com.amazonaws.services.simpleworkflow.flow.worker.ActivityDecisionStateMachine Maven / Gradle / Ivy

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The Amazon Web Services SDK for Java provides Java APIs for building software on AWS' cost-effective, scalable, and reliable infrastructure products. The AWS Java SDK allows developers to code against APIs for all of Amazon's infrastructure web services (Amazon S3, Amazon EC2, Amazon SQS, Amazon Relational Database Service, Amazon AutoScaling, etc).

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/*
 * Copyright 2012-2014 Amazon.com, Inc. or its affiliates. All Rights Reserved.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"). You may not
 * use this file except in compliance with the License. A copy of the License is
 * located at
 * 
 * http://aws.amazon.com/apache2.0
 * 
 * or in the "license" file accompanying this file. This file 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 com.amazonaws.services.simpleworkflow.flow.worker;

import com.amazonaws.services.simpleworkflow.model.Decision;
import com.amazonaws.services.simpleworkflow.model.DecisionType;
import com.amazonaws.services.simpleworkflow.model.HistoryEvent;
import com.amazonaws.services.simpleworkflow.model.RequestCancelActivityTaskDecisionAttributes;
import com.amazonaws.services.simpleworkflow.model.ScheduleActivityTaskDecisionAttributes;

class ActivityDecisionStateMachine extends DecisionStateMachineBase {

    private ScheduleActivityTaskDecisionAttributes scheduleAttributes;

    public ActivityDecisionStateMachine(DecisionId id, ScheduleActivityTaskDecisionAttributes scheduleAttributes) {
        super(id);
        this.scheduleAttributes = scheduleAttributes;
    }

    /**
     * Used for unit testing
     */
    ActivityDecisionStateMachine(DecisionId id, ScheduleActivityTaskDecisionAttributes scheduleAttributes, DecisionState state) {
        super(id, state);
        this.scheduleAttributes = scheduleAttributes;
    }

    @Override
    public Decision getDecision() {
        switch (state) {
        case CREATED:
            return createScheduleActivityTaskDecision();
        case CANCELED_AFTER_INITIATED:
            return createRequestCancelActivityTaskDecision();
        default:
            return null;
        }
    }

    @Override
    public void handleDecisionTaskStartedEvent() {
        switch (state) {
        case CANCELED_AFTER_INITIATED:
            stateHistory.add("handleDecisionTaskStartedEvent");
            state = DecisionState.CANCELLATION_DECISION_SENT;
            stateHistory.add(state.toString());
            break;
        default:
            super.handleDecisionTaskStartedEvent();
        }
    }

    @Override
    public void handleCancellationFailureEvent(HistoryEvent event) {
        switch (state) {
        case CANCELLATION_DECISION_SENT:
            stateHistory.add("handleCancellationFailureEvent");
            state = DecisionState.INITIATED;
            stateHistory.add(state.toString());
            break;
        default:
            super.handleCancellationFailureEvent(event);
        }
    }

    private Decision createRequestCancelActivityTaskDecision() {
        RequestCancelActivityTaskDecisionAttributes tryCancel = new RequestCancelActivityTaskDecisionAttributes();
        tryCancel.setActivityId(scheduleAttributes.getActivityId());
        Decision decision = new Decision();
        decision.setRequestCancelActivityTaskDecisionAttributes(tryCancel);
        decision.setDecisionType(DecisionType.RequestCancelActivityTask.toString());
        return decision;
    }

    private Decision createScheduleActivityTaskDecision() {
        Decision decision = new Decision();
        decision.setScheduleActivityTaskDecisionAttributes(scheduleAttributes);
        decision.setDecisionType(DecisionType.ScheduleActivityTask.toString());
        return decision;
    }

}