Struct Journal

pub struct Journal {
    pub id: i64,
    pub migration_type: i32,
    pub tables: Vec<String>,
    pub local_position: String,
    pub shard_gtids: Vec<ShardGtid>,
    pub participants: Vec<KeyspaceShard>,
    pub source_workflows: Vec<String>,
}

Journal contains the metadata for a journal event. The commit of a journal event indicates the point of no return for a migration.

Fields

id: i64

Id represents a unique journal id.

migration_type: i32

tables: Vec<String>

Tables is set if the journal represents a TABLES migration.

local_position: String

LocalPosition is the source position at which the migration happened.

shard_gtids: Vec<ShardGtid>

ShardGtids is the list of targets to which the migration took place.

participants: Vec<KeyspaceShard>

Participants is the list of source participants for a migration. Every participant is expected to have an identical journal entry. While streaming, the client must wait for the journal entry to be received from all pariticipants, and then replace them with new streams specified by ShardGtid. If a stream does not have all participants, a consistent migration is not possible.

source_workflows: Vec<String>

SourceWorkflows is the list of workflows in the source shard that were migrated to the target. If a migration fails after a Journal is committed, this information is used to start the target streams that were created prior to the creation of the journal.

Implementations

impl Journal

pub fn migration_type(&self) -> MigrationType

Returns the enum value of migration_type, or the default if the field is set to an invalid enum value.

pub fn set_migration_type(&mut self, value: MigrationType)

Sets migration_type to the provided enum value.

Trait Implementations

impl Clone for Journal

fn clone(&self) -> Journal

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Journal

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

Formats the value using the given formatter.

impl Default for Journal

fn default() -> Self

Returns the “default value” for a type.

impl Message for Journal

fn encoded_len(&self) -> usize

Returns the encoded length of the message without a length delimiter.

fn clear(&mut self)

Clears the message, resetting all fields to their default.

fn encode<B>(&self, buf: &mut B) -> Result<(), EncodeError>

where B: BufMut, Self: Sized,

Encodes the message to a buffer.

fn encode_to_vec(&self) -> Vec<u8>

where Self: Sized,

Encodes the message to a newly allocated buffer.

fn encode_length_delimited<B>(&self, buf: &mut B) -> Result<(), EncodeError>

where B: BufMut, Self: Sized,

Encodes the message with a length-delimiter to a buffer.

fn encode_length_delimited_to_vec(&self) -> Vec<u8>

where Self: Sized,

Encodes the message with a length-delimiter to a newly allocated buffer.

fn decode<B>(buf: B) -> Result<Self, DecodeError>

where B: Buf, Self: Default,

Decodes an instance of the message from a buffer.

fn decode_length_delimited<B>(buf: B) -> Result<Self, DecodeError>

where B: Buf, Self: Default,

Decodes a length-delimited instance of the message from the buffer.

fn merge<B>(&mut self, buf: B) -> Result<(), DecodeError>

where B: Buf, Self: Sized,

Decodes an instance of the message from a buffer, and merges it into self.

fn merge_length_delimited<B>(&mut self, buf: B) -> Result<(), DecodeError>

where B: Buf, Self: Sized,

Decodes a length-delimited instance of the message from buffer, and merges it into self.

impl PartialEq for Journal

fn eq(&self, other: &Journal) -> 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 StructuralPartialEq for Journal