Android library that manages your app's cached data with ease.

Last update: Apr 2, 2022

Overview

Teller

Android library that makes your apps faster.

Teller facilitates the downloading, saving, and reading of the cached data of your app. Keep your user's data fresh and remove those annoying loading screens!

Read the official announcement of Teller to learn more about what it does and why to use it.

iOS developer? Check out the iOS version of Teller.

Announcement - version 1.0

Version 1.0 has been announced and is in development. Check out the issue to learn more. The pre-1.0 code will be in maintenance mode until v1.0 is complete. Pre-1.0 is used by myself in production apps today, but you have been warned that there will more then likely be large breaking changes when 1.0 comes out.

What is Teller?

The data used in your mobile app: user profiles, a collection of photos, list of friends, etc. all have state. Your data is in 1 of many different states:

Being fetched for the first time (if it comes from an async network call).
Data has been fetched before.
Data has been fetched before, but is empty.
Data has been fetched before but it's too old. It should be updated to show the user fresh data in the app.

Determining what state your data is in, keeping it up-to-date, and displaying this information to the user in the UI is a big pain. That is where Teller comes in. All you need to do is show Teller how your app's cached data is saved, queried, and fetched and Teller facilities everything else for you.

Teller will query your cached data, parse the cache to determine it's state, fetch fresh data if the cache is too old, and deliver the results to listeners so you can update the UI to your users.

Are you building an offline-first mobile app?

Teller is designed for developers building offline-first mobile apps. If you want to build fast apps without loading screens, check out another great Android library, Wendy-Android (there is an iOS version too). Wendy is designed to sync your device's cached data with a remote API. Think of it like this: Teller is really good at GET calls for your network API, Wendy is really good at PUT, POST, DELETE network API calls. Teller pulls data, Wendy pushes data.

Why use Teller?

The use of a cache in your Android app delivers a better app experience where you can...

Remove annoying loading screens from your app.
Not worry about your user having a spotty Internet connection.
Allow your users to complete tasks in your app, faster.
Teller has performance improvements built-in to save your user's battery life.

As app developers, we all understand that the fetching, saving, loading, and maintaining of cache data is a pain. When something is a pain to do, we often ignore that task and move on with building our app.

However, with Teller this pain goes away. By using Teller you will get the benefits of using a cache while not having to maintain that cache.

Here are some more benefits of Teller:

Small - The only dependency at this time is RxJava2 (this issue is working to make it optional)
Built in Kotlin, for Kotlin
Not opinionated. Use any storage method you wish
Paging just works
Full test suite, full documentation

What are you waiting for? Let's install Teller!

Documentation

The very detailed documentation for Teller can be found here. Go on, check them out!

Author

Levi Bostian - GitHub, Twitter, Website/blog

Contribute

Do you think Teller is cool? Want to help make it more cool? Great! We can use your help.

Open source isn't just writing code. Teller could use your help with any of the following:

Finding (and reporting!) bugs.
New feature suggestions.
Answering questions on issues.
Documentation improvements.
Reviewing pull requests.
Helping to manage issue priorities.
Fixing bugs/new features.

The Teller community is a very positive one, and the maintainers are committed to keeping things awesome. Like in over 230,000+ other communities, always assume positive intent; even if a comment sounds mean-spirited, give the person the benefit of the doubt.

Please note that this project is released with a Contributor Code of Conduct. By participating in this project you agree to abide by its terms.

Comments

Fix/improve the callbacks for DataState especially with errors.
Let's say you are observing (via rxjava) a DataState object in your UI of your Android app. You probably have code that looks something like this:

reposViewModel.observeRepos() .observe(this, Observer { reposState -> reposState?.deliver(object : OnlineDataStateListener<List<RepoModel>> { override fun firstFetchOfData() { // handle me } override fun isEmpty() { // handle me } override fun data(data: List<RepoModel>, fetched: Date) { // handle me } override fun error(error: Throwable) { // handle me } override fun fetchingFreshData() { // handle me } override fun finishedFetchingFreshData(errorDuringFetch: Throwable?) { // handle me } }) })

Here is the current state of this code as of this commit:

This code above does work as expected (all callbacks are called as you want them to. Callbacks get called when changes happen. It's dependable) but only on one condition: For the error state, you are showing the user the error message of the error using something like a dialog. An independent UI that is not shared between any of the other states.

