org.web4thejob.util.converter.JobletScanner.java Source code

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Here is the source code for org.web4thejob.util.converter.JobletScanner.java

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/*
 * Copyright (c) 2012-2014 Veniamin Isaias.
 *
 * This file is part of web4thejob.
 *
 * Web4thejob is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or any later version.
 *
 * Web4thejob 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with web4thejob.  If not, see <http://www.gnu.org/licenses/>.
 */

package org.web4thejob.util.converter;

import org.apache.log4j.Logger;
import org.springframework.beans.factory.config.BeanDefinition;
import org.springframework.context.annotation.ClassPathScanningCandidateComponentProvider;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
import org.springframework.core.type.filter.AssignableTypeFilter;
import org.springframework.util.ClassUtils;
import org.web4thejob.module.Joblet;
import org.web4thejob.module.SystemJoblet;

import java.util.Collection;
import java.util.HashSet;
import java.util.Set;

/**
 * @author Veniamin Isaias
 * @since 3.5.0
 */
public class JobletScanner extends ClassPathScanningCandidateComponentProvider {
    private static final Logger LOG = Logger.getLogger(JobletScanner.class);

    public JobletScanner() {
        super(false);
        addIncludeFilter(new AssignableTypeFilter(Joblet.class));
    }

    @SuppressWarnings("unchecked")
    public final Collection getComponentClasses(String basePackage) {
        boolean systemJobletFound = false;

        basePackage = basePackage == null ? "" : basePackage;
        Set<Class<?>> classes = new HashSet<Class<?>>();
        for (BeanDefinition candidate : findCandidateComponents(basePackage)) {
            try {
                Class cls = ClassUtils.resolveClassName(candidate.getBeanClassName(),
                        ClassUtils.getDefaultClassLoader());

                if (SystemJoblet.class.isAssignableFrom(cls)) {
                    systemJobletFound = true;
                }

                classes.add(cls);
            } catch (Throwable ex) {
                ex.printStackTrace();
            }
        }

        if (!systemJobletFound) {
            final ClassLoader classLoader = SystemJoblet.class.getClassLoader();
            setResourceLoader(new PathMatchingResourcePatternResolver(classLoader));
            resetFilters(false);
            addIncludeFilter(new AssignableTypeFilter(SystemJoblet.class));

            for (BeanDefinition candidate : findCandidateComponents("org.web4thejob")) {
                try {
                    Class cls = ClassUtils.resolveClassName(candidate.getBeanClassName(),
                            ClassUtils.getDefaultClassLoader());

                    if (SystemJoblet.class.isAssignableFrom(cls)) {
                        systemJobletFound = true;
                    }

                    classes.add(cls);
                } catch (Throwable ex) {
                    ex.printStackTrace();
                }
            }
        }

        if (!systemJobletFound) {
            LOG.error("Unable to scan System Joblet!");

        }

        return classes;
    }
}