Struct LevelDependency

pub struct LevelDependency {
    pub dependency_type: DependencyType,
    pub dependent_level: u8,
    pub requires_token: Event,
    pub requires_level_by_preference: Vec<u8>,
}

Describes a dependency from one power element’s level on another power element’s level. For example if element PowerElement_A has a level PowerLevel_A3 which depends on an element PowerElement_B being at PowerLevel_B2 where the dependency is DependencyType::ASSERTIVE then we would fill out the struct to convey the meaning:

• dependent_level = PowerLevel_A3
• requires_token = PowerElement_B,
• dependency_type = ASSERTIVE`,
• requires_level_by_preference = [PowerLevel_B2] (Note the values above are only symbolic, eg. dependent_level requires an integer value, not a string.)

The dependent Element’s identity is not specified in this struct and must be specified as a separate argument in a request or be inferred, perhaps because a channel is scoped to the dependent element.

Fields

dependency_type: DependencyType

Must match the expected type of the DependencyToken, i.e. ASSERTIVE must be used if the token is specified to be an assertive dependency token and OPPORTUNISTIC must be used if the token is specified to be an opportunistic dependency token.

dependent_level: u8

The power element level that this LevelDependency struct declaration supports. This is level that has a dependency on requires_level_by_preference.

requires_token: Event

Must supply a token registered via the RegisterDependencyToken call of the required element’s ElementControl protocol.

requires_level_by_preference: Vec<u8>

A list of levels in decreasing preferential order that power broker should attempt to make required for this dependency to be satisfied. The first level in list that is a valid level will become the required level.

Platform clients can use this list to keep backwards compatibility with dependencies by providing multiple levels that the dependency may have implemented in older API levels.

Trait Implementations

impl Debug for LevelDependency

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Decode<LevelDependency, DefaultFuchsiaResourceDialect> for LevelDependency

fn new_empty() -> Self

Creates a valid instance of Self. The specific value does not matter, since it will be overwritten by decode.

unsafe fn decode( &mut self, decoder: &mut Decoder<'_, DefaultFuchsiaResourceDialect>, offset: usize, _depth: Depth, ) -> Result<()>

Decodes an object of type T from the decoder’s buffers into self.

impl Encode<LevelDependency, DefaultFuchsiaResourceDialect> for &mut LevelDependency

unsafe fn encode( self, encoder: &mut Encoder<'_, DefaultFuchsiaResourceDialect>, offset: usize, _depth: Depth, ) -> Result<()>

Encodes the object into the encoder’s buffers. Any handles stored in the object are swapped for Handle::INVALID.

impl<T0: Encode<DependencyType, DefaultFuchsiaResourceDialect>, T1: Encode<u8, DefaultFuchsiaResourceDialect>, T2: Encode<HandleType<Event, { _ }, 2147483648>, DefaultFuchsiaResourceDialect>, T3: Encode<Vector<u8, 256>, DefaultFuchsiaResourceDialect>> Encode<LevelDependency, DefaultFuchsiaResourceDialect> for (T0, T1, T2, T3)

unsafe fn encode( self, encoder: &mut Encoder<'_, DefaultFuchsiaResourceDialect>, offset: usize, depth: Depth, ) -> Result<()>

Encodes the object into the encoder’s buffers. Any handles stored in the object are swapped for Handle::INVALID.

impl Hash for LevelDependency

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl Ord for LevelDependency

fn cmp(&self, other: &LevelDependency) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl PartialEq for LevelDependency

fn eq(&self, other: &LevelDependency) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl PartialOrd for LevelDependency

fn partial_cmp(&self, other: &LevelDependency) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Rhs) -> bool

Tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Rhs) -> bool

Tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Rhs) -> bool

Tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Rhs) -> bool

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl ResourceTypeMarker for LevelDependency

type Borrowed<'a> = &'a mut LevelDependency

The Rust type to use for encoding. This is a particular Encode<Self> type cheaply obtainable from &mut Self::Owned. There are three cases:

fn take_or_borrow<'a>( value: &'a mut <Self as TypeMarker>::Owned, ) -> Self::Borrowed<'a>

Cheaply converts from &mut Self::Owned to Self::Borrowed. For HandleBased types this is “take” (it returns an owned handle and replaces value with Handle::invalid), and for all other types it is “borrow” (just converts from one reference to another).

impl TypeMarker for LevelDependency

type Owned = LevelDependency

The owned Rust type which this FIDL type decodes into.

fn inline_align(_context: Context) -> usize

Returns the minimum required alignment of the inline portion of the encoded object. It must be a (nonzero) power of two.

fn inline_size(_context: Context) -> usize

Returns the size of the inline portion of the encoded object, including padding for alignment. Must be a multiple of inline_align.

fn encode_is_copy() -> bool

Returns true if the memory layout of Self::Owned matches the FIDL wire format and encoding requires no validation. When true, we can optimize encoding arrays and vectors of Self::Owned to a single memcpy.

fn decode_is_copy() -> bool

Returns true if the memory layout of Self::Owned matches the FIDL wire format and decoding requires no validation. When true, we can optimize decoding arrays and vectors of Self::Owned to a single memcpy.

impl Eq for LevelDependency

impl Standalone<DefaultFuchsiaResourceDialect> for LevelDependency

impl StructuralPartialEq for LevelDependency