That last part is very important and it explains the issue here. As long as you are handling the error in an independent UI, you will not see a problem in your app's code. This code above works and it works well.

However, what if you want to share a UI with all of the states of your data? What if you have a textview in your UI that will say, "Empty. No data here.", "Loading data for the first time", "You have an error", "Here is your data". This seems like a reasonable thing you may want to do. With the current state of this library, you cannot do this in a dependable way. Why? Because when an error occurs in an OnlineRepository subclass and there is an error that happens (tested in the fetch function) such as a 404 or something like that and you return a FetchResponse.fail() result for the fetch, error() will be called in the code pasted above, but empty() will also be called immediately after. So if you want to share a UI with all of the states of your data, you will show a message "You have an error" and then a split second later you will switch to "Empty. No data here."

I want to improve this API. I want you to be able to know the exact state of your data and your UI can depend on Teller giving it the data it needs to show the state of that data to your user. It needs to be more dependable and not have any rules like I do here by saying error() needs to be handled in it's own UI.

I believe to have this happen, I cannot simply edit the implementation of OnlineRepository. I believe it will take a refactor of the DataState deliver function as well. Perhaps a brand new set of callbacks, a brand new API to receive callbacks, I am not sure. Below I will share ideas and progress on this.
opened by levibostian 4
Include sources in aar relase package
I want to package the source code .jar with the Teller package so that users of the library can browse the source inside of Android Studio.

After some research, I am still not quite sure how to do this. However, from this SO question, I have an idea of the configuration to use. I have used this configuration in the past before, but I had no luck. I believe that is because of one of the comments someone mentioned, "it works for tagged releases for us". I did not tag a release.

In the teller/build.gradle file, include this code at the base of the file:

task sourcesJar(type: Jar, dependsOn: classes) { classifier = 'sources' from sourceSets.main.allSource } task javadocJar(type: Jar, dependsOn: javadoc) { classifier = 'javadoc' from javadoc.destinationDir } artifacts { archives sourcesJar archives javadocJar }

I learned, also from that SO question, on how to view the directory of built artifacts for JitPack. Go to this link and it shows all the index of the tagged releases for that project. Append a tagged release to the URL of the browser to view the contents of that release. You will notice for 0.0.1 release of Teller, you do not see a -sources.jar resource.
opened by levibostian 2
Allow repository to have a null data requirement.

Sometimes repositories don't need parameters to fetch data.Allow null.

Also, when repository loads, check if load data requirements data type is null and if so, begin observing data right away.

opened by levibostian 2

Make sure some functions run on the background thread.

I was creating integration tests the other day and when I tried to test observe() in an OnlineRepository subclass of mine, I was having a lot of exceptions.

Here is a gist of my test:

    @Test
    fun observeCachedData_data() {
        val foo = listOf(
                FooModel(id = 1)
        )
        insertFoo(foo)

        val body = GetFooResponse("", listOf())
        val result = Result.response(Response.success(body))
        `when`(service.getFoo(null)).thenReturn(
                Single.just(result).subscribeOn(Schedulers.io()) // Run on background thread as a DB save is triggered.
        )
        `when`(responseProcessor.process(result)).thenReturn(ResponseProcessor.ProcessedResult<GetFooResponse>(null, "", body))

        repository.loadDataRequirements = FooRepository.GetRequirements(null)
        repository.observe()
                .subscribeOn(Schedulers.io())
                .test()
                .awaitDone(500, TimeUnit.MILLISECONDS)
                .assertValue {
                    it.data!!.size == 1
                }
    }

Looking above, I was able to fix my test with the line: Single.just(result).subscribeOn(Schedulers.io()) // Run on background thread as a DB save is triggered. from my mock. I had to make sure that fetchFreshData() was called on a background thread. Why? Because in the OnlineRepository source code I notice that the thread that is subscribed on in fetchFreshData() determines what thread saveData() is called on.

