Struct design_pattern_examples_rust::flyweight::flyweight_bigresource_manager::BigResourceManager

pub struct BigResourceManager {
    resources: Vec<BigResource>,
}

Represents a list of instances of the BigResource struct. Use the add_resource() method to add a BigResource instance to the list (and also take ownership of the BigResource instance). Call get_resource() with the ID of the resource to get the BigResource instance.

Fields

resources: Vec<BigResource>

Implementations

impl BigResourceManager

pub fn new() -> BigResourceManager

Constructor.

Returns

Returns a new instance of the BigResourceManager struct.

pub fn add_resource(&mut self, resource: BigResource) -> usize

Add a BigResource object to the list of big resources. The list takes ownership of the BigResource object.

Parameters

• resource

  The BigResource to store in the manager.

Returns

Returns the “id” of the resource so it can be used to access the resource later on. Technically, the ID is actually the index where the BigResource instance appears in the internal list.

pub fn get_resource(&self, resource_id: usize) -> Option<&BigResource>

Retrieve the requested big resource.

Parameters

• resource_id

  The ID of the resource to retrieve.

Returns

Returns Some(&BigResource) if the resource exists; otherwise, returns None.