tech.aroma.application.service.reactions.actions.ActionRunnerSynchronous.java Source code

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Here is the source code for tech.aroma.application.service.reactions.actions.ActionRunnerSynchronous.java

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/*
 * Copyright 2016 RedRoma, Inc.
 *
 * 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 tech.aroma.application.service.reactions.actions;

import com.google.common.collect.Queues;
import java.util.List;
import java.util.Queue;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import sir.wellington.alchemy.collections.lists.Lists;
import tech.aroma.thrift.Message;
import tech.sirwellington.alchemy.annotations.access.Internal;
import tech.sirwellington.alchemy.annotations.designs.patterns.StrategyPattern;

import static tech.sirwellington.alchemy.annotations.designs.patterns.StrategyPattern.Role.CONCRETE_BEHAVIOR;

/**
 * This is a concrete implementation of the {@link ActionRunner} interface
 * that executes {@linkplain Action Actions} in a FI-FO manner.
 * 
 * @author SirWellington
 */
@Internal
@StrategyPattern(role = CONCRETE_BEHAVIOR)
final class ActionRunnerSynchronous implements ActionRunner {

    private final static Logger LOG = LoggerFactory.getLogger(ActionRunnerSynchronous.class);

    @Override
    public int runThroughActions(Message message, List<Action> actions) {

        int totalRuns = 0;
        Queue<Action> queue = Queues.newLinkedBlockingDeque(actions);

        while (!queue.isEmpty()) {
            Action nextAction = queue.poll();

            if (nextAction == null) {
                break;
            }
            ++totalRuns;

            List<Action> additionalActions = runAction(message, nextAction);
            queue.addAll(additionalActions);

            LOG.debug("Pass {} complete with {} additional actions to run through.", totalRuns,
                    additionalActions.size());
        }

        return totalRuns;
    }

    private List<Action> runAction(Message message, Action action) {
        try {
            return action.actOnMessage(message);
        } catch (Exception ex) {
            LOG.error("Failed to run Action {} on Message {}", action, message, ex);
            return Lists.emptyList();
        }
    }
}