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Resilience4j is a lightweight, easy-to-use fault tolerance library designed for Java8 and functional programming
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/*
 * Copyright 2020 Michael Pollind
 *
 * 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.
 */
package io.github.resilience4j.micronaut.bulkhead;

import io.github.resilience4j.bulkhead.ThreadPoolBulkhead;
import io.github.resilience4j.bulkhead.ThreadPoolBulkheadConfig;
import io.github.resilience4j.bulkhead.ThreadPoolBulkheadRegistry;
import io.github.resilience4j.bulkhead.event.BulkheadEvent;
import io.github.resilience4j.common.CompositeCustomizer;
import io.github.resilience4j.common.bulkhead.configuration.CommonThreadPoolBulkheadConfigurationProperties;
import io.github.resilience4j.common.bulkhead.configuration.ThreadPoolBulkheadConfigCustomizer;
import io.github.resilience4j.consumer.DefaultEventConsumerRegistry;
import io.github.resilience4j.consumer.EventConsumerRegistry;
import io.github.resilience4j.core.registry.CompositeRegistryEventConsumer;
import io.github.resilience4j.core.registry.RegistryEventConsumer;
import io.micronaut.context.annotation.Bean;
import io.micronaut.context.annotation.Factory;
import io.micronaut.context.annotation.Primary;
import io.micronaut.context.annotation.Requires;
import io.micronaut.core.util.StringUtils;
import jakarta.inject.Singleton;

import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.Optional;
import java.util.stream.Collectors;

import static java.util.Optional.ofNullable;

@Factory
@Requires(property = "resilience4j.thread-pool-bulkhead.enabled", value = StringUtils.TRUE, defaultValue = StringUtils.FALSE)
public class ThreadPoolBulkheadFactory {
    @Bean
    @ThreadPoolBulkheadQualifier
    public CompositeCustomizer compositeThreadPoolBulkheadCustomizer(
        List customizers) {
        return new CompositeCustomizer<>(customizers);
    }

    @Singleton
    @Requires(beans = CommonThreadPoolBulkheadConfigurationProperties.class)
    public ThreadPoolBulkheadRegistry threadPoolBulkheadRegistry(
        CommonThreadPoolBulkheadConfigurationProperties bulkheadConfigurationProperties,
        @ThreadPoolBulkheadQualifier EventConsumerRegistry bulkheadEventConsumerRegistry,
        @ThreadPoolBulkheadQualifier RegistryEventConsumer threadPoolBulkheadRegistryEventConsumer,
        @ThreadPoolBulkheadQualifier CompositeCustomizer compositeThreadPoolBulkheadCustomizer) {

        ThreadPoolBulkheadRegistry bulkheadRegistry = createBulkheadRegistry(
            bulkheadConfigurationProperties, threadPoolBulkheadRegistryEventConsumer,
            compositeThreadPoolBulkheadCustomizer);
        registerEventConsumer(bulkheadRegistry, bulkheadEventConsumerRegistry,
            bulkheadConfigurationProperties);
        bulkheadConfigurationProperties.getBackends().forEach((name, properties) -> bulkheadRegistry
            .bulkhead(name, bulkheadConfigurationProperties
                .createThreadPoolBulkheadConfig(name, compositeThreadPoolBulkheadCustomizer)));
        return bulkheadRegistry;
    }

    @Bean
    @Primary
    @ThreadPoolBulkheadQualifier
    public RegistryEventConsumer threadPoolBulkheadRegistryEventConsumer(
        Optional>> optionalRegistryEventConsumers) {
        return new CompositeRegistryEventConsumer<>(
            optionalRegistryEventConsumers.orElseGet(ArrayList::new));
    }

    @Bean
    @ThreadPoolBulkheadQualifier
    public EventConsumerRegistry threadPoolBulkheadEventsConsumerRegistry() {
        return new DefaultEventConsumerRegistry<>();
    }

    /**
     * Initializes a bulkhead registry.
     *
     * @param threadPoolBulkheadConfigurationProperties The bulkhead configuration properties.
     * @param compositeThreadPoolBulkheadCustomizer     the delegate of customizers
     * @return a ThreadPoolBulkheadRegistry
     */
    private ThreadPoolBulkheadRegistry createBulkheadRegistry(
        CommonThreadPoolBulkheadConfigurationProperties threadPoolBulkheadConfigurationProperties,
        RegistryEventConsumer threadPoolBulkheadRegistryEventConsumer,
        CompositeCustomizer compositeThreadPoolBulkheadCustomizer) {
        Map configs = threadPoolBulkheadConfigurationProperties
            .getConfigs()
            .entrySet()
            .stream()
            .collect(Collectors.toMap(Map.Entry::getKey,
                entry -> threadPoolBulkheadConfigurationProperties
                    .createThreadPoolBulkheadConfig(entry.getValue(),
                        compositeThreadPoolBulkheadCustomizer, entry.getKey())));
        return ThreadPoolBulkheadRegistry.of(configs, threadPoolBulkheadRegistryEventConsumer, threadPoolBulkheadConfigurationProperties.getTags());
    }

    /**
     * Registers the post creation consumer function that registers the consumer events to the
     * bulkheads.
     *
     * @param bulkheadRegistry      The BulkHead registry.
     * @param eventConsumerRegistry The event consumer registry.
     */
    private void registerEventConsumer(ThreadPoolBulkheadRegistry bulkheadRegistry,
                                       EventConsumerRegistry eventConsumerRegistry,
                                       CommonThreadPoolBulkheadConfigurationProperties bulkheadConfigurationProperties) {
        bulkheadRegistry.getEventPublisher().onEntryAdded(
            event -> registerEventConsumer(eventConsumerRegistry, event.getAddedEntry(),
                bulkheadConfigurationProperties));
    }

    private void registerEventConsumer(EventConsumerRegistry eventConsumerRegistry,
                                       ThreadPoolBulkhead bulkHead,
                                       CommonThreadPoolBulkheadConfigurationProperties bulkheadConfigurationProperties) {
        int eventConsumerBufferSize = ofNullable(bulkheadConfigurationProperties.getBackendProperties(bulkHead.getName()))
            .map(
                CommonThreadPoolBulkheadConfigurationProperties.InstanceProperties::getEventConsumerBufferSize)
            .orElse(100);
        bulkHead.getEventPublisher().onEvent(eventConsumerRegistry.createEventConsumer(
            String.join("-", ThreadPoolBulkhead.class.getSimpleName(), bulkHead.getName()),
            eventConsumerBufferSize));
    }
}