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CB-580: fail a ticket when its member reaches a terminal health state
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FleetHealthMonitor now requires a failTarget BiConsumer<String,String>
collaborator (no defaulting overload) and calls it exactly once when a
member transitions into GONE or NEVER_READY, via CB-568's idempotent
target-wide abandon() operation. The reason string names the real
terminal state. failTarget invocation retries up to
MAX_FAIL_TARGET_ATTEMPTS (3) within the same transition if it throws,
and never refires on a later tick where the state is unchanged.

Bridged.java wires messages::abandon as the production failTarget.
This commit is contained in:
Dai Ha
2026-08-15 07:54:28 +02:00
parent 2f48e08f1f
commit 0af902ec43
3 changed files with 140 additions and 5 deletions
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bridged/src/test/java/dev/ltms/bridged/health/FleetHealthMonitorTest.java
+92 -3
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@@ -20,8 +20,10 @@ import org.slf4j.LoggerFactory;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.Executors;
import java.util.function.BiConsumer;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertTrue;
class FleetHealthMonitorTest {
@Test void oneTickUsesOneFleetListForAnyRosterSize() {
@@ -37,7 +39,8 @@ class FleetHealthMonitorTest {
herdr.calls.clear();
MessageService messages = new MessageService(agents, new Injector(agents), new Rendezvous(), new InMemoryReplyInbox());
var scheduler = Executors.newSingleThreadScheduledExecutor();
FleetHealthMonitor monitor = new FleetHealthMonitor(agents, sessions::roster, messages, scheduler, () -> 1, 60);
FleetHealthMonitor monitor = new FleetHealthMonitor(agents, sessions::roster, messages, scheduler, () -> 1, 60,
(_, _) -> { });
monitor.tick();
monitor.stop();
assertEquals(1, herdr.calls.stream().filter(call -> call.method().equals("agent.list")).count());
@@ -49,7 +52,7 @@ class FleetHealthMonitorTest {
var scheduler = Executors.newSingleThreadScheduledExecutor();
FleetHealthMonitor monitor = new FleetHealthMonitor(agents, java.util.List::of,
new MessageService(agents, new Injector(agents), new Rendezvous(), new InMemoryReplyInbox()),
scheduler, () -> 1, 60);
scheduler, () -> 1, 60, (_, _) -> { });
monitor.tick();
herdr.healthy(true);
monitor.tick();
@@ -68,7 +71,7 @@ class FleetHealthMonitorTest {
var scheduler = Executors.newSingleThreadScheduledExecutor();
FleetHealthMonitor monitor = new FleetHealthMonitor(agents, java.util.List::of,
new MessageService(agents, new Injector(agents), new Rendezvous(), new InMemoryReplyInbox()),
scheduler, () -> 1, 60);
scheduler, () -> 1, 60, (_, _) -> { });
monitor.reportTransition("term_a", HealthState.TURN_BOUNDARY_LOST);
monitor.reportTransition("term_a", HealthState.TURN_BOUNDARY_LOST);
monitor.stop();
@@ -78,4 +81,90 @@ class FleetHealthMonitorTest {
logger.detachAppender(appender);
}
}
// --- CB-580: a member that reaches GONE/NEVER_READY must fail its waiting tickets
private static FleetHealthMonitor monitorWith(BiConsumer<String, String> failTarget) {
FakeHerdr herdr = new FakeHerdr();
AgentControl agents = new AgentControl(herdr);
var scheduler = Executors.newSingleThreadScheduledExecutor();
return new FleetHealthMonitor(agents, java.util.List::of,
new MessageService(agents, new Injector(agents), new Rendezvous(), new InMemoryReplyInbox()),
scheduler, () -> 1, 60, failTarget);
}
@Test void terminalTransitionFailsTheTargetOnce() {
RecordingFailTarget failTarget = new RecordingFailTarget();
FleetHealthMonitor monitor = monitorWith(failTarget);
monitor.reportTransition("term_a", HealthState.GONE);
monitor.stop();
assertEquals(1, failTarget.calls.size());
assertEquals("term_a", failTarget.calls.get(0).target());
assertTrue(failTarget.calls.get(0).reason().contains("GONE"));
}
@Test void neverReadyNamesItselfAsTheReason() {
RecordingFailTarget failTarget = new RecordingFailTarget();
FleetHealthMonitor monitor = monitorWith(failTarget);
monitor.reportTransition("term_a", HealthState.NEVER_READY);
monitor.stop();
assertEquals(1, failTarget.calls.size());
assertTrue(failTarget.calls.get(0).reason().contains("NEVER_READY"));
}
@Test void stayingInATerminalStateProducesOneFailureNotN() {
RecordingFailTarget failTarget = new RecordingFailTarget();
FleetHealthMonitor monitor = monitorWith(failTarget);
monitor.reportTransition("term_a", HealthState.GONE);
monitor.reportTransition("term_a", HealthState.GONE);
monitor.reportTransition("term_a", HealthState.GONE);
monitor.reportTransition("term_a", HealthState.GONE);
monitor.stop();
assertEquals(1, failTarget.calls.size());
}
@Test void aNonTerminalFaultStateDoesNotFailTheTarget() {
RecordingFailTarget failTarget = new RecordingFailTarget();
FleetHealthMonitor monitor = monitorWith(failTarget);
monitor.reportTransition("term_a", HealthState.TURN_BOUNDARY_LOST);
monitor.stop();
assertEquals(0, failTarget.calls.size());
}
@Test void failTargetRetryIsBounded() {
AlwaysThrowingFailTarget failTarget = new AlwaysThrowingFailTarget();
FleetHealthMonitor monitor = monitorWith(failTarget);
monitor.reportTransition("term_a", HealthState.GONE);
monitor.stop();
assertEquals(FleetHealthMonitor.MAX_FAIL_TARGET_ATTEMPTS, failTarget.calls);
}
@Test void exhaustedRetryStillDoesNotRefireOnAnUnchangedTick() {
AlwaysThrowingFailTarget failTarget = new AlwaysThrowingFailTarget();
FleetHealthMonitor monitor = monitorWith(failTarget);
monitor.reportTransition("term_a", HealthState.GONE);
int afterFirstTransition = failTarget.calls;
monitor.reportTransition("term_a", HealthState.GONE);
monitor.stop();
assertEquals(afterFirstTransition, failTarget.calls);
}
private record RecordedCall(String target, String reason) { }
private static final class RecordingFailTarget implements BiConsumer<String, String> {
final java.util.List<RecordedCall> calls = new java.util.ArrayList<>();
@Override public void accept(String target, String reason) {
calls.add(new RecordedCall(target, reason));
}
}
private static final class AlwaysThrowingFailTarget implements BiConsumer<String, String> {
int calls = 0;
@Override public void accept(String target, String reason) {
calls++;
throw new RuntimeException("boom");
}
}
}