org.isisaddons.module.scheduler.dom.AbstractIsisJob.java Source code

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Here is the source code for org.isisaddons.module.scheduler.dom.AbstractIsisJob.java

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/*
 *  Copyright 2013 Dan Haywood
 *
 *  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 org.isisaddons.module.scheduler.dom;

import java.util.List;

import org.apache.isis.core.commons.authentication.AuthenticationSession;
import org.apache.isis.core.runtime.authentication.standard.SimpleSession;
import org.apache.isis.core.runtime.system.context.IsisContext;
import org.apache.isis.core.runtime.system.session.IsisSession;
import org.quartz.Job;
import org.quartz.JobExecutionContext;
import org.quartz.JobExecutionException;

import com.google.common.base.Splitter;
import com.google.common.collect.Iterables;

public abstract class AbstractIsisJob implements Job {

    /**
     * Sets up an {@link IsisSession} then delegates to the {@link #doExecute(JobExecutionContext) hook}. 
     */
    public void execute(JobExecutionContext context) throws JobExecutionException {
        final AuthenticationSession authSession = newAuthSession(context);
        try {
            IsisContext.openSession(authSession);
            doExecute(context);
        } finally {
            IsisContext.closeSession();
        }
    }

    AuthenticationSession newAuthSession(JobExecutionContext context) {
        String user = getKey(context, AbstractSchedulerService.USER_KEY);
        String rolesStr = getKey(context, AbstractSchedulerService.ROLES_KEY);
        String[] roles = Iterables.toArray(Splitter.on(",").split(rolesStr), String.class);
        return new SimpleSession(user, roles);
    }

    /**
     * Mandatory hook.
     */
    protected abstract void doExecute(JobExecutionContext context);

    /**
     * Helper method for benefit of subclasses
     */
    protected String getKey(JobExecutionContext context, String key) {
        return context.getMergedJobDataMap().getString(key);
    }

    /**
     * Helper method for benefit of subclasses
     */
    protected <T> T getService(Class<T> cls) {
        List<Object> services = IsisContext.getServices();
        for (Object service : services) {
            if (cls.isAssignableFrom(service.getClass())) {
                return asT(service);
            }
        }
        throw new IllegalArgumentException("No service of type '" + cls.getName() + "' was found");
    }

    @SuppressWarnings("unchecked")
    private static <T> T asT(Object service) {
        return (T) service;
    }

}