akka学习教程(九) STM软件事务内存

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akka系列文章目录

  • akka学习教程(十四) akka分布式实战
  • akka学习教程(十三) akka分布式
  • akka学习教程(十二) Spring与Akka的集成
  • akka学习教程(十一) akka持久化
  • akka学习教程(十) agent
  • akka学习教程(九) STM软件事务内存
  • akka学习教程(八) Actor中的Future-询问模式
  • akka学习教程(七) 内置状态转换Procedure
  • akka学习教程(六) 路由器Router
  • akka学习教程(五) inbox消息收件箱
  • akka学习教程(四) actor生命周期
  • akka学习教程(三) 不可变对象
  • akka学习教程(二)HelloWord
  • akka学习教程(一)简介

软件事务内存(STM):顾名思义,这是事务。与关系型数据库中的事务类似,具有ACID属性。
在分布式任务中,有可能会有和事务相关的处理,这里将举例说明AKKA中STM的用法。

假设公司给员工发工资业务,CompanyActor是公司actor, EmployeeActor是员工actor,公司账户减钱,员工账户加钱,这就要求事务。代码中有重要注释。

package akka.stm;import akka.actor.ActorRef;import akka.actor.ActorSystem;import akka.actor.Props;import akka.pattern.Patterns;import akka.transactor.Coordinated;import akka.util.Timeout;import com.typesafe.config.ConfigFactory;import scala.concurrent.Await;import java.util.concurrent.TimeUnit;/** * Created by liubenlong on 2017/1/16. */public class STMMain {    public static ActorRef companyActor = null;    public static ActorRef employeeActor = null;    public static void main(String [] args) throws Exception {        ActorSystem system = ActorSystem.create("stm", ConfigFactory.load("akka.conf"));        companyActor = system.actorOf(Props.create(CompanyActor.class), "CompanyActor");        employeeActor = system.actorOf(Props.create(EmployeeActor.class), "EmployeeActor");        Timeout timeout = new Timeout(1, TimeUnit.SECONDS);        for(int i = 0 ; i < 23; i ++){            companyActor.tell(new Coordinated(i, timeout), ActorRef.noSender());            Thread.sleep(200);            int companyCount = (int) Await.result(Patterns.ask(companyActor, "getCount", timeout), timeout.duration());            int employeeCount = (int) Await.result(Patterns.ask(employeeActor, "getCount", timeout), timeout.duration());            System.out.println("companyCount = " + companyCount + ";employeeCount = " + employeeCount);            System.out.println("-----------------------");        }    }}
package akka.stm;import akka.actor.*;import akka.event.Logging;import akka.event.LoggingAdapter;import akka.transactor.Coordinated;import scala.concurrent.stm.Ref;import scala.concurrent.stm.japi.STM;/** * Created by liubenlong on 2017/1/12. */public class CompanyActor extends UntypedActor {    private final LoggingAdapter log = Logging.getLogger(getContext().system(), this);    private Ref.View<Integer> count = STM.newRef(100);//定义账户余额    @Override    public void onReceive(Object o) throws Throwable {        if(o instanceof Coordinated){            Coordinated coordinated = (Coordinated) o;            int downCount = (int) coordinated.getMessage();//传递过来的参数,减多少。            STMMain.employeeActor.tell(coordinated.coordinate(downCount), getSelf());//通知employeeActor增加费用            try {//注意这里异常要及时处理,否则异常会一直扩散,导致回退到系统刚启动时的初始状态!                coordinated.atomic(() -> {                    if(count.get() < downCount) throw new RuntimeException("余额不足!");                    STM.increment(count, -downCount);//减余额                });            }catch (Exception e){                e.printStackTrace();            }        }else if("getCount".equals(o)){            getSender().tell(count.get(), getSelf());        }else{            unhandled(o);        }    }}
package akka.stm;import akka.actor.UntypedActor;import akka.event.Logging;import akka.event.LoggingAdapter;import akka.transactor.Coordinated;import scala.concurrent.stm.Ref;import scala.concurrent.stm.japi.STM;/** * Created by liubenlong on 2017/1/12. */public class EmployeeActor extends UntypedActor {    private final LoggingAdapter log = Logging.getLogger(getContext().system(), this);    private Ref.View<Integer> count = STM.newRef(20);//员工账户    @Override    public void onReceive(Object o) throws Throwable {        if(o instanceof Coordinated){            Coordinated coordinated = (Coordinated) o;            int downCount = (int) coordinated.getMessage();//员工增加的工资            try {//注意这里异常要及时处理,否则异常会一直扩散,导致回退到系统刚启动时的初始状态!                coordinated.atomic(() -> STM.increment(count, downCount));//Employee增加工资            }catch (Exception e){                e.printStackTrace();            }        }else if("getCount".equals(o)){            getSender().tell(count.get(), getSelf());        }else{            unhandled(o);        }    }}

