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• WorkerBase.java

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com.amazonaws.services.simpleworkflow.flow.WorkerBase Maven / Gradle / Ivy

/*
 * 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;

import java.lang.Thread.UncaughtExceptionHandler;

import com.amazonaws.services.simpleworkflow.AmazonSimpleWorkflow;
import com.amazonaws.services.simpleworkflow.flow.annotations.SkipTypeRegistration;

public interface WorkerBase extends SuspendableWorker {

    AmazonSimpleWorkflow getService();

    String getDomain();

    boolean isRegisterDomain();

    /**
     * Should domain be registered on startup. Default is false.
     * When enabled {@link #setDomainRetentionPeriodInDays(Long)} property is
     * required.
     */
    void setRegisterDomain(boolean registerDomain);

    long getDomainRetentionPeriodInDays();

    /**
     * Value of DomainRetentionPeriodInDays parameter passed to
     * {@link AmazonSimpleWorkflow#registerDomain} call. Required when
     * {@link #isRegisterDomain()} is true.
     */
    void setDomainRetentionPeriodInDays(long domainRetentionPeriodInDays);

    /**
     * Task list name that given worker polls for tasks.
     */
    String getTaskListToPoll();

    double getMaximumPollRatePerSecond();

    /**
     * Maximum number of poll request to the task list per second allowed.
     * Default is 0 which means unlimited.
     * 
     * @see #setMaximumPollRateIntervalMilliseconds(int)
     */
    void setMaximumPollRatePerSecond(double maximumPollRatePerSecond);

    int getMaximumPollRateIntervalMilliseconds();

    /**
     * The sliding window interval used to measure the poll rate. Controls
     * allowed rate burstiness. For example if allowed rate is 10 per second and
     * poll rate interval is 100 milliseconds the poller is not going to allow
     * more then one poll per 100 milliseconds. If poll rate interval is 10
     * seconds then 100 request can be emitted as fast as possible, but then the
     * polling stops until 10 seconds pass.
     * 
     * @see #setMaximumPollRatePerSecond(double)
     */
    void setMaximumPollRateIntervalMilliseconds(int maximumPollRateIntervalMilliseconds);

    UncaughtExceptionHandler getUncaughtExceptionHandler();

    /**
     * Handler notified about poll request and other unexpected failures. The
     * default implementation logs the failures using ERROR level.
     */
    void setUncaughtExceptionHandler(UncaughtExceptionHandler uncaughtExceptionHandler);

    String getIdentity();

    /**
     * Set the identity that worker specifies in the poll requests. This value
     * ends up stored in the identity field of the corresponding Start history
     * event. Default is "pid"@"host".
     * 
     * @param identity
     *            maximum size is 256 characters.
     */
    void setIdentity(String identity);

    long getPollBackoffInitialInterval();

    /**
     * Failed poll requests are retried after an interval defined by an
     * exponential backoff algorithm. See BackoffThrottler for more info.
     * 
     * @param backoffInitialInterval
     *            the interval between failure and the first retry. Default is
     *            100.
     */
    void setPollBackoffInitialInterval(long backoffInitialInterval);

    long getPollBackoffMaximumInterval();

    /**
     * @see WorkerBase#setPollBackoffInitialInterval(long)
     * 
     * @param backoffMaximumInterval
     *            maximum interval between poll request retries. Default is
     *            60000 (one minute).
     */
    void setPollBackoffMaximumInterval(long backoffMaximumInterval);

    double getPollBackoffCoefficient();

    /**
     * @see WorkerBase#setPollBackoffInitialInterval(long)
     * 
     * @param backoffCoefficient
     *            coefficient that defines how fast retry interval grows in case
     *            of poll request failures. Default is 2.0.
     */
    void setPollBackoffCoefficient(double backoffCoefficient);

    boolean isDisableServiceShutdownOnStop();

    /**
     * When set to false (which is default) at the beginning of the worker
     * shutdown {@link AmazonSimpleWorkflow#shutdown()} is called. It causes all
     * outstanding long poll request to disconnect. But also causes all future
     * request (for example activity completions) to SWF fail.
     */
    void setDisableServiceShutdownOnStop(boolean disableServiceShutdownOnStop);

    int getPollThreadCount();

    /**
     * Defines how many concurrent threads are used by the given worker to poll
     * the specified task list. Default is 1. Note that in case of
     * {@link ActivityWorker} two separate threads pools are used. One for
     * polling and another one for executing activities. The size of the
     * activity execution thread pool is defined through
     * {@link ActivityWorker#setTaskExecutorThreadPoolSize(int)}.
     */
    void setPollThreadCount(int threadCount);

    /**
     * Try to register every type (activity or workflow depending on worker)
     * that are configured with the worker.
     * 
     * @see #setDisableTypeRegistrationOnStart(boolean)
     */
    void registerTypesToPoll();

    boolean isRunning();

    /**
     * When set to true disables types registration on start even if
     * {@link SkipTypeRegistration} is not specified. Types still can be
     * registered by calling {@link #registerTypesToPoll()}.
     */
    void setDisableTypeRegistrationOnStart(boolean disableTypeRegistrationOnStart);

    boolean isDisableTypeRegistrationOnStart();

}