| /** |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * <p/> |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * <p/> |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.apache.geronimo.microprofile.impl.health.cdi; |
| |
| import static java.util.stream.Collectors.toList; |
| |
| import java.lang.annotation.Annotation; |
| import java.util.ArrayList; |
| import java.util.Collection; |
| import java.util.List; |
| import java.util.Set; |
| import java.util.stream.Stream; |
| |
| import javax.enterprise.context.spi.CreationalContext; |
| import javax.enterprise.event.Observes; |
| import javax.enterprise.inject.spi.AfterDeploymentValidation; |
| import javax.enterprise.inject.spi.Bean; |
| import javax.enterprise.inject.spi.BeanManager; |
| import javax.enterprise.inject.spi.BeforeShutdown; |
| import javax.enterprise.inject.spi.Extension; |
| import javax.enterprise.inject.spi.ProcessBean; |
| import javax.enterprise.util.AnnotationLiteral; |
| import org.apache.geronimo.microprofile.common.registry.HealthChecksRegistry; |
| import org.eclipse.microprofile.health.Health; |
| import org.eclipse.microprofile.health.HealthCheck; |
| import org.eclipse.microprofile.health.Liveness; |
| import org.eclipse.microprofile.health.Readiness; |
| |
| public class GeronimoHealthExtension implements Extension, HealthChecksRegistry { |
| private final Collection<Bean<?>> beans = new ArrayList<>(); |
| private final Collection<Bean<?>> livenessBeans = new ArrayList<>(); |
| private final Collection<Bean<?>> readinessBeans = new ArrayList<>(); |
| private final Collection<CreationalContext<?>> contexts = new ArrayList<>(); |
| private List<HealthCheck> checks; |
| private List<HealthCheck> liveness; |
| private List<HealthCheck> readiness; |
| private boolean started = false; |
| |
| private static class LivenessLiteral extends AnnotationLiteral<Liveness> { |
| private static final Annotation INSTANCE = new LivenessLiteral(); |
| } |
| |
| private static class ReadinessLiteral extends AnnotationLiteral<Readiness> { |
| private static final Annotation INSTANCE = new ReadinessLiteral(); |
| } |
| |
| void findChecks(@Observes final ProcessBean<?> bean) { |
| if (!bean.getBean().getTypes().contains(HealthCheck.class)) { |
| return; |
| } |
| // deprecated - use @Liveness or @Readiness |
| if (bean.getAnnotated().isAnnotationPresent(Health.class)) { |
| beans.add(bean.getBean()); |
| } |
| if (bean.getBean().getQualifiers().contains(LivenessLiteral.INSTANCE)) { |
| livenessBeans.add(bean.getBean()); |
| } |
| if (bean.getBean().getQualifiers().contains(ReadinessLiteral.INSTANCE)) { |
| readinessBeans.add(bean.getBean()); |
| } |
| } |
| |
| void start(@Observes final AfterDeploymentValidation afterDeploymentValidation, final BeanManager beanManager) { |
| liveness = livenessBeans.stream() |
| .map(it -> lookup(it, beanManager)) |
| .collect(toList()); |
| |
| readiness = readinessBeans.stream() |
| .map(it -> lookup(it, beanManager)) |
| .collect(toList()); |
| |
| // per spec, checks has everything including liveness and readiness |
| checks = Stream.concat(Stream.concat( |
| beans.stream().map(it -> lookup(it, beanManager)), |
| liveness.stream()), |
| readiness.stream()) |
| .collect(toList()); |
| |
| started = true; |
| } |
| |
| void stop(@Observes final BeforeShutdown beforeShutdown) { |
| final IllegalStateException ise = new IllegalStateException("Something went wrong releasing health checks"); |
| contexts.forEach(c -> { |
| try { |
| c.release(); |
| } catch (final RuntimeException re) { |
| ise.addSuppressed(re); |
| } |
| }); |
| final Throwable[] suppressed = ise.getSuppressed(); |
| if (suppressed.length == 1) { |
| throw RuntimeException.class.cast(suppressed[0]); |
| } else if (suppressed.length > 1) { |
| throw ise; |
| } |
| } |
| |
| @Override |
| public List<HealthCheck> getChecks() { |
| return checks; |
| } |
| |
| @Override |
| public Collection<HealthCheck> getReadiness() { |
| return readiness; |
| } |
| |
| @Override |
| public Collection<HealthCheck> getLiveness() { |
| return liveness; |
| } |
| |
| @Override |
| public boolean isReady() { |
| return started; |
| } |
| |
| private HealthCheck lookup(final Bean<?> bean, final BeanManager manager) { |
| // if this is not an instance of HealthCheck, then it's a producer (not sure it's enough) |
| final Class<?> type = bean.getBeanClass() == null || !HealthCheck.class.isAssignableFrom(bean.getBeanClass()) |
| ? HealthCheck.class |
| : bean.getBeanClass(); |
| final Set<Annotation> qualifiers = bean.getQualifiers(); |
| final Set<Bean<?>> beans = manager.getBeans(type, qualifiers.toArray(new Annotation[qualifiers.size()])); |
| final Bean<?> resolvedBean = manager.resolve(beans); |
| final CreationalContext<Object> creationalContext = manager.createCreationalContext(null); |
| if (!manager.isNormalScope(resolvedBean.getScope())) { |
| contexts.add(creationalContext); |
| } |
| return HealthCheck.class.cast(manager.getReference(resolvedBean, HealthCheck.class, creationalContext)); |
| } |
| } |