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microprofile-health-128 org.eclipse.microprofile.health.HealthCheckRe…
…sponse leaks fixes eclipse#128 with multiple providers support addition Signed-off-by: Antoine Sabot-Durand <[email protected]>
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129 changes: 129 additions & 0 deletions
129
api/src/main/java/org/eclipse/microprofile/health/HealthCheckResponseProviderResolver.java
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| @@ -0,0 +1,129 @@ | ||
| /* | ||
| * Copyright (c) 2020 Contributors to the Eclipse Foundation | ||
| * | ||
| * See the NOTICES file(s) distributed with this work for additional | ||
| * information regarding copyright ownership. | ||
| * | ||
| * Licensed 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 | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * 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. | ||
| * | ||
| * SPDX-License-Identifier: Apache-2.0 | ||
| * | ||
| */ | ||
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| package org.eclipse.microprofile.health; | ||
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| import java.util.Collections; | ||
| import java.util.ServiceConfigurationError; | ||
| import java.util.ServiceLoader; | ||
| import java.util.Set; | ||
| import java.util.HashSet; | ||
| import java.util.function.Predicate; | ||
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| import org.eclipse.microprofile.health.spi.HealthCheckResponseProvider; | ||
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| /** | ||
| * This class an helper to retrieve the Microprofile HealthCheck implementation | ||
| * by using Java {@link ServiceLoader} api. | ||
| * It allows the usage of multiple implementations at the same time. | ||
| * | ||
| * @author Antoine Sabot-Durand | ||
| * @since 3.0 | ||
| */ | ||
| public class HealthCheckResponseProviderResolver { | ||
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| private static final Object LOCK = new Object(); | ||
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| private static volatile HealthCheckResponseProvider provider = null; | ||
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| private static volatile Set<HealthCheckResponseProvider> discoveredProviders = null; | ||
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| private static volatile Predicate<HealthCheckResponseProvider> providerPredicate = p -> true; | ||
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| protected HealthCheckResponseProviderResolver() { | ||
| } | ||
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| /** | ||
| * @return the selected {@link HealthCheckResponseProvider} in cache. If not available it tries to resolve it first | ||
| */ | ||
| public static HealthCheckResponseProvider getProvider() { | ||
| if (provider == null) { | ||
| if (discoveredProviders == null) { | ||
| synchronized (LOCK) { | ||
| if (discoveredProviders == null) { | ||
| findAllProviders(); | ||
| } | ||
| } | ||
| } | ||
| provider = discoveredProviders.stream() | ||
| .filter(providerPredicate) | ||
| .findFirst().orElseThrow(() -> new IllegalStateException("No HealthCheckResponseProvider implementation found!")); | ||
| } | ||
| return provider; | ||
| } | ||
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| /** | ||
| * | ||
| * Used to manually set the {@link HealthCheckResponseProvider}. | ||
| * Also used by OSGi environment where the service loader pattern is not supported. | ||
| * | ||
| * @param provider the provider instance to use. | ||
| */ | ||
| public static void setProvider(HealthCheckResponseProvider provider) { | ||
| HealthCheckResponseProviderResolver.provider = provider; | ||
| } | ||
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| /** | ||
| * | ||
| * Other way than {@link #setProvider} to set the {@link HealthCheckResponseProvider} | ||
| * | ||
| * @param providerPredicate a predicate to choose the matching provider | ||
| */ | ||
| public static void setProviderPredicate(Predicate<HealthCheckResponseProvider> providerPredicate) { | ||
| HealthCheckResponseProviderResolver.providerPredicate = providerPredicate; | ||
| setProvider(null); | ||
| } | ||
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| private static void findAllProviders() { | ||
| ServiceLoader<HealthCheckResponseProvider> providerLoader; | ||
| Set<HealthCheckResponseProvider> providers = new HashSet<>(); | ||
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| Class<HealthCheckResponseProvider> clazz = HealthCheckResponseProvider.class; | ||
| ClassLoader cl = SecurityActions.getContextClassLoader(); | ||
| if (cl == null) { | ||
| cl = clazz.getClassLoader(); | ||
| } | ||
| providerLoader = SecurityActions.loadService(HealthCheckResponseProvider.class, cl); | ||
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| if (!providerLoader.iterator().hasNext()) { | ||
| throw new IllegalStateException("Unable to locate HealthCheckResponseProvider"); | ||
| } | ||
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| try { | ||
| providerLoader.forEach(providers::add); | ||
| } | ||
| catch (ServiceConfigurationError e) { | ||
| throw new IllegalStateException(e); | ||
| } | ||
| discoveredProviders = Collections.unmodifiableSet(providers); | ||
| } | ||
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| protected static void reset() { | ||
| provider = null; | ||
| discoveredProviders =null; | ||
| providerPredicate = p -> true; | ||
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| } | ||
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| } |
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