This is not right. A subclass of OnlineRepository should always know what thread something is executed on.

enhancement

opened by levibostian 2

Improved delivery of `DataState` to the UI.

Right now, if you want to parse the DataState object so that you can easily get the status of your data and show it in the UI, it is somewhat messy and boilerplate. This is because of using all of the OnlineDataStateListener functions.

What if I have a custom view that only cares about the fetching? What if I have a fragment that only cares about the errors? What if I have a RecyclerView that only cares about the empty data or not empty data?

I don't have many ideas at this time, but I do want to improve the API for DataState.

opened by levibostian 2
Bump prismjs from 1.21.0 to 1.25.0
Bumps prismjs from 1.21.0 to 1.25.0.

Release notes

Sourced from prismjs's releases.

v1.25.0

Release 1.25.0

v1.24.1

Release 1.24.1

v1.24.0

Release 1.24.0

v1.23.0

Release 1.23.0

v1.22.0

Release 1.22.0

Changelog

Sourced from prismjs's changelog.

1.25.0 (2021-09-16)

New components

AviSynth (#3071) 746a4b1a

Avro IDL (#3051) 87e5a376

Bicep (#3027) c1dce998

GAP (CAS) (#3054) 23cd9b65

GN (#3062) 4f97b82b

Hoon (#2978) ea776756

Kusto (#3068) e008ea05

Magma (CAS) (#3055) a1b67ce3

MAXScript (#3060) 4fbdd2f8

Mermaid (#3050) 148c1eca

Razor C# (#3064) 4433ccfc

Systemd configuration file (#3053) 8df825e0

Wren (#3063) 6a356d25

Updated components

Bicep

Added support for multiline and interpolated strings and other improvements (#3028) 748bb9ac

C#

Added with keyword & improved record support (#2993) fdd291c0

Added record, init, and nullable keyword (#2991) 9b561565

Added context check for from keyword (#2970) 158f25d4

C++

Fixed generic function false positive (#3043) 5de8947f

Clojure

Improved tokenization (#3056) 8d0b74b5

Hoon

Fixed mixed-case aura tokenization (#3002) 9c8911bd

Liquid

Added all objects from Shopify reference (#2998) 693b7433

Added empty keyword (#2997) fe3bc526

Log file

Added support for Java stack traces (#3003) b0365e70

Markup

Made most patterns greedy (#3065) 52e8cee9

Fixed ReDoS (#3078) 0ff371bb

PureScript

Made ∀ a keyword (alias for forall) (#3005) b38fc89a

Improved Haskell and PureScript (#3020) 679539ec

Python

Support for underscores in numbers (#3039) 6f5d68f7

Sass

Fixed issues with CSS Extras (#2994) 14fdfe32

Shell session

Fixed command false positives (#3048) 35b88fcf

Added support for the percent sign as shell symbol (#3010) 4492b62b

... (truncated)

Commits

99d94fa 1.25.0

6d8e547 Updated changelog (#3083)

e008ea0 Added support for Kusto (#3068)

4433ccf Added support for ASP.NET Razor (#3064)

6a356d2 Added support for Wren (#3063)

4fbdd2f Added support for MAXScript (#3060)

746a4b1 Added AviSynth language definition (#3071)

ffb2043 Twilight theme: Increase selector specificities of plugin overrides (#3081)

52e8cee Markup: Made most patterns greedy (#3065)

c7b6a7f Previewers: Ensure popup is visible across themes (#3080)

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dependencies javascript
opened by dependabot[bot] 1
Bump path-parse from 1.0.6 to 1.0.7
Bumps path-parse from 1.0.6 to 1.0.7.

