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xchange-stream

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XChange-stream is a Java library providing a simple and consistent streaming API for interacting with Bitcoin and other crypto currency exchanges via WebSocket protocol. It is build on top of of XChange library providing new interfaces for streaming API. User can subscribe for live updates via reactive streams of RxJava library.

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Download Latest Version (.zip)

# Installation Guide

1. Get the code

git clone https://github.com/bitrich-info/xchange-stream

Downloads the entire project code from GitHub to your computer.

cd xchange-stream

Moves into the project folder you just downloaded.

2. Maven (Java)

Medium Recommended

Prerequisites

Git Needed to download the project code from GitHub.
JDK (Java) Required to build and run Java projects.
Maven The build tool used for the mvn command.

mvn clean install

Installs dependencies and builds the project using Maven.

✅ A BUILD SUCCESS message means it worked. The output is created under target/.

// repository documentation

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# ARCHIVED

**This project has now been merged into the [XChange library](https://github.com/knowm/XChange).  There will be no further releases and pull requests will not be accepted. Please use XChange from `5.0.0-SNAPSHOT` onwards, which is, for now, 100% compatible.**

# XChange-stream

XChange-stream is a Java library providing a simple and consistent streaming API for interacting with Bitcoin and other crypto currency exchanges via WebSocket protocol.

It is build on top of the [XChange library](https://github.com/knowm/XChange) providing new interfaces for the exchanges' streaming APIs. Users can subscribe for live updates via reactive streams of [RxJava library](https://github.com/ReactiveX/RxJava).

## Why use it?

- Easy to use - no need to hack WebSocket and other backends.
- Consistent & simple API across all implemented exchanges.
- Extends well-known & active Java library [XChange](https://github.com/knowm/XChange).
- [Reactive streams](http://reactivex.io/) are fun to work with. 
- Modular extensibility.

## Getting started

### Include in your project

Xchange-stream is on Maven Central. You will need `xchange-stream-core` dependency and `xchange-XYZ` where XYZ is supported exchange (eg. `xchange-bitstamp`). Add the following into your `pom.xml`.

#### Maven

```xml
<dependency>
    <groupId>info.bitrich.xchange-stream</groupId>
    <artifactId>xchange-stream-core</artifactId>
    <version>x.y.z</version>
</dependency>

<dependency>
    <groupId>info.bitrich.xchange-stream</groupId>
    <artifactId>xchange-XYZ</artifactId>
    <version>x.y.z</version>
</dependency>
```

[![Maven Central](https://maven-badges.herokuapp.com/maven-central/info.bitrich.xchange-stream/xchange-stream-core/badge.svg?style=flat)](https://search.maven.org/#search%7Cga%7C1%7Ca%3A%22xchange-stream-core%22)

For snapshots version (built from develop branch), add the following repository to your `pom.xml` file.

```xml
<repository>
  <id>sonatype-oss-snapshot</id>
  <snapshots/>
  <url>https://oss.sonatype.org/content/repositories/snapshots</url>
</repository>
```

#### Versioning

XChange-stream follows major and minor version from XChange library. So version 4.2.x is based on latest 4.2. release of XChange.

### Example

Use the same library as XChange but instead of `ExchangeFactory` use `StreamingExchangeFactory` that creates `StreamingExchange` instead of `Exchange`. Then you can call `getStreamingMarketDataService` to subscribe to trade data.

```java
StreamingExchange exchange = StreamingExchangeFactory.INSTANCE.createExchange(BitstampStreamingExchange.class.getName());

// Connect to the Exchange WebSocket API. Blocking wait for the connection.
exchange.connect().blockingAwait();

// Subscribe to live trades update.
exchange.getStreamingMarketDataService()
        .getTrades(CurrencyPair.BTC_USD)
        .subscribe(trade -> {
            LOG.info("Incoming trade: {}", trade);
        }, throwable -> {
            LOG.error("Error in subscribing trades.", throwable);
        });

// Subscribe order book data with the reference to the subscription.
Disposable subscription = exchange.getStreamingMarketDataService()
                                  .getOrderBook(CurrencyPair.BTC_USD)
                                  .subscribe(orderBook -> {
                                       // Do something
                                  });

// Unsubscribe from data order book.
subscription.dispose();

// Disconnect from exchange (non-blocking)
exchange.disconnect().subscribe(() -> LOG.info("Disconnected from the Exchange"));
```
More information about reactive streams can be found at [RxJava wiki](https://github.com/ReactiveX/RxJava/wiki).

