jkuipers’s gists

jkuipers / DnsServerList.java

Created May 31, 2018 21:50

	import com.netflix.loadbalancer.Server;
	import com.netflix.loadbalancer.ServerList;
	import org.slf4j.Logger;
	import org.slf4j.LoggerFactory;

	import java.net.InetAddress;
	import java.net.UnknownHostException;
	import java.security.Security;
	import java.util.ArrayList;
	import java.util.List;

jkuipers / InstrumentedQueueMessagingTemplate.java

Last active May 2, 2019 12:18

Spring Cloud AWS QueueMessagingTemplate subtype which adds Brave and Micrometer.io integration for sending messages

	import brave.Span;
	import brave.Tracer;
	import brave.Tracing;
	import brave.propagation.Propagation;
	import brave.propagation.TraceContext;
	import com.amazonaws.services.sqs.AmazonSQSAsync;
	import io.micrometer.core.instrument.MeterRegistry;
	import io.micrometer.core.instrument.Timer;
	import org.springframework.cloud.aws.messaging.core.QueueMessageChannel;
	import org.springframework.cloud.aws.messaging.core.QueueMessagingTemplate;

jkuipers / ApiKeyHeaderFilter.java

Created November 2, 2018 15:16

	import com.netflix.zuul.ZuulFilter;
	import com.netflix.zuul.context.RequestContext;
	import com.netflix.zuul.exception.ZuulException;

	import static org.springframework.cloud.netflix.zuul.filters.support.FilterConstants.PRE_DECORATION_FILTER_ORDER;
	import static org.springframework.cloud.netflix.zuul.filters.support.FilterConstants.PRE_TYPE;
	import static org.springframework.cloud.netflix.zuul.filters.support.FilterConstants.PROXY_KEY;

	/**
	* Adds an API key in the form of a request header to proxied requests.

jkuipers / MdcPropagatingHystrixConcurrencyStrategy.java

Created December 7, 2018 22:24

	import com.netflix.hystrix.HystrixThreadPoolKey;
	import com.netflix.hystrix.HystrixThreadPoolProperties;
	import com.netflix.hystrix.strategy.HystrixPlugins;
	import com.netflix.hystrix.strategy.concurrency.HystrixConcurrencyStrategy;
	import com.netflix.hystrix.strategy.concurrency.HystrixRequestVariable;
	import com.netflix.hystrix.strategy.concurrency.HystrixRequestVariableLifecycle;
	import com.netflix.hystrix.strategy.eventnotifier.HystrixEventNotifier;
	import com.netflix.hystrix.strategy.executionhook.HystrixCommandExecutionHook;
	import com.netflix.hystrix.strategy.metrics.HystrixMetricsPublisher;
	import com.netflix.hystrix.strategy.properties.HystrixPropertiesStrategy;

jkuipers / keybase.md

Created September 11, 2019 05:46

Keybase proof

I hereby claim:

I am jkuipers on github.
I am jkuipers (https://keybase.io/jkuipers) on keybase.
I have a public key ASCj78lyxPW8_W1t735luDbfcfDboljNT1nxLwkDZvK7rQo

To claim this, I am signing this object:

jkuipers / HttpConnectionPoolHealthIndicator.java

Last active June 16, 2020 17:43

Ensures unhealthy status in case a PoolingHttpClientConnectionManager is shut down, e.g. as result of OOM

	import org.apache.http.impl.conn.PoolingHttpClientConnectionManager;
	import org.springframework.boot.actuate.health.Health;
	import org.springframework.boot.actuate.health.HealthIndicator;
	import org.springframework.boot.actuate.health.Status;
	import org.springframework.util.ReflectionUtils;

	import java.lang.reflect.Field;
	import java.util.LinkedHashMap;
	import java.util.Map;
	import java.util.concurrent.atomic.AtomicBoolean;

jkuipers / spring-boot-snippet.gradle

Created June 23, 2020 21:18

Sample of how to configure Spring Boot's layered jar support for multi-module build that includes your own libs

	subprojects { subproject ->
	// ...

	plugins.withId('org.springframework.boot') {
	springBoot {
	bootJar {
	layered {
	// application follows Boot's defaults
	application {
	intoLayer("spring-boot-loader") {

jkuipers / MDCPropagatingTaskDecorator.java

Created January 5, 2022 08:25

Spring TaskDecorator that propagates an SLF4J MDC to the runner's thread. Accounts for the possibility that the runner's thread is actually the same as the caller's thread by restoring the old MDC context, if existing.

	import org.slf4j.MDC;
	import org.springframework.core.task.TaskDecorator;

	import java.util.Map;

	public class MDCPropagatingTaskDecorator implements TaskDecorator {

	@Override
	public Runnable decorate(Runnable runnable) {
	Map<String, String> callerContext = MDC.getCopyOfContextMap();

jkuipers / OpenJ9MemoryMetrics.java

Created January 14, 2022 14:26

Micrometer.io heap statistics for OpenJ9 VMs


	import io.micrometer.core.instrument.Gauge;
	import io.micrometer.core.instrument.MeterRegistry;
	import io.micrometer.core.instrument.binder.BaseUnits;
	import io.micrometer.core.instrument.binder.MeterBinder;
	import org.slf4j.Logger;
	import org.slf4j.LoggerFactory;
	import org.springframework.util.ReflectionUtils;

	import java.lang.reflect.Method;

jkuipers / TomcatAutoConfiguration.java

Created January 14, 2022 14:32

Spring Boot (auto-)configuration class that defines an additional Tomcat Connector for health checks

	import org.apache.catalina.connector.Connector;
	import org.apache.coyote.AbstractProtocol;
	import org.springframework.boot.context.properties.ConfigurationProperties;
	import org.springframework.boot.context.properties.EnableConfigurationProperties;
	import org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory;
	import org.springframework.boot.web.server.WebServerFactoryCustomizer;
	import org.springframework.context.annotation.Bean;
	import org.springframework.context.annotation.Configuration;
	import org.springframework.context.annotation.Profile;

Joris Kuipers jkuipers

Keybase proof