public String extractProperty(String name) {
        if (properties != null) {
            return properties.get(name);
        }
        return null;
    }
Returns the value of a given property

@param name Name of the property which needs to be extracted
@return value of the property as a string
modules/siddhi-core/src/main/java/io/siddhi/core/util/config/InMemoryConfigManager.java