Example usage for org.springframework.statemachine.guard Guard Guard

Introduction

In this page you can find the example usage for org.springframework.statemachine.guard Guard Guard.

Prototype

Guard

Source Link

Usage

From source file:org.springframework.statemachine.recipes.tasks.TasksHandler.java

/**
 * Tasks choice guard. This {@link Guard} will check if related
 * extended state variables contains negative values for related
 * tasks id's and returns true if so, else false.
 *
 * @return the guard//from  w w w.  java  2 s  .  c  om
 */
private Guard<String, String> tasksChoiceGuard() {
    return new Guard<String, String>() {

        @Override
        public boolean evaluate(StateContext<String, String> context) {
            Map<Object, Object> variables = context.getExtendedState().getVariables();
            for (Entry<Object, Object> entry : variables.entrySet()) {
                if (entry.getKey() instanceof String
                        && ((String) entry.getKey()).startsWith(STATE_TASKS_PREFIX)) {
                    if (entry.getValue() instanceof Integer) {
                        Integer value = (Integer) entry.getValue();
                        if (value < 0) {
                            if (log.isDebugEnabled()) {
                                log.debug("Task id=[" + entry.getKey()
                                        + "] has negative execution value, tasksChoiceGuard returns true");
                            }
                            listener.onTasksError();
                            return true;
                        }
                    }
                }
            }
            listener.onTasksSuccess();
            return false;
        }
    };
}

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