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Stream Tee Duplication

A stream operation that forwards each accepted item to at least two branch interfaces without partitioning the input sequence.

Version
v1 · 2026-10-17 · History
Domain-specific #
14317
Domain group
Applied Sciences & Engineering
Origin domain
Computer Science & Software Engineering
Subdomain
Stream and Pipeline Processing → Computer Science & Software Engineering

Core Idea

Stream tee duplication offers each accepted stream item, with the same content, at two or more branch interfaces during ordinary successful operation. GNU tee sends bytes to a file and standard output; GStreamer's tee sends media flow to requested source pads. Later consumers may produce different outputs; a checksum or visualization is downstream of the tee handoff.[ref-f793bbb8aa52][ref-2bcbd0cc8354]

Scope of Application

Two documented constructions show the operation:

  • GNU byte pipeline: downloaded bytes reach dvd.iso and standard output before downstream cksum.[^ref-f793bbb8aa52]
  • GStreamer media pipeline: decoded song.ogg reaches queued audio and visualization branches.[^ref-2bcbd0cc8354]

These are documented examples, not observed deployments. Python's pull-style iterator tee supplies a shared-storage contrast.[^ref-63608d21f9ac]

Clarity

Sameness holds at the handoff, not after branch-specific work. Sending odd and even items to different paths partitions the stream; separate interfaces prove neither deep copying nor independent progress or delivery after failure.[ref-f793bbb8aa52][ref-2bcbd0cc8354][^ref-63608d21f9ac]

Manages Complexity

Trace the upstream sequence, tee point and branch interfaces before consumers. This separates forwarding from cksum, playback or visualization, and the common relation from GNU's error policy or GStreamer's queues. A blocked branch can affect progress without redefining successful fan-out.[ref-f793bbb8aa52][ref-2bcbd0cc8354]

Abstract Reasoning

Use boundary placement, invariant testing and countermodels: locate the handoff, test same-content availability at every branch, then compare partitioning or downstream transformation. Branch count alone is insufficient. Mapping one input sequence to several branch sequences is an analytical summary, not a manual's formula.[ref-f793bbb8aa52][ref-2bcbd0cc8354]

Knowledge Transfer

The operation transfers literally between GNU byte pipes and GStreamer media pads: both preserve item content at multiple branch boundaries. Python provides a pull-based comparison, without exporting its storage or thread-safety limits.[ref-f793bbb8aa52][ref-2bcbd0cc8354][^ref-63608d21f9ac] The broader Transformation maps input to altered output under a rule while preserving a declared invariant; other transformations need not tee. A branching picture without stream handoff does not establish this named operation.

Relationships to Other Abstractions

Local relationship map for Stream Tee DuplicationParents appear above the current abstraction, mutual partners to the right, and children below. Node labels state whether each abstraction is prime or domain-specific; colors identify relation types.Stream TeeDuplicationDOMAINPrime abstraction: Transformation — is a kind ofTransformationPRIME

Current abstraction Stream Tee Duplication Domain-specific

Parents (1) — more general patterns this builds on

  • Stream Tee Duplication is a kind of Transformation Prime

    A tee restructures one stream into a two-or-more-interface output under a forwarding rule while preserving each accepted item's content at the branch boundaries.

Hierarchy path (1) — routes to 1 parentless root

Neighborhood in Abstraction Space

Stream Tee Duplication sits in a sparse region of the domain-specific corpus (64th percentile for distinctiveness): few abstractions share its structure, so a faithful description tends to retrieve it precisely.

Family — Program Execution & Runtime Concepts (34 abstractions)

Nearest neighbors

Computed from structural-signature embeddings · 2026-10-17

References

[^ref-f793bbb8aa52]: GNU Project, GNU Coreutils Manual, release 9.11, section tee: Redirect output to multiple files or processes, @node tee invocation, definition at source lines 12684–12705, -p/--output-error modes at lines 12718–12747, and wget/dvd.iso/cksum worked construction at lines 12789–12795, official commit-pinned source. The inspected full source is tied to the official v9.11 release; the worked construction is documented, not an observed deployment. [^ref-2bcbd0cc8354]: GStreamer project, gsttee.c, GStreamer release 1.28.8, tee coreelements source documentation, split, queue/multiqueue caveat and constructed song.ogg audio/goom launch line at source lines 23–43, sink pad at lines 56–59 and requestable src_%u pad at lines 98–101, official release-tagged source. The official 1.28.8 release identifies this source edition; the launch line is a documented construction, not a measured deployment. [^ref-63608d21f9ac]: Python Software Foundation, itertools.tee (Python 3.15.0 documentation), itertools — Functions creating iterators for efficient looping, inspected official rendered edition, itertools.tee(iterable, n=2) definition, equivalent _tee sketch and following thread-safety/storage cautions, versioned rendered page. The official v3.15.0 release identifies the inspected edition; the /3.15/ page may later display a maintenance version. This is a supporting implementation contrast.