akka简单示例-1
刚刚开始接触akka，网上找了2个简单示例，并在公司运营机器上尝试，踩了一些坑，在此记录。
1. 本地hello world
[torstan@sparkb5-i ~/akka_example/hello_world]$ cat src/helloWorld.scala
package our.examples
import akka.actor.Actor
import akka.actor.ActorSystem
import akka.actor.Props class HelloActor extends Actor {
def receive = {
case "hello" => println("hello back at you")
case _ => println("huh?")
}
} object HelloApp extends App {
override def main(args: Array[String]){
val system = ActorSystem("HelloSystem")
// default Actor constructor
val helloActor = system.actorOf(Props[HelloActor], name = "helloactor")
helloActor ! "hello"
helloActor ! "buenos dias"
}
}
[torstan@sparkb5-i ~/akka_example/hello_world]$ cat Makefile
SRC_DIR := src
SRC := $(shell find ${SRC_DIR} -name "*.scala")
DIR=our TARGET := HelloApp.jar SCALAC := scalac
SCFLAGS := /usr/local/scala-2.10.4/lib/akka-actors.jar .PHONY: all clean all: ${TARGET} ${TARGET}: ${SRC}
${SCALAC} -cp ${SCFLAGS} $^ clean:
${RM} -r ${TARGET} ${DIR}
[torstan@sparkb5-i ~/akka_example/hello_world]$ cat run.sh
#!/bin/bash java -cp \
.:/usr/local/scala-2.10.4/lib/scala-library.jar:/usr/local/scala-2.10.4/lib/akka-actors.jar:/usr/local/scala-2.10.4/lib/typesafe-config.jar\
our.examples.HelloApp
执行结果：
[torstan@sparkb5-i ~/akka_example/hello_world]$ ./run.sh
hello back at you
huh?
2. 简单CS示例
server端：
[torstan@sparkb5-i ~/akka_example/remote_service/server]$ cat src/HelloRemote.scala
package remote
import akka.actor.Actor
import akka.actor.ActorSystem
import akka.actor.Props class RemoteActor extends Actor{
def receive = {
case msg:String =>
println(s"RemoteActor received message '$msg'")
sender ! "hello from RemoteActor"
}
} object HelloRemote extends App{
val system = ActorSystem("HelloRemoteSystem")
val remoteActor = system.actorOf(Props[RemoteActor], name="RemoteActor")
remoteActor ! "The remote actor is alive"
}
[torstan@sparkb5-i ~/akka_example/remote_service/server]$ cat application.conf
akka {
loglevel = "DEBUG"
actor {
provider = "akka.remote.RemoteActorRefProvider"
}
remote {
transport = "akka.remote.netty.NettyRemoteTransport"
//log-sent-messages = on
//log-received-messages = on
netty {
hostname = "172.27.6.240"
port = 5150
}
}
}
[torstan@sparkb5-i ~/akka_example/remote_service/server]$ cat Makefile
SRC_DIR := src
SRC := $(shell find ${SRC_DIR} -name "*.scala")
DIR=remote TARGET := HelloRemote.jar SCALAC := scalac
SCFLAGS := /usr/local/scala-2.10.4/lib/akka-actors.jar .PHONY: all clean all: ${TARGET} ${TARGET}: ${SRC}
${SCALAC} -cp ${SCFLAGS} $^ clean:
${RM} -r ${TARGET} ${DIR}
[torstan@sparkb5-i ~/akka_example/remote_service/server]$ cat run.sh
#!/bin/bash AKKA_LIB_PATH="/usr/local/akka-2.1.4/lib/akka/" java -cp \
.:/usr/local/scala-2.10.4/lib/scala-library.jar:/usr/local/scala-2.10.4/lib/akka-actors.jar:/usr/local/scala-2.10.4/lib/typesafe-config.jar:${AKKA_LIB_PATH}/akka-remote_2.10-2.1.4.jar:${AKKA_LIB_PATH}/protobuf-java-2.4.1.jar:${AKKA_LIB_PATH}/netty-3.5.8.Final.jar \
remote.HelloRemote
client端：
[torstan@sparkb5-i ~/akka_example/remote_service/client]$ cat src/HelloLocal.scala
package client
import akka.actor._ object HelloLocal extends App{
implicit val system = ActorSystem("LocalSystem")
val localActor = system.actorOf(Props[LocalActor], name="LocalActor")
localActor ! "START"
} class LocalActor extends Actor{
val remote = context.actorFor("akka://HelloRemoteSystem@172.27.6.240:5150/user/RemoteActor")
var counter = 0
def receive = {
case "START" =>
remote ! "HELLO from the LocalActor"
case msg:String =>
println(s"LocalActor received message: '$msg'")
if(counter < 5){
sender ! "hello back to you"
counter += 1
}
}
}
[torstan@sparkb5-i ~/akka_example/remote_service/client]$ cat application.conf
akka {
//loglevel = "DEBUG"
actor {
provider = "akka.remote.RemoteActorRefProvider"
}
remote {
transport = "akka.remote.netty.NettyRemoteTransport"
//log-sent-messages = on
//log-received-messages = on
netty {
hostname = "127.0.0.1"
port = 0
}
}
}
