Effect

• Effect Days 2024 is an event taking place in Vienna, Austria
• The documentation for Effect Days includes examples and information on various topics related to the Effect programming language
• The code snippet is written in JavaScript
• The code snippet demonstrates the use of test layers and failure cases to simulate different scenarios
• The code snippet includes the creation and deletion of buckets, indexes, and entries in various services
• The code snippet shows how the operations can succeed or fail based on the specified failure case
• The documentation covers topics such as getting started, creating effects, error management, context management, observability, state management, concurrency, streaming, and more
• The software is developed by Effectful Technologies Inc.
• The dependency memoization logging system used is MIT and it was last updated on October 13, 2023.
• The console output will include the following messages: "Terminal [S3] creating bucket", "[ElasticSearch] creating index", "[S3] delete bucket <bucket.name>", and a failure with "left(new ElasticSearchError())".
• There is a rollback that deletes the S3 bucket if the ElasticSearch index creation fails.
• make is a function that combines the createBucket, createIndex, and createEntry functions to create a scoped effect
• createBucket is a function that creates a bucket and handles the acquired resource (bucket) after the main effect has completed
• FailureCase is a type that allows us to provide different error scenarios while testing the services
• S3Test is a test layer for the S3 service
• createEntry is a function that creates an entry in the database and handles the acquired resource (entry) after the main effect has completed
• createIndex is a function that creates an index and handles the acquired resource (index) after the main effect has completed
• When a scope is closed, the finalizers registered in that scope will execute immediately
• When using Effect.scoped, the scope is managed automatically and finalizers are executed accordingly
• The Scope.extend function allows you to extend the scope of an Effect workflow into another scope without closing the scope
• Finalizers run when the scope is closed, not necessarily when the effect finishes running
• Resources can be defined using operators like Effect.acquireRelease(acquire, release)
• To have more control over when each scope is closed, you can manually create and close them
• The scopes of task1 and task2 are merged into a single scope when the program is run
• When managing the scope manually, you have control over when finalizers are executed
• The call to close will only wait for the finalizers that have already been registered
• The Scope data type allows adding finalizers and closing the scope to release resources and execute finalizers.
• Effect.interrupt is used to create an effect that represents an interruption
• Resource management plays a critical role in developing long-lived applications.
• When a Scope is closed, the finalizers are executed in reverse order of addition.
• The Scope data type is fundamental for managing resources safely and in a composable manner in Effect.
• A scope represents the lifetime of one or more resources, and when closed, the associated resources are released.
• Effective resource management is indispensable for building large-scale applications.
• Resource leaks, such as unclosed socket connections, database connections, or file descriptors, are unacceptable in web applications.
• Combining Scope with the Effect context provides a powerful way to manage resources effectively.
• Effect offers robust constructs for resource management.
• Manually creating and closing scopes allows for more control over when each scope is closed
• The Effect.addFinalizer function adds finalizers to the scope of an Effect value
• The behavior of finalizers may depend on the Exit value with which the scope is closed
• Effect.gen is used to define a generator function for creating effects