Examples of com.codebullets.sagalib.Saga

com.codebullets.sagalib.Saga
Represents a single saga. A saga contains state and handles different messages and events. @param < SAGA_STATE> Type of the saga state persisted between message handling.

    public Collection<SagaInstanceDescription> create(final Object message) {
        Collection<SagaInstanceDescription> sagaInstances = new ArrayList<>();


        for (SagaType sagaType : organizer.sagaTypesForMessage(message)) {
            if (sagaType.isStartingNewSaga()) {
                Saga newSaga = startNewSaga(sagaType.getSagaClass());
                sagaInstances.add(SagaInstanceDescription.define(newSaga, true));
            } else {
                Collection<Saga> sagas = continueExistingSaga(sagaType, message);
                for (Saga saga : sagas) {
                    sagaInstances.add(SagaInstanceDescription.define(saga, false));

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        Collection<Saga> sagas = new ArrayList<>();


        String sagaId = sagaType.getSagaId();
        if (sagaId != null) {
            // saga id is known -> we can create saga directly from know state.
            Saga saga = createSagaBasedOnId(sagaType, message);
            sagas.add(saga);
        } else {
            // no saga id available, search for existing state based on instance key.
            Collection<Saga> existingSagas = continueSagas(sagaType);
            sagas.addAll(existingSagas);

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        return sagas;
    }


    private Saga createSagaBasedOnId(final SagaType sagaType, final Object message) {
        Saga sagaToContinue = null;


        // saga id is known -> we can create saga directly from know state.
        SagaState state = stateStorage.load(sagaType.getSagaId());
        if (state != null) {
            sagaToContinue = continueSaga(state.getType(), state);

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    private Collection<Saga> continueSagas(final SagaType sagaType) {
        Collection<Saga> sagas = new ArrayList<>();


        Collection<? extends SagaState> sagaStates = stateStorage.load(sagaType.getSagaClass().getName(), sagaType.getInstanceKey());
        for (SagaState sagaState : sagaStates) {
            Saga saga = continueSaga(sagaType.getSagaClass(), sagaState);
            if (saga != null) {
                sagas.add(saga);
            }
        }

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    /**
     * Creates a new saga instance and attaches the existing saga state.
     */
    private Saga continueSaga(final Class<? extends Saga> sagaToContinue, final SagaState existingSate) {
        Saga saga;


        try {
            saga = createNewSagaInstance(sagaToContinue);
            saga.setState(existingSate);
        } catch (Exception ex) {
            saga = null;
            LOG.error("Unable to create new instance of saga type {}.", sagaToContinue, ex);
        }

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    /**
     * Create a new saga instance based on fully qualified name and the existing saga state.
     */
    private Saga continueSaga(final String sagaToContinue, final SagaState existingState) {
        Saga saga = null;


        try {
            Class clazz = Class.forName(sagaToContinue);
            saga = continueSaga(clazz, existingState);
        } catch (Exception ex) {

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    /**
     * Starts a new saga by creating an instance and attaching a new saga state.
     */
    private Saga startNewSaga(final Class<? extends Saga> sagaToStart) {
        Saga createdSaga = null;


        try {
            createdSaga = createNewSagaInstance(sagaToStart);
            createdSaga.createNewState();


            SagaState newState = createdSaga.state();
            newState.setSagaId(UUID.randomUUID().toString());
            newState.setType(sagaToStart.getName());
        } catch (Exception ex) {
            LOG.error("Unable to create new instance of saga type {}.", sagaToStart, ex);
        }

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     * Creates a new saga instances with the requested type.
     * @throws Exception Forwards possible exceptions from the provider get method.
     */
    private Saga createNewSagaInstance(final Class<? extends Saga> sagaType) throws Exception {
        Provider<? extends Saga> sagaProvider = providers.get(sagaType);
        Saga createdSaga = sagaProvider.get();
        if (createdSaga instanceof NeedTimeouts) {
            ((NeedTimeouts) createdSaga).setTimeoutManager(timeoutManager);
        }


        return createdSaga;

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    /**
     * Search for a reader based on saga type.
     */
    private Collection<KeyReader> findReader(final Class<? extends Saga> sagaClazz, final Class<?> messageClazz) {
        Saga saga = sagaProviderFactory.createProvider(sagaClazz).get();
        Collection<KeyReader> readers = saga.keyReaders();
        if (readers == null) {
            // return empty list in case saga returns null for any reason
            readers = new ArrayList<>();
        }

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        String key = keyExtractor.findSagaInstanceKey(sagaToContinue, message);
        if (key != null) {
            Collection<? extends SagaState> sagaStates = stateStorage.load(sagaToContinue.getName(), key);
            for (SagaState sagaState : sagaStates) {
                Saga saga = continueSaga(sagaToContinue, sagaState);
                if (saga != null) {
                    sagas.add(saga);
                }
            }
        } else {

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Related Classes of com.codebullets.sagalib.Saga

com.codebullets.sagalib.processing.SagaExecutionTask

com.codebullets.sagalib.processing.SagaFactory

com.codebullets.sagalib.processing.SagaKeyReaderExtractor

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