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An intelligent way of booting complex applications and services according to their dependencies

There is a newer version: 3.1.0

/*
 * Copyright (C) 2015 SoftIndex LLC.
 *
 * 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.datakernel.worker;

import com.google.inject.*;
import com.google.inject.matcher.AbstractMatcher;
import com.google.inject.spi.BindingScopingVisitor;
import com.google.inject.spi.ProvisionListener;

import java.lang.annotation.Annotation;

import static io.datakernel.util.ReflectionUtils.getAnnotationString;

public final class WorkerPoolModule extends AbstractModule {
	public static boolean isWorkerScope(Binding binding) {
		return binding.acceptScopingVisitor(new BindingScopingVisitor() {
			@Override
			public Boolean visitNoScoping() {
				return false;
			}

			@Override
			public Boolean visitScopeAnnotation(Class visitedAnnotation) {
				return visitedAnnotation == Worker.class;
			}

			@Override
			public Boolean visitScope(Scope visitedScope) {
				return visitedScope.getClass() == WorkerPoolScope.class;
			}

			@Override
			public Boolean visitEagerSingleton() {
				return false;
			}
		});
	}

	@Override
	protected void configure() {
		WorkerPoolScope scope = new WorkerPoolScope();
		WorkerPools workerPools = new WorkerPools();
		Provider injectorProvider = getProvider(Injector.class);
		bindListener(new AbstractMatcher>() {
			@Override
			public boolean matches(Binding binding) {
				return binding.getKey().getTypeLiteral().getRawType() == WorkerPool.class;
			}
		}, new ProvisionListener() {
			@Override
			public  void onProvision(ProvisionInvocation provision) {
				WorkerPool workerPool = (WorkerPool) provision.provision();
				workerPool.setInjector(injectorProvider.get());
				workerPool.setScopeInstance(scope);

				Annotation annotation = provision.getBinding().getKey().getAnnotation();
				if (annotation != null) {
					try {
						workerPool.setAnnotationString("@" + getAnnotationString(annotation));
					} catch (ReflectiveOperationException e) {
						throw new IllegalStateException("Error during generation annotation string for worker pool " + workerPool, e);
					}
				}

				workerPools.addWorkerPool(workerPool);
			}
		});

		bindScope(Worker.class, scope);
		bind(Integer.class).annotatedWith(WorkerId.class).toProvider(scope::getCurrentWorkerId);
		bind(WorkerPools.class).toInstance(workerPools);
	}
}