[torstan@sparkb5-i ~/akka_example/remote_service/client]$ cat Makefile
SRC_DIR := src
SRC := $(shell find ${SRC_DIR} -name "*.scala")
DIR=client TARGET := HelloLocal.jar SCALAC := scalac
SCFLAGS := /usr/local/scala-2.10.4/lib/akka-actors.jar .PHONY: all clean all: ${TARGET} ${TARGET}: ${SRC}
${SCALAC} -cp ${SCFLAGS} $^ clean:
${RM} -r ${TARGET} ${DIR}
[torstan@sparkb5-i ~/akka_example/remote_service/client]$ cat run.sh
#!/bin/bash AKKA_LIB_PATH="/usr/local/akka-2.1.4/lib/akka/" java -cp \
.:/usr/local/scala-2.10.4/lib/scala-library.jar:/usr/local/scala-2.10.4/lib/akka-actors.jar:/usr/local/scala-2.10.4/lib/typesafe-config.jar:${AKKA_LIB_PATH}/akka-remote_2.10-2.1.4.jar:${AKKA_LIB_PATH}/protobuf-java-2.4.1.jar:${AKKA_LIB_PATH}/netty-3.5.8.Final.jar \
client.HelloLocal
执行结果：
[root@sparkb5-0 /data/torstan/akka_example/remote_service/server]# ./run.sh
[DEBUG] [12/10/2014 17:31:57.074] [main] [EventStream(akka://HelloRemoteSystem)] logger log1-Logging$DefaultLogger started
[DEBUG] [12/10/2014 17:31:57.080] [main] [EventStream(akka://HelloRemoteSystem)] Default Loggers started
[INFO] [12/10/2014 17:31:57.269] [main] [NettyRemoteTransport(akka://HelloRemoteSystem@172.27.6.240:5150)] RemoteServerStarted@akka://HelloRemoteSystem@172.27.6.240:5150
RemoteActor received message 'The remote actor is alive'
[INFO] [12/10/2014 17:32:01.768] [HelloRemoteSystem-10] [NettyRemoteTransport(akka://HelloRemoteSystem@172.27.6.240:5150)] RemoteClientStarted@akka://LocalSystem@127.0.0.1:48437
[DEBUG] [12/10/2014 17:32:01.769] [HelloRemoteSystem-10] [RemoteClient(akka://HelloRemoteSystem)] Starting remote client connection to [akka://LocalSystem@127.0.0.1:48437]
[DEBUG] [12/10/2014 17:32:01.771] [HelloRemoteSystem-10] [NettyRemoteTransport(akka://HelloRemoteSystem@172.27.6.240:5150)] RemoteServerClientConnected@akka://HelloRemoteSystem@172.27.6.240:5150: Client[akka://LocalSystem@127.0.0.1:48437]
RemoteActor received message 'HELLO from the LocalActor'
[DEBUG] [12/10/2014 17:32:01.782] [HelloRemoteSystem-akka.actor.default-dispatcher-2] [akka.serialization.Serialization(akka://HelloRemoteSystem)] Using serializer[akka.serialization.JavaSerializer] for message [java.lang.String]
RemoteActor received message 'hello back to you'
RemoteActor received message 'hello back to you'
RemoteActor received message 'hello back to you'
RemoteActor received message 'hello back to you'
RemoteActor received message 'hello back to you'
[torstan@sparkb5-i ~/akka_example/remote_service/client]$ ./run.sh
[INFO] [12/10/2014 17:32:01.668] [main] [NettyRemoteTransport(akka://LocalSystem@127.0.0.1:48437)] RemoteServerStarted@akka://LocalSystem@127.0.0.1:48437
[INFO] [12/10/2014 17:32:01.755] [LocalSystem-akka.actor.default-dispatcher-3] [NettyRemoteTransport(akka://LocalSystem@127.0.0.1:48437)] RemoteClientStarted@akka://HelloRemoteSystem@172.27.6.240:5150
LocalActor received message: 'hello from RemoteActor'
LocalActor received message: 'hello from RemoteActor'
LocalActor received message: 'hello from RemoteActor'
LocalActor received message: 'hello from RemoteActor'
LocalActor received message: 'hello from RemoteActor'
LocalActor received message: 'hello from RemoteActor'
遇到的坑：
[torstan@sparkb5-i ~/akka_example/remote_service/client]$ ./run.sh
Exception in thread "main" java.lang.ClassNotFoundException: akka.remote.RemoteActorRefProvider
at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:270)
at akka.actor.ReflectiveDynamicAccess$$anonfun$getClassFor$1.apply(DynamicAccess.scala:68)
at akka.actor.ReflectiveDynamicAccess$$anonfun$getClassFor$1.apply(DynamicAccess.scala:67)
at scala.util.Try$.apply(Try.scala:161)
google到答案是没有加载依赖文件akka-remote.jar，后来发现是没有安装akka。
2. Exception in thread "main" java.lang.NoSuchMethodException: akka.remote.RemoteActorRefProvider.<init>(java.lang.String, akka.actor.ActorSystem$Settings, akka.event.EventStream, akka.actor.Scheduler, akka.actor.DynamicAccess
google到答案：
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