "";

	// IF AN "INSTANCEID" VALUE WAS PASSED IN, THEN FIND THAT PARTICULAR ONE
	// ELSE JUST PICK A RANDOM INSTANCE FOR THE SERVICENAME
	if(!instanceId.equals("")) { 
		// LOOP THROUGH SERVICEINSTANCES OF SERVICE, ATTEMPING TO MATCH ON INSTANCEID
		for (Iterator<ServiceInstance> iterator = instances.iterator(); iterator.hasNext();) {
			EurekaDiscoveryClient.EurekaServiceInstance serviceInstance = (EurekaDiscoveryClient.EurekaServiceInstance) iterator.next();

			String tmpInstanceId = serviceInstance.getInstanceInfo().getInstanceId();
			//System.out.println(tmpInstanceId);
			
			if(tmpInstanceId.equals(instanceId)) {
				returnHostAndPort = serviceInstance.getHost() + ":" + serviceInstance.getPort() + "/";
				break;
			}
		}
	} else {
		Random rn = new Random();
		int range = instances.size();
		int randomNum = rn.nextInt(range);
		ServiceInstance rndm = instances.get(randomNum);
		returnHostAndPort = rndm.getHost() + ":" + rndm.getPort() + "/";
	}

	return returnHostAndPort;
}
 

/**
 * Override method from {@link com.netflix.client.AbstractLoadBalancerAwareClient} because it constructs
 * a {@link RibbonLoadBalancerClient.RibbonServer} that is not fit for our use. Namely, it's getUri() method always returns http scheme, causing the
 * retryable client to always call http. We have stored the instance info from the load balancer in the context
 * so we recreate EurekaServiceInstance here, which correctly resolves whether instance is http or https when asked.
 * @param serviceId
 * @return EurekaServiceInstance
 */
@Override
public ServiceInstance choose(String serviceId) {
    super.choose(serviceId);
    return new EurekaDiscoveryClient.EurekaServiceInstance(
        RequestContextUtils.getInstanceInfo().orElseThrow(() -> new RequestContextNotPreparedException("request context not prepared")));
}