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Return early if LifecycleManager#stopServices() is called twice.

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This could happen if the app shuts down spontaneously (eg due to low memory) concurrently with a manual shutdown.
This commit is contained in:
akwizgran
2021-11-17 15:38:44 +00:00
parent 1b4ab4f945
commit 47085722da
2 changed files with 45 additions and 0 deletions
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4
bramble-core/src/main/java/org/briarproject/bramble/lifecycle/LifecycleManagerImpl.java
View File

@@ -190,6 +190,10 @@ class LifecycleManagerImpl implements LifecycleManager, MigrationListener {
return;
}
try {
if (state == STOPPING) {
LOG.info("Already stopped");
return;
}
LOG.info("Stopping services");
state = STOPPING;
eventBus.broadcast(new LifecycleEvent(STOPPING));

41
bramble-core/src/test/java/org/briarproject/bramble/lifecycle/LifecycleManagerImplTest.java
View File

@@ -9,12 +9,16 @@ import org.briarproject.bramble.api.lifecycle.event.LifecycleEvent;
import org.briarproject.bramble.api.system.Clock;
import org.briarproject.bramble.test.BrambleMockTestCase;
import org.briarproject.bramble.test.DbExpectations;
import org.jmock.Expectations;
import org.junit.Before;
import org.junit.Test;
import java.util.concurrent.atomic.AtomicBoolean;
import static junit.framework.TestCase.assertTrue;
import static org.briarproject.bramble.api.lifecycle.LifecycleManager.LifecycleState.RUNNING;
import static org.briarproject.bramble.api.lifecycle.LifecycleManager.LifecycleState.STARTING;
import static org.briarproject.bramble.api.lifecycle.LifecycleManager.LifecycleState.STOPPING;
import static org.briarproject.bramble.api.lifecycle.LifecycleManager.StartResult.CLOCK_ERROR;
import static org.briarproject.bramble.api.lifecycle.LifecycleManager.StartResult.SUCCESS;
import static org.briarproject.bramble.api.system.Clock.MAX_REASONABLE_TIME_MS;
@@ -57,6 +61,7 @@ public class LifecycleManagerImplTest extends BrambleMockTestCase {
lifecycleManager.registerOpenDatabaseHook(hook);
assertEquals(SUCCESS, lifecycleManager.startServices(dbKey));
assertEquals(RUNNING, lifecycleManager.getLifecycleState());
assertTrue(called.get());
}
@@ -69,6 +74,7 @@ public class LifecycleManagerImplTest extends BrambleMockTestCase {
}});
assertEquals(CLOCK_ERROR, lifecycleManager.startServices(dbKey));
assertEquals(STARTING, lifecycleManager.getLifecycleState());
}
@Test
@@ -80,5 +86,40 @@ public class LifecycleManagerImplTest extends BrambleMockTestCase {
}});
assertEquals(CLOCK_ERROR, lifecycleManager.startServices(dbKey));
assertEquals(STARTING, lifecycleManager.getLifecycleState());
}
@Test
public void testSecondCallToStopServicesReturnsEarly() throws Exception {
long now = System.currentTimeMillis();
Transaction txn = new Transaction(null, false);
context.checking(new DbExpectations() {{
oneOf(clock).currentTimeMillis();
will(returnValue(now));
oneOf(db).open(dbKey, lifecycleManager);
will(returnValue(false));
oneOf(db).transaction(with(false), withDbRunnable(txn));
oneOf(db).removeTemporaryMessages(txn);
exactly(2).of(eventBus).broadcast(with(any(LifecycleEvent.class)));
}});
assertEquals(SUCCESS, lifecycleManager.startServices(dbKey));
assertEquals(RUNNING, lifecycleManager.getLifecycleState());
context.assertIsSatisfied();
context.checking(new Expectations() {{
oneOf(eventBus).broadcast(with(any(LifecycleEvent.class)));
oneOf(db).close();
}});
lifecycleManager.stopServices();
assertEquals(STOPPING, lifecycleManager.getLifecycleState());
context.assertIsSatisfied();
// Calling stopServices() again should not broadcast another event or
// try to close the DB again
lifecycleManager.stopServices();
assertEquals(STOPPING, lifecycleManager.getLifecycleState());
}
}