Examples with Futures.getThrowingException io.pravega.common.concurrent.Futures.getThrowingException used on opensource projects

Example 1 with Futures.getThrowingException

use of io.pravega.common.concurrent.Futures.getThrowingException in project pravega by pravega.

the class ReaderGroupImpl method resetReaderGroup.

@Override
public void resetReaderGroup(ReaderGroupConfig config) {
    log.info("Reset ReaderGroup {} to {}", getGroupName(), config);
    synchronizer.fetchUpdates();
    while (true) {
        val currentConfig = synchronizer.getState().getConfig();
        // We only move into the block if the state transition has happened successfully.
        if (stateTransition(currentConfig, new UpdatingConfig(true))) {
            if (currentConfig.getReaderGroupId() == ReaderGroupConfig.DEFAULT_UUID && currentConfig.getGeneration() == ReaderGroupConfig.DEFAULT_GENERATION) {
                // Migration code path, for moving a ReaderGroup from version < 0.9 to 0.9+
                final ReaderGroupConfig updateConfig = ReaderGroupConfig.cloneConfig(config, UUID.randomUUID(), 0L);
                final long nextGen = Futures.getThrowingException(controller.createReaderGroup(scope, getGroupName(), updateConfig).thenCompose(conf -> {
                    if (!conf.getReaderGroupId().equals(updateConfig.getReaderGroupId())) {
                        return controller.updateReaderGroup(scope, groupName, ReaderGroupConfig.cloneConfig(updateConfig, conf.getReaderGroupId(), conf.getGeneration()));
                    } else {
                        // ReaderGroup IDs matched so our create was updated on Controller
                        return CompletableFuture.completedFuture(conf.getGeneration());
                    }
                }));
                updateConfigInStateSynchronizer(updateConfig, nextGen);
            } else {
                // normal code path
                // Use the latest generation and reader group Id.
                ReaderGroupConfig newConfig = ReaderGroupConfig.cloneConfig(config, currentConfig.getReaderGroupId(), currentConfig.getGeneration());
                long newGen = Futures.exceptionallyExpecting(controller.updateReaderGroup(scope, groupName, newConfig), e -> Exceptions.unwrap(e) instanceof ReaderGroupConfigRejectedException, -1L).join();
                if (newGen == -1) {
                    log.debug("Synchronize reader group with the one present on controller.");
                    synchronizeReaderGroupConfig();
                    continue;
                }
                updateConfigInStateSynchronizer(newConfig, newGen);
            }
            return;
        }
    }
}