运行结果:

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Files (x86)\ideaIU-2016.2.5\lib\idea_rt.jar" com.intellij.rt.execution.application.AppMain akka.stm.STMMaincompanyCount = 100;employeeCount = 20-----------------------companyCount = 99;employeeCount = 21-----------------------companyCount = 97;employeeCount = 23-----------------------companyCount = 94;employeeCount = 26-----------------------companyCount = 90;employeeCount = 30-----------------------companyCount = 85;employeeCount = 35-----------------------companyCount = 79;employeeCount = 41-----------------------companyCount = 72;employeeCount = 48-----------------------companyCount = 64;employeeCount = 56-----------------------companyCount = 55;employeeCount = 65-----------------------companyCount = 45;employeeCount = 75-----------------------companyCount = 34;employeeCount = 86-----------------------companyCount = 22;employeeCount = 98-----------------------java.lang.RuntimeException: 余额不足!    at akka.stm.CompanyActor.lambda$onReceive$0(CompanyActor.java:34)    at akka.transactor.Coordinated$$anonfun$atomic$1.apply(Coordinated.scala:157)at akka.transactor.Coordinated$$anonfun$atomic$1.apply(Coordinated.scala:157)    at scala.concurrent.stm.ccstm.CommitBarrierImpl$MemberImpl$$anonfun$atomic$1.apply(CommitBarrierImpl.scala:50)    at scala.concurrent.stm.ccstm.CommitBarrierImpl$MemberImpl$$anonfun$atomic$1.apply(CommitBarrierImpl.scala:43)    at scala.concurrent.stm.ccstm.InTxnImpl.runBlock(InTxnImpl.scala:560)    at scala.concurrent.stm.ccstm.InTxnImpl.topLevelAttempt(InTxnImpl.scala:516)    at scala.concurrent.stm.ccstm.InTxnImpl.topLevelAtomicImpl(InTxnImpl.scala:387)    at scala.concurrent.stm.ccstm.InTxnImpl.atomic(InTxnImpl.scala:248)    at scala.concurrent.stm.ccstm.CCSTMExecutor.apply(CCSTMExecutor.scala:24)    at scala.concurrent.stm.ccstm.CommitBarrierImpl$MemberImpl.atomic(CommitBarrierImpl.scala:43)    at akka.transactor.Coordinated.atomic(Coordinated.scala:141)    at akka.transactor.Coordinated.atomic(Coordinated.scala:157)    at akka.stm.CompanyActor.onReceive(CompanyActor.java:33)    at akka.actor.UntypedActor$$anonfun$receive$1.applyOrElse(UntypedActor.scala:165)at akka.actor.Actor$class.aroundReceive(Actor.scala:496)at akka.actor.UntypedActor.aroundReceive(UntypedActor.scala:95)at akka.actor.ActorCell.receiveMessage(ActorCell.scala:526)at akka.actor.ActorCell.invoke(ActorCell.scala:495)at akka.dispatch.Mailbox.processMailbox(Mailbox.scala:257)at akka.dispatch.Mailbox.run(Mailbox.scala:224)at akka.dispatch.Mailbox.exec(Mailbox.scala:234)at scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260)at scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339)at scala.concurrent.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979)at scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107)akka.transactor.CoordinatedTransactionException: Exception in coordinated atomicat akka.transactor.Coordinated.atomic(Coordinated.scala:144)at akka.transactor.Coordinated.atomic(Coordinated.scala:157)at akka.stm.EmployeeActor.onReceive(EmployeeActor.java:25)at akka.actor.UntypedActor$$anonfun$receive$1.applyOrElse(UntypedActor.scala:165)    at akka.actor.Actor$class.aroundReceive(Actor.scala:496)    at akka.actor.UntypedActor.aroundReceive(UntypedActor.scala:95)    at akka.actor.ActorCell.receiveMessage(ActorCell.scala:526)    at akka.actor.ActorCell.invoke(ActorCell.scala:495)    at akka.dispatch.Mailbox.processMailbox(Mailbox.scala:257)    at akka.dispatch.Mailbox.run(Mailbox.scala:224)    at akka.dispatch.Mailbox.exec(Mailbox.scala:234)    at scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260)    at scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339)    at scala.concurrent.