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110 lines
3.7 KiB
Markdown
110 lines
3.7 KiB
Markdown
---
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layout: developer-doc
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title: Execution Server Flow
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category: runtime
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tags: [runtime, execution, language-server]
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order: 6
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---
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# Execution Server Flow
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This document describes the API and workflow of the internal execution server.
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<!-- MarkdownTOC levels="2,3" autolink="true" -->
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- [Opening a Connection](#opening-a-connection)
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- [API](#api)
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- [Internal Architecture](#internal-architecture)
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- [Job Queue](#job-queue)
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- [Job Types](#job-types)
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- [Scheduling Rules](#scheduling-rules)
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- [API Methods to Jobs Translation](#api-methods-to-jobs-translation)
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<!-- /MarkdownTOC -->
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## Opening a Connection
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> The actionables for this section are:
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>
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> 1. describe the `org.graalvm.polyglot.Context.Builder.serverTransport`
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> workflow of connecting to the server.
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## API
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> The actionables for this section are:
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>
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> 1. Document the server's API.
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## Internal Architecture
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This section describes certain implementation details of the execution server,
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allowing it to perform its operations safely and interactively.
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### Job Queue
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The execution server uses a job queue containing requests to be performed. An
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API method may queue multiple jobs.
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### Job Types
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There are a number of job types used internally for handling different
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scenarios:
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#### `EnsureCompiled`
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Takes a set of module names that must be compiled and ensures that the
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corresponding modules are compiled in the newest version. It also performs cache
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invalidations on changes since the last batch. Caches should be invalidated for
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all contexts affected by this recompilation. This operation is idempotent and
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should be run before any `Execute` action. This operation is not currently
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interruptible, but may become so in the future.
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#### `Execute`
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Takes a context ID and an optional set of expression IDs that should be
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executed. and executes the Enso code corresponding to the context's stack.
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Updates caches and sends updates to the users.
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This operation is interruptible through `Thread.interrupt()`.
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### Scheduling Rules
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1. `EnsureCompiled` jobs must be run sequentially (i.e. no other state
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modifications or executions are allowed during this job's run).
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2. `Execute` jobs may be run in parallel with each other (but not with
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`EnsureCompiled` jobs).
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3. `EnsureCompiled` jobs may be collapsed into one, by unifying their module
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sets.
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4. `Execute` jobs with the same `contextId` may be collapsed into one, by
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merging their `expression IDs` sets.
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5. All enqueued `EnsureCompiled` jobs should run before any `Execute` jobs.
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6. The order of `EnsureCompiled` jobs can be freely changed by the compiler.
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### API Methods to Jobs Translation
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The following describes handling of API messages through job queue
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modifications.
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1. EditFile:
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1. Abort and/or dequeue all pending and running messages (if possible).
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2. Synchronously perform all code updates.
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3. Enqueue an `EnsureCompiled` with all affected files.
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4. Enqueue an `Execute` for each existing context.
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2. Stack Modifications and Recomputes:
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1. Abort and/or dequeue all pending and running requests relevant to the
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affected context.
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2. Synchronously perform all state updates.
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3. Respond to the user.
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4. Enqueue EnsureCompiled for the file at the bottom of the affected
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context's stack.
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5. Enqueue Execute for the affected context.
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3. Visualization modifications:
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1. Synchronously perform all state updates.
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2. Respond to the user.
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3. Enqueue `EnsureCompiled` and `Execute` for the affected context. Set the
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minimal set of expressions required to compute to
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`Set(visualizedExpression)` in the `Execute` command.
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4. Create/Destroy context:
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1. Abort any jobs concerning the affected context.
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2. Perform state updates / cleanups. No jobs to schedule.
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