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dependencies javascript
opened by dependabot[bot] 1
Bump addressable from 2.5.2 to 2.8.0
Bumps addressable from 2.5.2 to 2.8.0.

Changelog

Sourced from addressable's changelog.

Addressable 2.8.0

fixes ReDoS vulnerability in Addressable::Template#match

no longer replaces + with spaces in queries for non-http(s) schemes

fixed encoding ipv6 literals

the :compacted flag for normalized_query now dedupes parameters

fix broken escape_component alias

dropping support for Ruby 2.0 and 2.1

adding Ruby 3.0 compatibility for development tasks

drop support for rack-mount and remove Addressable::Template#generate

performance improvements

switch CI/CD to GitHub Actions

Addressable 2.7.0

added :compacted flag to normalized_query

heuristic_parse handles mailto: more intuitively

dropped explicit support for JRuby 9.0.5.0

compatibility w/ public_suffix 4.x

performance improvements

Addressable 2.6.0

added tld= method to allow assignment to the public suffix

most heuristic_parse patterns are now case-insensitive

heuristic_parse handles more file:// URI variations

fixes bug in heuristic_parse when uri starts with digit

fixes bug in request_uri= with query strings

fixes template issues with nil and ? operator

frozen_string_literal pragmas added

minor performance improvements in regexps

fixes to eliminate warnings

Commits

6469a23 Updating gemspec again

2433638 Merge branch 'main' of github.com:sporkmonger/addressable into main

e9c76b8 Merge pull request #378 from ashmaroli/flat-map

56c5cf7 Update the gemspec

c1fed1c Require a non-vulnerable rake

0d8a312 Adding note about ReDoS vulnerability

89c7613 Merge branch 'template-regexp' into main

cf8884f Note about alias fix

bb03f71 Merge pull request #371 from charleystran/add_missing_encode_component_doc_entry

6d1d809 Adding note about :compacted normalization

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dependencies ruby
opened by dependabot[bot] 1
Bump prismjs from 1.21.0 to 1.24.0
Bumps prismjs from 1.21.0 to 1.24.0.

Release notes

Sourced from prismjs's releases.

v1.24.0

Release 1.24.0

v1.23.0

Release 1.23.0

v1.22.0

Release 1.22.0

Changelog

Sourced from prismjs's changelog.

1.24.0 (2021-06-27)

New components

CFScript (#2771) b0a6ec85

ChaiScript (#2706) 3f7d7453

COBOL (#2800) 7e5f78ff

Coq (#2803) 41e25d3c

CSV (#2794) f9b69528

DOT (Graphviz) (#2690) 1f91868e

False (#2802) 99a21dc5

ICU Message Format (#2745) bf4e7ba9

Idris (#2755) e9314415

Jexl (#2764) 7e51b99c

KuMir (КуМир) (#2760) 3419fb77

Log file (#2796) 2bc6475b

Nevod (#2798) f84c49c5

OpenQasm (#2797) 1a2347a3

PATROL Scripting Language (#2739) 18c67b49

Q# (#2804) 1b63cd01

Rego (#2624) e38986f9

Squirrel (#2721) fd1081d2

URI (#2708) bbc77d19

V (#2687) 72962701

Wolfram language & Mathematica & Mathematica Notebook (#2921) c4f6b2cc

Updated components

Fixed problems reported by regexp/no-dupe-disjunctions (#2952) f471d2d7

Fixed some cases of quadratic worst-case runtime (#2922) 79d22182

Fixed 2 cases of exponential backtracking (#2774) d85e30da

AQL

Update for ArangoDB 3.8 (#2842) ea82478d

AutoHotkey

Improved tag pattern (#2920) fc2a3334

Bash

Accept hyphens in function names (#2832) e4ad22ad

Fixed single-quoted strings (#2792) e5cfdb4a

C++

Added support for generic functions and made :: punctuation (#2814) 3df62fd0

Added missing keywords and modules (#2763) 88fa72cf

Dart

Improved support for classes & generics (#2810) d0bcd074

Docker

Improvements (#2720) 93dd83c2

Elixir

Added missing keywords (#2958) 114e4626

Added missing keyword and other improvements (#2773) e6c0d298

Added defdelagate keyword and highlighting for function/module names (#2709) 59f725d7

