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Documentation
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Index ¶
Constants ¶
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Variables ¶
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Functions ¶
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Types ¶
type CombinedBuffer ¶
type CombinedBuffer struct {
// contains filtered or unexported fields
}
CombinedBuffer is a two-tier buffer: in-memory ring for speed and file-backed buffer for durability and overflow. It implements hermod.Producer and can be consumed by the engine like other buffers.
Policy (simple/default):
- Produce tries ring first with a short timeout; on timeout or when ring is above spillHigh watermark, it appends to the file buffer.
- Consume drains ring first; when empty, it drains from the file buffer and forwards to the handler.
- Close signals both tiers; file buffer is responsible for persisting state.
func NewCombinedBuffer ¶
func NewCombinedBuffer(ringCapacity int, dir string, fileSize int, opts *CombinedOptions) (*CombinedBuffer, error)
NewCombinedBuffer constructs a CombinedBuffer. ringCapacity: size of in-memory ring channel. dir: directory for file buffer; created if missing. fileSize: logical size/backpressure window used by FileBuffer.
type CombinedOptions ¶
type CombinedOptions struct {
// SpillHighPct and SpillLowPct are percentages of ring capacity (0-100).
SpillHighPct int
SpillLowPct int
// ProduceTimeout bounds the time we wait to enqueue into the ring.
ProduceTimeout time.Duration
// Compressor is used for file-backed storage.
Compressor compression.Compressor
}
CombinedOptions holds optional tuning parameters for CombinedBuffer.
type FileBuffer ¶
type FileBuffer struct {
// contains filtered or unexported fields
}
FileBuffer is a persistent buffer that stores messages in an append-only log.
func NewFileBuffer ¶
func NewFileBuffer(dir string, size int) (*FileBuffer, error)
func NewFileBufferWithCompressor ¶
func NewFileBufferWithCompressor(dir string, size int, comp compression.Compressor) (*FileBuffer, error)
func (*FileBuffer) Close ¶
func (b *FileBuffer) Close() error
type RingBuffer ¶
type RingBuffer struct {
// contains filtered or unexported fields
}
RingBuffer is a high-performance, lock-free (using channels for now as a simple example, but optimized for performance) buffer that implements both Producer and Consumer.
func NewRingBuffer ¶
func NewRingBuffer(size int) *RingBuffer
func (*RingBuffer) Close ¶
func (b *RingBuffer) Close() error
func (*RingBuffer) Depth ¶
func (b *RingBuffer) Depth() (queued, capacity int)
Depth reports how many messages are waiting to be consumed and the buffer's capacity. A buffer holding messages that never drain is what a wedged pipeline looks like from the inside, and is the signal the stall watchdog uses to tell "stuck" apart from "idle".
Source Files