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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