@Test public void shouldGenerateDatabasePanicEvents() { // GIVEN DatabasePanicEventGenerator generator = mock( DatabasePanicEventGenerator.class ); DatabaseHealth databaseHealth = new DatabaseHealth( generator, NullLogProvider.getInstance().getLog( DatabaseHealth.class ) ); databaseHealth.healed(); // WHEN Exception cause = new Exception( "My own fault" ); databaseHealth.panic( cause ); databaseHealth.panic( cause ); // THEN verify( generator, times( 1 ) ).generateEvent( TX_MANAGER_NOT_OK, cause ); }
@Test public void shouldLogDatabasePanicEvent() { // GIVEN AssertableLogProvider logProvider = new AssertableLogProvider(); DatabaseHealth databaseHealth = new DatabaseHealth( mock( DatabasePanicEventGenerator.class ), logProvider.getLog( DatabaseHealth.class ) ); databaseHealth.healed(); // WHEN String message = "Listen everybody... panic!"; Exception exception = new Exception( message ); databaseHealth.panic( exception ); // THEN logProvider.assertAtLeastOnce( inLog( DatabaseHealth.class ).error( is( "Database panic: The database has encountered a critical error, " + "and needs to be restarted. Please see database logs for more details." ), sameInstance( exception ) ) ); }
@Test public void databaseWithCriticalErrorsCanNotBeHealed() { AssertableLogProvider logProvider = new AssertableLogProvider(); DatabaseHealth databaseHealth = new DatabaseHealth( mock( DatabasePanicEventGenerator.class ), logProvider.getLog( DatabaseHealth.class ) ); assertTrue( databaseHealth.isHealthy() ); IOException criticalException = new IOException( "Space exception.", new OutOfMemoryError( "Out of memory." ) ); databaseHealth.panic( criticalException ); assertFalse( databaseHealth.isHealthy() ); assertFalse( databaseHealth.healed() ); logProvider.assertNoMessagesContaining( "Database health set to OK" ); logProvider.assertContainsLogCallContaining( "Database encountered a critical error and can't be healed. Restart required." ); } }
@Test public void healDatabaseWithoutCriticalErrors() { AssertableLogProvider logProvider = new AssertableLogProvider(); DatabaseHealth databaseHealth = new DatabaseHealth( mock( DatabasePanicEventGenerator.class ), logProvider.getLog( DatabaseHealth.class ) ); assertTrue( databaseHealth.isHealthy() ); databaseHealth.panic( new IOException( "Space exception." ) ); assertFalse( databaseHealth.isHealthy() ); assertTrue( databaseHealth.healed() ); logProvider.assertContainsLogCallContaining( "Database health set to OK" ); logProvider.assertNoMessagesContaining( "Database encountered a critical error and can't be healed. Restart required." ); }
databaseHealth.healed();
adversary.disable(); healthOf( db ).healed(); // heal the db so it is possible to inspect the data
databaseHealth.healed();