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979)    at scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107)Caused by: java.lang.RuntimeException: 余额不足!    at akka.stm.CompanyActor.lambda$onReceive$0(CompanyActor.java:34)    at akka.transactor.Coordinated$$anonfun$atomic$1.apply(Coordinated.scala:157)at akka.transactor.Coordinated$$anonfun$atomic$1.apply(Coordinated.scala:157)    at scala.concurrent.stm.ccstm.CommitBarrierImpl$MemberImpl$$anonfun$atomic$1.apply(CommitBarrierImpl.scala:50)    at scala.concurrent.stm.ccstm.CommitBarrierImpl$MemberImpl$$anonfun$atomic$1.apply(CommitBarrierImpl.scala:43)    at scala.concurrent.stm.ccstm.InTxnImpl.runBlock(InTxnImpl.scala:560)    at scala.concurrent.stm.ccstm.InTxnImpl.topLevelAttempt(InTxnImpl.scala:516)    at scala.concurrent.stm.ccstm.InTxnImpl.topLevelAtomicImpl(InTxnImpl.scala:387)    at scala.concurrent.stm.ccstm.InTxnImpl.atomic(InTxnImpl.scala:248)    at scala.concurrent.stm.ccstm.CCSTMExecutor.apply(CCSTMExecutor.scala:24)    at scala.concurrent.stm.ccstm.CommitBarrierImpl$MemberImpl.atomic(CommitBarrierImpl.scala:43)    at akka.transactor.Coordinated.atomic(Coordinated.scala:141)    at akka.transactor.Coordinated.atomic(Coordinated.scala:157)    at akka.stm.CompanyActor.onReceive(CompanyActor.java:33)    ... 12 morecompanyCount = 9;employeeCount = 111-----------------------java.lang.RuntimeException: 余额不足!companyCount = 9;employeeCount = 111    at akka.stm.CompanyActor.lambda$onReceive$0(CompanyActor.java:34)-----------------------    at akka.transactor.Coordinated$$anonfun$atomic$1.apply(Coordinated.scala:157)at akka.transactor.Coordinated$$anonfun$atomic$1.apply(Coordinated.scala:157)    at scala.concurrent.stm.ccstm.CommitBarrierImpl$MemberImpl$$anonfun$atomic$1.apply(CommitBarrierImpl.scala:50)    at scala.concurrent.stm.ccstm.CommitBarrierImpl$MemberImpl$$anonfun$atomic$1.apply(CommitBarrierImpl.scala:43)    at scala.concurrent.stm.ccstm.InTxnImpl.runBlock(InTxnImpl.scala:560)    at scala.concurrent.stm.ccstm.InTxnImpl.topLevelAttempt(InTxnImpl.scala:516)    at scala.concurrent.stm.ccstm.InTxnImpl.topLevelAtomicImpl(InTxnImpl.scala:387)    at scala.concurrent.stm.ccstm.InTxnImpl.atomic(InTxnImpl.scala:248)    at scala.concurrent.stm.ccstm.CCSTMExecutor.apply(CCSTMExecutor.scala:24)    at scala.concurrent.stm.ccstm.CommitBarrierImpl$MemberImpl.atomic(CommitBarrierImpl.scala:43)    at akka.transactor.Coordinated.atomic(Coordinated.scala:141)    at akka.transactor.Coordinated.atomic(Coordinated.scala:157)    at akka.stm.CompanyActor.onReceive(CompanyActor.java:33)    at akka.actor.UntypedActor$$anonfun$receive$1.applyOrElse(UntypedActor.scala:165)at akka.actor.Actor$class.aroundReceive(Actor.scala:496)at akka.actor.UntypedActor.aroundReceive(UntypedActor.scala:95)at akka.actor.ActorCell.receiveMessage(ActorCell.scala:526)at akka.actor.ActorCell.invoke(ActorCell.scala:495)at akka.dispatch.Mailbox.processMailbox(Mailbox.scala:257)at akka.dispatch.Mailbox.run(Mailbox.scala:224)at akka.dispatch.Mailbox.exec(Mailbox.scala:234)at scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260)at scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339)at scala.concurrent.