io.micronaut.scheduling.executor.DefaultExecutorSelector Maven / Gradle / Ivy
/*
* 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
*
* 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.micronaut.scheduling.executor;
import io.micronaut.context.BeanLocator;
import io.micronaut.context.exceptions.NoSuchBeanException;
import io.micronaut.core.annotation.NonBlocking;
import io.micronaut.core.async.publisher.Publishers;
import io.micronaut.core.type.Argument;
import io.micronaut.http.HttpResponse;
import io.micronaut.inject.MethodReference;
import io.micronaut.inject.qualifiers.Qualifiers;
import io.micronaut.scheduling.TaskExecutors;
import io.micronaut.scheduling.annotation.ExecuteOn;
import io.micronaut.scheduling.exceptions.SchedulerConfigurationException;
import javax.inject.Singleton;
import java.util.Optional;
import java.util.concurrent.CompletionStage;
import java.util.concurrent.ExecutorService;
/**
* Default implementation of the {@link ExecutorSelector} interface that regards methods that return reactive types as non-blocking.
*
* @author Graeme Rocher
* @since 1.0
*/
@Singleton
public class DefaultExecutorSelector implements ExecutorSelector {
private final BeanLocator beanLocator;
/**
* Default constructor.
* @param beanLocator The bean locator
*/
protected DefaultExecutorSelector(BeanLocator beanLocator) {
this.beanLocator = beanLocator;
}
@Override
public Optional select(MethodReference method, ThreadSelection threadSelection) {
final String name = method.stringValue(ExecuteOn.class).orElse(null);
if (name != null) {
final ExecutorService executorService;
try {
executorService = beanLocator.getBean(ExecutorService.class, Qualifiers.byName(name));
return Optional.of(executorService);
} catch (NoSuchBeanException e) {
throw new SchedulerConfigurationException(
method,
"No executor configured for name: " + name
);
}
} else if (threadSelection == ThreadSelection.AUTO) {
if (method.hasStereotype(NonBlocking.class)) {
return Optional.empty();
} else {
Class returnType = method.getReturnType().getType();
if (isNonBlocking(returnType)) {
return Optional.empty();
}
if (HttpResponse.class.isAssignableFrom(returnType)) {
Optional> generic = method.getReturnType().getFirstTypeVariable();
if (generic.isPresent()) {
Class argumentType = generic.get().getType();
if (isNonBlocking(argumentType)) {
return Optional.empty();
}
}
}
return beanLocator.findBean(ExecutorService.class, Qualifiers.byName(TaskExecutors.IO));
}
}
return Optional.empty();
}
private boolean isNonBlocking(Class type) {
return Publishers.isConvertibleToPublisher(type) || CompletionStage.class.isAssignableFrom(type);
}
}