PersistentStorage class abstract interface

Interface for the persistent storage used to back the downloader

Defines 'store', 'retrieve', 'retrieveAll' and 'remove' methods for:

Each of the objects has a toJson method and can be created using fromJson (use .createFromJson for Task objects)

Also defined methods to allow migration from one database version to another





currentDatabaseVersion → (String, int)
Name and version number for this type of persistent storage
no setter
hashCode int
The hash code for this object.
no setterinherited
runtimeType Type
A representation of the runtime type of the object.
no setterinherited
storedDatabaseVersion Future<(String, int)>
Name and version number for database as stored
no setter


initialize() Future<void>
Initialize the database - only called when the BaseDownloader is created with this object, which happens when the FileDownloader singleton is instantiated, OR as part of a migration away from this database type.
noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
removePausedTask(String? taskId) Future<void>
Remove paused Task with taskId from storage. If null, remove all
removeResumeData(String? taskId) Future<void>
Remove ResumeData with taskId from storage. If null, remove all
removeTaskRecord(String? taskId) Future<void>
Remove TaskRecord with taskId from storage. If null, remove all
retrieveAllPausedTasks() Future<List<Task>>
Retrieve all paused Task
retrieveAllResumeData() Future<List<ResumeData>>
Retrieve all ResumeData
retrieveAllTaskRecords() Future<List<TaskRecord>>
Retrieve all TaskRecord
retrievePausedTask(String taskId) Future<Task?>
Retrieve paused Task with taskId, or null if not found
retrieveResumeData(String taskId) Future<ResumeData?>
Retrieve ResumeData with taskId, or null if not found
retrieveTaskRecord(String taskId) Future<TaskRecord?>
Retrieve TaskRecord with taskId, or null if not found
storePausedTask(Task task) Future<void>
Store a paused task, keyed by taskId
storeResumeData(ResumeData resumeData) Future<void>
Store ResumeData, keyed by its taskId
storeTaskRecord(TaskRecord record) Future<void>
Store a TaskRecord, keyed by taskId
toString() String
A string representation of this object.


operator ==(Object other) bool
The equality operator.