F#

... (truncated)

Commits

3432b4b 1.24.0

46d0720 Updated .npmignore (#2971)

aef7f08 Changelog for v1.24.0 (#2965)

e9477d8 Markdown: Improved code snippets (#2967)

4b55bd6 Made Match Braces and Custom Class compatible (#2947)

e8d3b50 ESLint: Added regexp/strict rule (#2944)

bfd7fde GraphQL: Fixed definition-query and definition-mutation tokens (#2964)

14e3868 Fixed reST test

a7656de reST: Fixed inline pattern (#2946)

b4ac061 ESLint: Use cache (#2959)

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dependencies javascript
opened by dependabot[bot] 1
Bump hosted-git-info from 2.7.1 to 2.8.9
Bumps hosted-git-info from 2.7.1 to 2.8.9.

Changelog

Sourced from hosted-git-info's changelog.

2.8.9 (2021-04-07)

Bug Fixes

backport regex fix from #76 (29adfe5), closes #84

2.8.8 (2020-02-29)

Bug Fixes

#61 & #65 addressing issues w/ url.URL implmentation which regressed node 6 support (5038b18), closes #66

2.8.7 (2020-02-26)

Bug Fixes

Do not attempt to use url.URL when unavailable (2d0bb66), closes #61 #62

Do not pass scp-style URLs to the WhatWG url.URL (f2cdfcf), closes #60

2.8.6 (2020-02-25)

2.8.5 (2019-10-07)

Bug Fixes

updated pathmatch for gitlab (e8325b5), closes #51

updated pathmatch for gitlab (ffe056f)

2.8.4 (2019-08-12)

... (truncated)

Commits

8d4b369 chore(release): 2.8.9

29adfe5 fix: backport regex fix from #76

afeaefd chore(release): 2.8.8

5038b18 fix: #61 & #65 addressing issues w/ url.URL implmentation which regressed nod...

7440afa chore(release): 2.8.7

2d0bb66 fix: Do not attempt to use url.URL when unavailable

f2cdfcf fix: Do not pass scp-style URLs to the WhatWG url.URL

e1b83df chore(release): 2.8.6

ff259a6 Ensure passwords in hosted Git URLs are correctly escaped

624fd6f chore(release): 2.8.5

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dependencies javascript
opened by dependabot[bot] 1
Bump lodash from 4.17.19 to 4.17.21
Bumps lodash from 4.17.19 to 4.17.21.

Commits

f299b52 Bump to v4.17.21

c4847eb Improve performance of toNumber, trim and trimEnd on large input strings

3469357 Prevent command injection through _.template's variable option

ded9bc6 Bump to v4.17.20.

63150ef Documentation fixes.

00f0f62 test.js: Remove trailing comma.

846e434 Temporarily use a custom fork of lodash-cli.

5d046f3 Re-enable Travis tests on 4.17 branch.

aa816b3 Remove /npm-package.

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dependencies javascript
opened by dependabot[bot] 1
Update docs
[ ] #91

[ ] Try to see if we can have all the docs live in the README instead of an external site. I hope that the library is simple enough to learn that we don't need an external site anymore.

[ ] Update docs with new API.
opened by levibostian 0
Test new API in an app
[ ] #90

Time to give this library a test in a real app! Let's see if we like the API!

