Add documentation

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mgabriel 2018-08-15 16:36:15 +02:00
parent 6e64c9e54b
commit 6d81699d5e

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@ -16,7 +16,7 @@ Chronicle Queue is a low latency library that persists everything on disk with m
### Functionalities
With the provided ChronicleStore, you can:
- Store a reactive stream.
- Subscribe to the history + live updates of the store with a reactive stream (with a [Flux](http://projectreactor.io/docs/core/release/reference/#flux) from project [reactor-core](https://github.com/reactor/reactor-core)).
- Subscribe to the history + live updates of the store with a reactive stream (the store returns a [Flux](http://projectreactor.io/docs/core/release/reference/#flux) from project [reactor-core](https://github.com/reactor/reactor-core)).
- Replay the history with the original timing, with a time acceleration (e.g. replay at twice the speed).
- Replay the history in a loop.
@ -29,10 +29,10 @@ This project can be useful for different use cases:
- a simple alternative to Kafka for basic uses cases: no need to install anything, it's all persisted on disk :smiley:
### Example usage
## Example usage
####Create a Chronicle Store:
###Create a Chronicle Store:
Please note that you must provide a way to serialize the data as binary.
The easiest solution is to use a binary serialization protocol such as [Protobuf](https://developers.google.com/protocol-buffers/), [Avro](https://avro.apache.org/docs/current/), etc. In this case the binary serialization will be supported out of the box.
@ -45,7 +45,7 @@ The 2nd and 3rd arguments are the serializer and deserializer for your data.
ChronicleStore<DummyObject> chronicleStore = new ChronicleStore<>(PATH, DummyObject::toBinary, DummyObject::fromBinary);
```
####Store a stream of data
###Store a stream of data
The store method will return a handle that can be used to stop the storage.
Otherwise the data stream will be store until it completes or an error is received on the stream.
@ -55,7 +55,7 @@ Flux<DummyObject> source = ...
Disposable handle = chronicleStore.store(source);
```
####Subscribe to the store
###Subscribe to the store
We can subscribe to the store and print old values, as well as new values being persisted in the store.
@ -65,7 +65,7 @@ Flux<DummyObject> allValues = chronicleStore.retrieveAll();
.blockLast();
```
We can also replay the history with the same timing as the original stream:
We can also replay the history with the same timing as the original stream, and in an infinite loop:
```java
chronicleStore.replayHistory(DummyObject::timestamp)
@ -79,7 +79,7 @@ In order to replay data with the original timing, we need to provide a function
Chronicle-flux could potentially add a timestamp to the values when they are persisted, but this would be a poor design choice since the data would be timestamped at the very end of the chain, possibly after passing through several queues. It is in general a better idea to add a timestamp on the data as soon as they enter the system in order to have an accurate time.
####Runnable demo
###Runnable demo
if you want to run some code samples, have a look at the demo folder in the test directory that contains several runnable classes.