[英]Java Akka Scheduling API throwing MissingMethodException
在此处使用Akka com.typesafe.akka:akka-actor_2.11:2.5.4
Java 8(还是Groovy)。 我正在尝试创建一个演员( AppMaster
),该演员创建/拥有/管理另一个演员( StateChecker
),并计划每4秒向此StateChecker
发送一条CheckState
消息:
class CheckState {}
class StateChecker extends AbstractActor {
// For this question, it really doesn't matter what this actor does
}
class AppMaster extends AbstractActor {
ActorRef stateChecker
@Override
Receive createReceive() {
receiveBuilder()
.match(Init, { message ->
stateChecker = context.actorOf(Props.create(StateChecker, "yes", 20), "state-checker")
FiniteDuration startDur = Duration.Zero()
FiniteDuration freqDur = Duration.create(4000, TimeUnit.MILLISECONDS)
CheckState checkState = new CheckState()
ExecutionContextExecutor executor = context.system().dispatcher()
context.system().scheduler().schedule(startDur, freqDur, stateChecker, checkState,
executor)
})
.build()
}
}
运行此命令时,出现以下异常:
groovy.lang.MissingMethodException: No signature of method: akka.actor.LightArrayRevolverScheduler.schedule() is applicable for argument types: (scala.concurrent.duration.FiniteDuration, scala.concurrent.duration.FiniteDuration, akka.actor.LocalActorRef, com.me.myapp.messages.CheckState, akka.dispatch.Dispatcher) values: [0 days, 4000 milliseconds, Actor[akka://myapp/user/myapp-master/o1-keeper#-1837899613], ...]
Possible solutions: schedule(scala.concurrent.duration.FiniteDuration, scala.concurrent.duration.FiniteDuration, java.lang.Runnable, scala.concurrent.ExecutionContext), schedule(scala.concurrent.duration.FiniteDuration, scala.concurrent.duration.FiniteDuration, scala.Function0, scala.concurrent.ExecutionContext), schedule(scala.concurrent.duration.FiniteDuration, scala.concurrent.duration.FiniteDuration, akka.actor.ActorRef, java.lang.Object, scala.concurrent.ExecutionContext, akka.actor.ActorRef)
at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.unwrap(ScriptBytecodeAdapter.java:58)
at org.codehaus.groovy.runtime.callsite.PojoMetaClassSite.call(PojoMetaClassSite.java:49)
我添加了日志语句,并且在调度期间引发了异常:
context.system().scheduler().schedule(startDur, freqDur, stateChecker, checkState,
executor)
任何想法我需要做些什么来解决? 由于这是Akka的Java API遇到的一个问题,因此我确实需要答案通过Java API。
问题在于,您要传递给schedule()
方法的参数与该方法的重载版本都不匹配。 您可以在JavaDoc中看到schedule()
重载版本的签名。
您尝试使用的版本是以下方法 :
Cancellable schedule(scala.concurrent.duration.FiniteDuration initialDelay,
scala.concurrent.duration.FiniteDuration interval,
ActorRef receiver,
java.lang.Object message,
scala.concurrent.ExecutionContext executor,
ActorRef sender)
您缺少最后一个参数,它是一个ActorRef
,被指定为计划邮件的发送者。 如果StateChecker
不在乎谁StateChecker
发送CheckState
消息,那么最简单的解决方法是将null
作为最后一个参数传递:
context.system()
.scheduler()
.schedule(startDur, freqDur, stateChecker, checkState, executor, null)
// ^
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