com.amazonaws.services.simpleworkflow.flow.pojo.POJOActivityImplementation 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.pojo;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.concurrent.CancellationException;

import com.amazonaws.services.simpleworkflow.flow.ActivityExecutionContext;
import com.amazonaws.services.simpleworkflow.flow.ActivityFailureException;
import com.amazonaws.services.simpleworkflow.flow.DataConverter;
import com.amazonaws.services.simpleworkflow.flow.DataConverterException;
import com.amazonaws.services.simpleworkflow.flow.common.WorkflowExecutionUtils;
import com.amazonaws.services.simpleworkflow.flow.generic.ActivityImplementationBase;
import com.amazonaws.services.simpleworkflow.flow.worker.ActivityTypeExecutionOptions;
import com.amazonaws.services.simpleworkflow.flow.worker.ActivityTypeRegistrationOptions;
import com.amazonaws.services.simpleworkflow.flow.worker.CurrentActivityExecutionContext;

class POJOActivityImplementation extends ActivityImplementationBase {

    private final Method activity;

    private final Object activitiesImplmentationObject;

    private final ActivityTypeExecutionOptions executionOptions;

    private final DataConverter converter;

    private final ActivityTypeRegistrationOptions registrationOptions;

    public POJOActivityImplementation(Object activitiesImplmentationObject, Method activity,
            ActivityTypeRegistrationOptions registrationOptions, ActivityTypeExecutionOptions executionOptions,
            DataConverter converter) {
        this.activitiesImplmentationObject = activitiesImplmentationObject;
        this.activity = activity;
        this.registrationOptions = registrationOptions;
        this.executionOptions = executionOptions;
        this.converter = converter;
    }

    @Override
    protected String execute(String input, ActivityExecutionContext context) 
            throws ActivityFailureException, CancellationException {
        //TODO: Support ability to call activity using old client 
        // after new parameters were added to activity method
        // It requires creation of inputParameters array of the correct size and
        // populating the new parameter values with default values for each type
        Object[] inputParameters = converter.fromData(input, Object[].class);
        CurrentActivityExecutionContext.set(context);
        Object result = null;
        try {
            result = activity.invoke(activitiesImplmentationObject, inputParameters);
        }
        catch (InvocationTargetException invocationException) {
            throwActivityFailureException(invocationException.getTargetException() != null 
                    ? invocationException.getTargetException() : invocationException);
        }
        catch (IllegalArgumentException illegalArgumentException) {
            throwActivityFailureException(illegalArgumentException);
        }
        catch (IllegalAccessException illegalAccessException) {
            throwActivityFailureException(illegalAccessException);
        }
        finally {
            CurrentActivityExecutionContext.unset();
        }
        return converter.toData(result);
    }

    @Override
    public ActivityTypeRegistrationOptions getRegistrationOptions() {
        return registrationOptions;
    }

    @Override
    public ActivityTypeExecutionOptions getExecutionOptions() {
        return executionOptions;
    }
    
    void throwActivityFailureException(Throwable exception) 
            throws ActivityFailureException, CancellationException {
        
        if (exception instanceof CancellationException) {
            throw (CancellationException)exception;
        }
        
        String reason = WorkflowExecutionUtils.truncateReason(exception.getMessage());
        String details = null;
        try {
            details = converter.toData(exception);
        } catch (DataConverterException dataConverterException) {
            if (dataConverterException.getCause() == null) {
                dataConverterException.initCause(exception);
            }
            throw dataConverterException;
        }
        
        throw new ActivityFailureException(reason, details);
    }

    public Method getMethod() {
        return activity;
    }

    public Object getActivitiesImplementation() {
        return activitiesImplmentationObject;
    }
}