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979)at scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107)akka.transactor.CoordinatedTransactionException: Exception in coordinated atomicat akka.transactor.Coordinated.atomic(Coordinated.scala:144)at akka.transactor.Coordinated.atomic(Coordinated.scala:157)at akka.stm.EmployeeActor.onReceive(EmployeeActor.java:25)at akka.actor.UntypedActor$$anonfun$receive$1.applyOrElse(UntypedActor.scala:165)    at akka.actor.Actor$class.aroundReceive(Actor.scala:496)    at akka.actor.UntypedActor.aroundReceive(UntypedActor.scala:95)    at akka.actor.ActorCell.receiveMessage(ActorCell.scala:526)    at akka.actor.ActorCell.invoke(ActorCell.scala:495)    at akka.dispatch.Mailbox.processMailbox(Mailbox.scala:257)    at akka.dispatch.Mailbox.run(Mailbox.scala:224)    at akka.dispatch.Mailbox.exec(Mailbox.scala:234)    at scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260)    at scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339)    at scala.concurrent.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979)    at scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107)Caused by: java.lang.RuntimeException: 余额不足!    at akka.stm.CompanyActor.lambda$onReceive$0(CompanyActor.java:34)    at akka.transactor.Coordinated$$anonfun$atomic$1.apply(Coordinated.scala:157)at akka.transactor.Coordinated$$anonfun$atomic$1.apply(Coordinated.scala:157)    at scala.concurrent.stm.ccstm.CommitBarrierImpl$MemberImpl$$anonfun$atomic$1.apply(CommitBarrierImpl.scala:50)    at scala.concurrent.stm.ccstm.CommitBarrierImpl$MemberImpl$$anonfun$atomic$1.apply(CommitBarrierImpl.scala:43)    at scala.concurrent.stm.ccstm.InTxnImpl.runBlock(InTxnImpl.scala:560)    at scala.concurrent.stm.ccstm.InTxnImpl.topLevelAttempt(InTxnImpl.scala:516)    at scala.concurrent.stm.ccstm.InTxnImpl.topLevelAtomicImpl(InTxnImpl.scala:387)    at scala.concurrent.stm.ccstm.InTxnImpl.atomic(InTxnImpl.scala:248)    at scala.concurrent.stm.ccstm.CCSTMExecutor.apply(CCSTMExecutor.scala:24)    at scala.concurrent.stm.ccstm.CommitBarrierImpl$MemberImpl.atomic(CommitBarrierImpl.scala:43)    at akka.transactor.Coordinated.atomic(Coordinated.scala:141)    at akka.transactor.Coordinated.atomic(Coordinated.scala:157)    at akka.stm.CompanyActor.onReceive(CompanyActor.java:33)    ... 12 morecompanyCount = 9;employeeCount = 111-----------------------java.lang.RuntimeException: 余额不足!    at akka.stm.CompanyActor.lambda$onReceive$0(CompanyActor.java:34)    at akka.transactor.Coordinated$$anonfun$atomic$1.apply(Coordinated.scala:157)at akka.transactor.Coordinated$$anonfun$atomic$1.apply(Coordinated.scala:157)    at scala.concurrent.stm.ccstm.CommitBarrierImpl$MemberImpl$$anonfun$atomic$1.apply(CommitBarrierImpl.scala:50)    at scala.concurrent.stm.ccstm.CommitBarrierImpl$MemberImpl$$anonfun$atomic$1.apply(CommitBarrierImpl.scala:43)    at scala.concurrent.stm.ccstm.InTxnImpl.runBlock(InTxnImpl.scala:560)    at scala.concurrent.stm.ccstm.InTxnImpl.topLevelAttempt(InTxnImpl.scala:516)

注意:需要引入transactor的maven配置:

<dependency>    <groupId>com.typesafe.akka</groupId>    <artifactId>akka-actor_2.11</artifactId>    <version>2.4.16</version></dependency><dependency>    <groupId>com.typesafe.akka</groupId>    <artifactId>akka-agent_2.11</artifactId>    <version>2.4.16</version></dependency><!-- https://mvnrepository.com/artifact/com.typesafe.akka/akka-transactor_2.10 --><dependency>    <groupId>com.typesafe.akka</groupId>    <artifactId>akka-transactor_2.10</artifactId>    <version>2.3.16</version></dependency>

参考资料

  • 书籍《java高并发程序设计》
  • AKKA官方文档
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