How deeply does Elixir in Action, Third Edition cover one_for_one strategy?

Explains configuration, replacement semantics, failure isolation, and synchronous startup, while deferring alternative strategies.

One_for_one strategy

As explained in Elixir in Action, Third Edition

A one-for-one supervisor is a supervisor that restarts a failed child independently without restarting its sibling children.

A one-for-one supervisor replaces only the child process that terminates. Sibling children continue running, limiting a failure’s impact to one supervised worker. section 8.3.2 section 9.1.1

Configure the strategy with Supervisor.start_link/2. The supervisor starts children in specification order, waits for each to finish starting, and then monitors the next. A replacement is a new process with a different PID and no shared state. section 8.3.2 section 9.1.1

Separating a database and cache

A system supervisor can start Todo.Database and Todo.Cache with strategy: :one_for_one. Killing the database server restarts database-related processes without restarting the cache; killing the cache similarly leaves the database running. section 9.1.1

How Elixir in Action, Third Edition covers it

Cover of Elixir in Action, Third Edition

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Related concepts

restart strategykind of · A restart strategy specifies how a supervisor handles failed child processes, including which children are terminated and restarted.
Supervisorkind of · A supervisor is a component that monitors subordinate processes or resources and takes configured recovery actions when they fail.
process-level isolationaddressed by · Process-level isolation is the separation of processes’ execution environments and resources to limit their ability to interfere with or access one another.

This explainer was generated by Manning's knowledge graph from the text of Elixir in Action, Third Edition. The section links point to the parts of the book it draws on.