[ ] Create a sample app module in this project. Make sure it's small so it's easy to maintain in the future.
opened by levibostian 0
Implement new API for rest of code base
[ ] #90

[ ] Finish new API implementation by implementing into rest of code (probably the testing portion and coroutine version). Right now would be a good time to look at why we originally created the testing functionality of the library. Do we need it anymore? Should we modify it?
opened by levibostian 0
Implement new API for repository portion of code that's less boilerplate
[ ] Design new API for teller that's less boilerplate heavy.

[ ] Implement new API for teller with this new API.

[ ] Write automated tests as you go to make sure we are writing testable code.
opened by levibostian 0
pull out coroutine specific code into it's own module
[ ] #87

[ ] #88

[ ] Now, we are able to make this library have zero dependencies. Move the coroutine code into it's own module. This allows us to have the core module have zero dependencies.
opened by levibostian 0

Releases(0.2.0-alpha)

0.2.0-alpha(Mar 15, 2019)
[0.2.0-alpha] - 2019-03-15

Testing utilities and improved API for CacheState objects!

Changed

Breaking Change The deliver_() functions in OnlineCacheState and LocalCacheState have been replaced with a more Kotlin like callback API with lambdas. 47

Remove Java close compatibility. Because Kotlin and Java work nicely together, Teller may still work nicely with Java, but Teller is no longer focusing on making sure that is the case. 46

Expose public properties to OnlineCacheState.

Added

Create code of conduct and add to the docs.

Create set of utilities into Teller to assist in creating unit, integration, and instrumentation tests.

Create section in docs on how to test with Teller in your app.

Create tests in example to show examples on how to use Teller's testing utilities and to test the API as it's developed.

Fixed

Fixed bug in OnlineCacheState where refresh calls may not call refreshComplete() after a fetch finished successfully.

Source code(tar.gz)
Source code(zip)
0.1.0-alpha(Feb 22, 2019)
[0.1.0-alpha] - 2019-02-21

Changes to the API, docs, full test suite, thread safety and bug fixes.

Changed

Breaking Change OnlineRepository's abstract functions have all been renamed. This is to try and be more descriptive of what Teller is doing to help developers implement faster.

Breaking Change OnlineDataState.deliver__() listeners has been renamed.

Breaking Change OnlineRepository.observeCachedData() and OnlineRepository.isDataEmpty() gets called on UI thread. OnlineRepository.saveData() gets called on background thread.

OnlineRepository.observe() and LocalRepository.observe() no longer throws. Observe anytime you wish and receive event updates through all changes of the repository.

OnlineRepository.refresh() calls are shared between all OnlineRepository instances. This saves on the amount of network calls performed. OnlineRepository.observe() observers are all notified when OnlineRepository.refresh() actions are performed.

OnlineRepository is thread safe.

Removed Teller.sync()

Added

OnlineRepository now supports observing 2+ queries, as long as it's the same type of data.

Delete Teller data for development purposes or when someone logs out of your app and the data is cleared via Teller.clear().

Full test suite for unit testing and implementation testing!

Full documentation website!

Contributors changelog

Changed

OnlineDataState has been refactored to using a finite state machine implementation. See OnlineDataStateStateMachine. It's a immutable object that represents an immutable OnlineDataState instance.

Fetching fresh cache data and the state of the cache data have been decoupled in OnlineDataState. Each of these 2 different states (fetching and cache) are updated independently from each other in the OnlineRepository so decoupling them fixes bugs that have been reported.

OnlineRepository is designed to be "useless" after .dispose() is called. All aync tasks are cancelled or the results are ignored when they are complete. Calling any function on OnlineRepository after dispose() will throw an exception.

Source code(tar.gz)
Source code(zip)
0.0.1(May 21, 2018)
[0.0.1] - 2018-05-21

First release of Teller!

Added

LocalRepository for saving and querying locally cached data.

OnlineRepository for saving, querying, and fetching remote data that is cached locally.

Teller.shared.sync() to sync a list of OnlineRepository instances at once.

Example Android app to show how to use Teller and, for now until tests are written, to test Teller.

README.md documentation on status of project and how to use it.

Source code(tar.gz)
Source code(zip)