Akka Multi Node Testing
jen
I tried translate to Java of the existing Scala codes:
public class ClusterTest {
protected RoleName first;
@Test
public void SimpleClusterListenerClusterJoinTest() throws Exception {
new MultiNodeSpec(new MultiNodeConfig() {{
first = this.role("first");
second = this.role("second");
third = this.role("third");
this.commonConfig(ConfigFactory.parseString(
"akka.crdt.convergent.leveldb.destroy-on-shutdown = on\n" +
"akka.actor.provider = akka.cluster.ClusterActorRefProvider\n" +
"akka.cluster.auto-join = off\n" +
"akka.cluster.auto-down = on\n" +
"akka.loggers = [\"akka.testkit.TestEventListener\"]\n" +
"akka.loglevel = INFO\n" +
"akka.remote.log-remote-lifecycle-events = off")); }}) {
{
Address firstAddress = node(first).address();
@SuppressWarnings("serial")
ArrayList<RoleName> firstnode = new ArrayList<RoleName>() {{
add(first);
}};
Seq<RoleName> fisrtnodeseq = (Seq<RoleName>)JavaConversions.asScalaBuffer(firstnode).toList();
runOn(fisrtnodeseq, null);
Cluster cluster = new Cluster((ExtendedActorSystem) system());
cluster.join(firstAddress);
// verify that single node becomes member
cluster.subscribe(testActor(), MemberEvent.class);
expectMsg(MemberUp.class);
}
@Override
public int initialParticipants() {
return roles().size();
}};
}
}
HOWEVER During the run with the arguments: -Dmultinode.max-nodes=4 -Dmultinode.host=127.0.0.1 etc. according to Multi Node Testing I will get the following error:
java.lang.IllegalArgumentException: invalid ActorSystem name [ClusterTest_2], must contain only word characters (i.e. [a-zA-Z0-9] plus non-leading '-')
at akka.actor.ActorSystemImpl.<init>(ActorSystem.scala:497)
at akka.actor.ActorSystem$.apply(ActorSystem.scala:141)
at akka.actor.ActorSystem$.apply(ActorSystem.scala:118)
at akka.remote.testkit.MultiNodeSpec.<init>(MultiNodeSpec.scala:252)
at com.akkamint.demo.ClusterTest$2.<init>(ClusterTest.java:51)
is the internally generated ActorSystem name wrong?
Besides this I have two questions:
1. How can access the gossips from Java as in the Scala code,
awaitCond(Cluster(system).latestGossip.members.exists(m ⇒ m.address == firstAddress && m.status == Up))
as I have not found any way to implement the same in Java. My workaround is to subscribe to member events (see above), otherwise I do not know, is if this effectively the same or not?
2. Thunk function (the second argument of runOn method)? What is that? How can use it?
I appreciate your help.
Björn Antonsson
Yes, the testkit code is unfortunately broken. An issue has been opened here https://github.com/akka/akka/issues/15956
Your code also has an problem. You shouldn't do "new Cluster(...)" but instead "Cluster.get(...)".
Besides this I have two questions:
1. How can access the gossips from Java as in the Scala code,awaitCond(Cluster(system).latestGossip.members.exists(m ⇒ m.address == firstAddress && m.status == Up))as I have not found any way to implement the same in Java. My workaround is to subscribe to member events (see above), otherwise I do not know, is if this effectively the same or not?
The awaitCond waits until you see the firstMember as Up, while your code will get a message for all member events. You could try to use the JavaTestKit instead by creating one inside the MultiNodeSpec.
2. Thunk function (the second argument of runOn method)? What is that? How can use it?
You should supply a function that runs the code that you want to run. It's a scala,Function, and you could implement it like this.
runOn(fisrtnodeseq, new AbstractFunction0<BoxedUnit>() {
@Override
public BoxedUnit apply() {
// Do your thing here
return null;
}
});
B/
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I appreciate your help.
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jen
Martynas Mickevičius
when this bug is closed it will have a milestone corresponding to the Akka version it has been fixed.
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Csaba Jeney
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Ez az üzenet és bármely melléklete kizárólag a címzettnek szól. Tartalmazhat bizalmas, szellemi tulajdonnak minősülő illetve más jogvédett információkat vagy egyéb módon lehet védve jogszabályok által. Ha nem Ön a szándékozott címzettje, nem használhatja fel,nem hozhatja nyilvánosságra és nem másolhatja ezt az üzenetet, annak mellékletét vagy bármely részét, és nem cselekedhet az üzenet tartalmában bízva. Ebben az esetben kérjük, értesítse a feladót haladéktalanul, és törölje ezt az üzenetet és minden mellékletét rendszerébõl. A levél és tartalmának, felhatalmazás nélküli, másolása, arhíválása jogellenes.
A levél nyomtatásakor, kérjük, vegye figyelembe a környezetünk védelmét.
Slawek Mazur
did you manage to run this code sample? I'm on version 2.11:2.4.7 and I can't figure out how to configure MultiNode config for Java.
Best
SM
Csaba Jeney
Csaba
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