Examples with DynamicVariable org.opennms.mock.snmp.responder.DynamicVariable used on opensource projects

Example 1 with DynamicVariable

use of org.opennms.mock.snmp.responder.DynamicVariable in project opennms by OpenNMS.

the class PropertiesBackedManagedObject method handleDynamicVariable.

/**
 * <p>handleDynamicVariable</p>
 *
 * @param oidStr a {@link java.lang.String} object.
 * @param typeStr a {@link java.lang.String} object.
 * @return a {@link org.snmp4j.smi.Variable} object.
 * @throws SnmpErrorStatusException
 */
protected Variable handleDynamicVariable(String oidStr, String typeStr) throws SnmpErrorStatusException {
    DynamicVariable responder = m_dynamicVariableCache.get(oidStr);
    if (responder != null) {
        return responder.getVariableForOID(oidStr);
    } else if (m_dynamicVariableCache.containsKey(oidStr)) {
        throw new IllegalArgumentException("Already failed to initialize the dynamic variable " + typeStr);
    }
    try {
        // Create a new instance of the class in typeStr
        final Class<? extends DynamicVariable> dv = Class.forName(typeStr).asSubclass(DynamicVariable.class);
        if (!DynamicVariable.class.isAssignableFrom(dv)) {
            throw new IllegalArgumentException(typeStr + " must implement the DynamicVariable interface");
        }
        // Attempt to instantiate the object using the singleton pattern
        try {
            Method method = dv.getMethod("getInstance", new Class[0]);
            responder = (DynamicVariable) method.invoke(dv, new Object[0]);
        } catch (NoSuchMethodException e) {
        // Do nothing
        }
        // If the singleton initialization failed, then create a new instance
        if (responder == null) {
            responder = (DynamicVariable) dv.newInstance();
        }
    } catch (IllegalArgumentException e) {
        throw e;
    } catch (Throwable t) {
        throw new IllegalArgumentException("Failed to marshall " + typeStr);
    } finally {
        // Cache the result - good or bad
        m_dynamicVariableCache.put(oidStr, responder);
    }
    return responder.getVariableForOID(oidStr);
}