io.micronaut.context.DefaultCustomScopeRegistry Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of micronaut-inject Show documentation
Natively Cloud Native
There is a newer version: 4.7.5
/*
 * Copyright 2017-2020 original authors
 *
 * 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
 *
 * https://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.micronaut.context;

import io.micronaut.context.annotation.InjectScope;
import io.micronaut.context.scope.BeanCreationContext;
import io.micronaut.context.scope.CreatedBean;
import io.micronaut.context.scope.CustomScope;
import io.micronaut.context.scope.CustomScopeRegistry;
import io.micronaut.core.annotation.AnnotationMetadata;
import io.micronaut.core.annotation.AnnotationUtil;
import io.micronaut.core.annotation.NonNull;
import io.micronaut.core.type.Argument;
import io.micronaut.core.util.CollectionUtils;
import io.micronaut.inject.BeanIdentifier;
import io.micronaut.inject.BeanType;
import io.micronaut.inject.qualifiers.Qualifiers;

import java.lang.annotation.Annotation;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.Optional;
import java.util.concurrent.ConcurrentHashMap;

/**
 * Default implementation of the {@link CustomScopeRegistry} interface.
 *
 * @author Graeme Rocher
 * @since 1.0
 */
public class DefaultCustomScopeRegistry implements CustomScopeRegistry {
    /**
     * Constant to refer to inject scope.
     */
    static final CustomScope INJECT_SCOPE = new InjectScopeImpl();
    private final BeanLocator beanLocator;
    private final Map>> scopes = new ConcurrentHashMap<>(2);

    /**
     * @param beanLocator The bean locator
     */
    protected DefaultCustomScopeRegistry(BeanLocator beanLocator) {
        this.beanLocator = beanLocator;
        this.scopes.put(InjectScope.class.getName(), Optional.of(INJECT_SCOPE));
    }

    @Override
    public  Optional> findBeanRegistration(T bean) {
        for (Optional> value : scopes.values()) {
            if (value.isPresent()) {
                final CustomScope customScope = value.get();
                final Optional> beanRegistration = customScope.findBeanRegistration(bean);
                if (beanRegistration.isPresent()) {
                    return beanRegistration;
                }
            }
        }
        return Optional.empty();
    }

    @Override
    public Optional> findDeclaredScope(@NonNull Argument argument) {
        final AnnotationMetadata annotationMetadata = argument.getAnnotationMetadata();
        if (annotationMetadata.hasStereotype(AnnotationUtil.SCOPE)) {
            return annotationMetadata.getAnnotationNameByStereotype(AnnotationUtil.SCOPE).flatMap(this::findScope);
        }
        return Optional.empty();
    }

    @Override
    public Optional> findDeclaredScope(@NonNull BeanType beanType) {
        if (beanType.getAnnotationMetadata().hasStereotype(AnnotationUtil.SCOPE)) {
            final List scopeHierarchy = beanType.getAnnotationMetadata().getAnnotationNamesByStereotype(AnnotationUtil.SCOPE);
            if (CollectionUtils.isNotEmpty(scopeHierarchy)) {
                Optional> registeredScope = Optional.empty();
                for (String scope : scopeHierarchy) {
                    registeredScope = findScope(scope);
                    if (registeredScope.isPresent()) {
                        break;
                    }
                }
                return registeredScope;
            }
        }
        return Optional.empty();
    }

    @SuppressWarnings("unchecked")
    @Override
    public Optional> findScope(Class scopeAnnotation) {
        return scopes.computeIfAbsent(scopeAnnotation.getName(), s -> {
            final Qualifier qualifier = Qualifiers.byTypeArguments(scopeAnnotation);
            return beanLocator.findBean(CustomScope.class, qualifier);
        });
    }

    @SuppressWarnings("unchecked")
    @Override
    public Optional> findScope(String scopeAnnotation) {
        return scopes.computeIfAbsent(scopeAnnotation, type -> {
            final Qualifier qualifier = Qualifiers.byExactTypeArgumentName(scopeAnnotation);
            return beanLocator.findBean(CustomScope.class, qualifier);
        });
    }

    private static final class InjectScopeImpl implements CustomScope, LifeCycle {

        private final List> currentCreatedBeans = new ArrayList<>(2);

        @Override
        public Class annotationType() {
            return InjectScope.class;
        }

        @Override
        public  T getOrCreate(BeanCreationContext creationContext) {
            final CreatedBean createdBean = creationContext.create();
            currentCreatedBeans.add(createdBean);
            return createdBean.bean();
        }

        @Override
        public  Optional remove(BeanIdentifier identifier) {
            return Optional.empty();
        }

        @Override
        public boolean isRunning() {
            return true;
        }

        @Override
        public InjectScopeImpl stop() {
            for (CreatedBean currentCreatedBean : currentCreatedBeans) {
                currentCreatedBean.close();
            }
            currentCreatedBeans.clear();
            return this;
        }
    }
}