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# re-frame-trace
`re-frame-trace` is a programmer's dashboard. It allows you to see inside a running `re-frame`
application, helping you to understand it and debug it.
`re-frame-trace` is a programmer's dashboard. It helps you to see inside a running `re-frame`
application, allowing you to better understand it and debug it.
**Status:** Alpha. [![Clojars Project](https://img.shields.io/clojars/v/day8.re-frame/trace.svg)](https://clojars.org/day8.re-frame/trace)
@ -9,24 +9,23 @@ application, helping you to understand it and debug it.
**Note** [the latest version 0.1.14](https://github.com/Day8/re-frame-trace/releases/tag/0.1.14) ALSO requires the latest version of re-frame itself - `v0.10.3-alpha2`.
## How It Might Help You
### What It Can Do For You
What it can do for you:
- Help you to learn `re-frame`. If you are new to `re-frame`, it will assist you to
understand the data flows involved (the dominoes).
- Help you to explore and learn an unfamiliar `re-frame` codebase.
> The following list is aspirational. `re-frame-trace` remains a WIP. We're getting there.
1. Helps you to learn `re-frame`. If you are new to `re-frame`, it will assist you to
understand the data flows involved (the dominoes).
2. Helps you to explore and learn an unfamiliar `re-frame` codebase.
When I click on this "X" button, it shows me what event is `dispatch`-ed
and in what namespace the associated event handler is registered. And,
"oh look, that's interesting - four subscriptions recalculated". Etc.
- Help you with debugging. In particular, it will assist you to write and debug
event handlers, which is useful because they hold most of the logic in your `re-frame` apps.
- Help you to find performance problems and/or detect where there is
3. Helps you with debugging. In particular, it will assist you to write and debug
event handlers, which is useful because they hold most of the logic in your `re-frame` apps.
4. Helps you to find performance problems and/or detect where there is
unnecessary computation occurring.
(Okay, so this list is slightly aspirational. `re-frame-trace` is
absolutely useful, and you should use it, but delivery against the ideal above is uneven)
## Epoch Oriented
### Epoch Oriented
`re-frame` applications are computationally regular. First an event happens,
and then boom, boom, boom go a series of known computational steps (dominoes),
@ -38,31 +37,31 @@ Each `re-frame` event and its consequent computation forms a discrete "epoch"
which can be inspected, analysed and understood independently of other epochs. This
tool is epoch-oriented.
And, yes, there's the ability to do time travel debugging - you can go backwards
and forwards through epochs - but that's really not the most interesting aspect
of what you get.
And, yes, it is something of a "time travel debugger" - you can go backwards
and forwards through epochs - but that's really not the most interesting or powerful
aspect of what `re-frame-trace` delivers.
## It is about Data
### It is about Data
As it runs, `re-frame` generates detailed "trace" which is captured as data (not strings).
This trace is like an x-ray of the app's functioning.
As it runs, `re-frame` generates detailed "trace" which is captured as data, not strings.
This trace provides an x-ray of your app's functioning.
In addition, re-frame is as much "data oriented" as it is functional in design.
It "flows" data, in a loop, through the functions you provide.
So, data is at the center of `re-frame-trace`.
So, data is at the center of `re-frame-trace`.
## Data Dashboard
### Data Dashboard
There's often too much data - too much detail.
So, `re-frame-trace` tries to be something of a "dashboard" in the sense that
it tries to turn "raw data" into "information" through curated analysis, and "roll ups"
which deliver insight "at a glance". Then allowing you to "drill into the detail".
designed to deliver insight "at a glance". But still allowing you to "drill into the detail".
Right. So, this tool an epoch-oriented, interactive data dashboard for
gaining insights and assisting debugging. It is also a work in progress,
so this grand description runs well ahead of what is delivered right now.
gaining insights and assisting debugging. But, it is also a work in progress,
so these magnificent descriptions run well ahead of what is delivered right now.
But we're getting there.