com.amazonaws.services.simpleworkflow.flow.pojo.POJOActivityImplementation Maven / Gradle / Ivy

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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;
    }
}