com.eucalyptus.simpleworkflow.stateful.PolledNotificationCheckerDiscovery.java Source code

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Here is the source code for com.eucalyptus.simpleworkflow.stateful.PolledNotificationCheckerDiscovery.java

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/*************************************************************************
 * Copyright 2009-2014 Eucalyptus Systems, Inc.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 3 of the License.
 *
 * 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see http://www.gnu.org/licenses/.
 *
 * Please contact Eucalyptus Systems, Inc., 6755 Hollister Ave., Goleta
 * CA 93117, USA or visit http://www.eucalyptus.com/licenses/ if you need
 * additional information or have any questions.
 ************************************************************************/
package com.eucalyptus.simpleworkflow.stateful;

import java.lang.reflect.Modifier;
import java.util.concurrent.CopyOnWriteArrayList;
import org.apache.log4j.Logger;
import com.eucalyptus.bootstrap.ServiceJarDiscovery;
import com.google.common.base.Supplier;
import com.google.common.collect.Iterables;

/**
 *
 */
public class PolledNotificationCheckerDiscovery extends ServiceJarDiscovery {

    private static final Logger logger = Logger.getLogger(PolledNotificationCheckerDiscovery.class);

    private static final CopyOnWriteArrayList<PolledNotificationChecker> checkers = new CopyOnWriteArrayList<>();

    @Override
    public boolean processClass(final Class candidate) throws Exception {
        if (PolledNotificationChecker.class.isAssignableFrom(candidate)
                && !Modifier.isAbstract(candidate.getModifiers()) && !Modifier.isInterface(candidate.getModifiers())
                && !candidate.isLocalClass() && !candidate.isAnonymousClass()) {
            try {
                checkers.add((PolledNotificationChecker) candidate.newInstance());
                logger.debug("Discovered polled notification checker: " + candidate.getName());
            } catch (final Throwable ex) {
                logger.error("Error in discovery for " + candidate.getName(), ex);
            }
            return true;
        } else {
            return false;
        }
    }

    static Supplier<Iterable<PolledNotificationChecker>> supplier() {
        return new Supplier<Iterable<PolledNotificationChecker>>() {
            @Override
            public Iterable<PolledNotificationChecker> get() {
                return Iterables.unmodifiableIterable(checkers);
            }
        };
    }

    @Override
    public Double getPriority() {
        return 0.3d;
    }
}