org.diqube.thrift.base.services.DiqubeThriftServiceInfoManager.java Source code

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Here is the source code for org.diqube.thrift.base.services.DiqubeThriftServiceInfoManager.java

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/**
 * diqube: Distributed Query Base.
 *
 * Copyright (C) 2015 Bastian Gloeckle
 *
 * This file is part of diqube.
 *
 * diqube is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.diqube.thrift.base.services;

import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

import javax.annotation.PostConstruct;

import org.apache.thrift.TServiceClient;
import org.diqube.context.AutoInstatiate;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.google.common.collect.ImmutableSet;
import com.google.common.reflect.ClassPath;
import com.google.common.reflect.ClassPath.ClassInfo;

/**
 * Contains informations about services provided by the diqube Thrift interface.
 *
 * @author Bastian Gloeckle
 */
@AutoInstatiate
public class DiqubeThriftServiceInfoManager {
    private static final Logger logger = LoggerFactory.getLogger(DiqubeThriftServiceInfoManager.class);

    private static final String BASE_PKG = "org.diqube.remote";

    private Map<Class<?>, DiqubeThriftServiceInfo<?>> annotationByServiceInterface;

    @PostConstruct
    public void initialize() {
        annotationByServiceInterface = new HashMap<>();

        ImmutableSet<ClassInfo> classInfos;
        try {
            classInfos = ClassPath.from(DiqubeThriftServiceInfoManager.class.getClassLoader())
                    .getTopLevelClassesRecursive(BASE_PKG);
        } catch (IOException e) {
            throw new RuntimeException("Could not parse ClassPath.");
        }

        for (ClassInfo classInfo : classInfos) {
            Class<?> clazz = classInfo.load();

            DiqubeThriftService annotation = clazz.getAnnotation(DiqubeThriftService.class);
            if (annotation != null)
                annotationByServiceInterface.put(annotation.serviceInterface(),
                        new DiqubeThriftServiceInfo<>(annotation));
        }
        logger.info("Found {} diqube services in {} scanned classes.", annotationByServiceInterface.size(),
                classInfos.size());
    }

    @SuppressWarnings("unchecked")
    public <T> DiqubeThriftServiceInfo<T> getServiceInfo(Class<T> serviceInterfaceClass) {
        return (DiqubeThriftServiceInfo<T>) annotationByServiceInterface.get(serviceInterfaceClass);
    }

    public static class DiqubeThriftServiceInfo<T> {
        private Class<T> serviceInterface;
        private Class<? extends TServiceClient> clientClass;
        private String serviceName;
        private boolean integrityChecked;

        /* package */ @SuppressWarnings("unchecked")
        DiqubeThriftServiceInfo(DiqubeThriftService annotation) {
            serviceInterface = (Class<T>) annotation.serviceInterface();
            clientClass = annotation.clientClass();
            serviceName = annotation.serviceName();
            integrityChecked = annotation.integrityChecked();
        }

        public Class<T> getServiceInterface() {
            return serviceInterface;
        }

        public Class<? extends TServiceClient> getClientClass() {
            return clientClass;
        }

        public String getServiceName() {
            return serviceName;
        }

        public boolean isIntegrityChecked() {
            return integrityChecked;
        }
    }
}