## What is supported

Listening for live updates of:

| Exchange         | order books        | trades (public)    | tickers            | balances           | trades (user)      | open orders        | notes |
| ---------------- | ------------------ | ------------------ | ------------------ | ------------------ | ------------------ | ------------------ | ----- |
| **Bankera**      | :heavy_check_mark: | :heavy_check_mark: | :construction:     | :question:         | :question:         | :question:         | Ticker support could be implemented using the trades and order book streams, even though the exchange doesn't explicitly return a ticker stream. |
| **Binance**      | :heavy_check_mark: | :heavy_check_mark: | :heavy_check_mark: | :heavy_check_mark: | :heavy_check_mark: | :heavy_check_mark: | |
| **Bitfinex**     | :heavy_check_mark: | :heavy_check_mark: | :heavy_check_mark: | :heavy_check_mark: | :heavy_check_mark: | :heavy_check_mark: | |
| **Bitflyer**     | :heavy_check_mark: | :heavy_check_mark: | :heavy_check_mark: | :question:         | :question:         | :question:         | |
| **BitMEX**       | :heavy_check_mark: | :heavy_check_mark: | :heavy_check_mark: | :construction:     | :construction:     | :construction:     | We are short of maintainers able to review pull requests and provide support for Bitmex, so there is a backlog of pull requests and support is likely broken. Can you help? See [#180](https://github.com/bitrich-info/xchange-stream/pull/180) for reference if attempting to add private channel support. |
| **Bitstamp**     | :heavy_check_mark: | :heavy_check_mark: | :x:                | :question:         | :question:         | :question:         | |
| **CEX.IO**       | :heavy_check_mark: | :x:                | :x:                | :question:         | :question:         | :question:         | New support, not widely tested  |
| **Coinbase Pro** | :heavy_check_mark: | :heavy_check_mark: | :heavy_check_mark: | :heavy_check_mark: | :heavy_check_mark: | :heavy_check_mark: | |
| **Coinmate**     | :heavy_check_mark: | :heavy_check_mark: | :x:                | :heavy_check_mark: | :heavy_check_mark: | :heavy_check_mark: | |
| **Gemini**       | :heavy_check_mark: | :heavy_check_mark: | :x:                | :construction:     | :construction:     | :construction:     | |
| **Kraken**       | :heavy_check_mark: | :heavy_check_mark: | :heavy_check_mark: | :x:                | :heavy_check_mark: | :heavy_check_mark: | |
| **LGO**          | :heavy_check_mark: | :heavy_check_mark: | :heavy_check_mark: | :heavy_check_mark: | :heavy_check_mark: | :heavy_check_mark: | |
| **OKCoin**       | :heavy_check_mark: | :heavy_check_mark: | :heavy_check_mark: | :question:         | :question:         | :question:         | |
| **OKEx**         | :heavy_check_mark: | :heavy_check_mark: | :heavy_check_mark: | :question:         | :question:         | :question:         | See [#180](https://github.com/bitrich-info/xchange-stream/pull/180) for reference if attempting to add private channel support. |
| **Poloniex**     | :heavy_check_mark: | :heavy_check_mark: | :heavy_check_mark: | :question:         | :question:         | :question:         | |

- :heavy_check_mark: - implemented
- :construction: - missing but can be implemented
- :x: - not supported by the exchange
- :question: - exchange support level not known (please fill in)

If you missing a specific exchange implementation, feel free to propose a pull request or open an issue with some sweet BTC bounty. 
 
## Open Source Projects Using XChange-Stream

This is an, not so complete, list of projects that use XChange-Stream, feel free to add your project below.
- [XChange-Trade-Bot](https://github.com/yurivin/xchange-trade-bot) by yurivin
- [Crypto Websockets](https://github.com/firepol/crypto-websockets) by firepol
- [CryptoRealTime](https://github.com/GoogleCloudPlatform/professional-services/tree/master/examples/cryptorealtime) by galic1987
- [Orko - Multi-exchange trading](https://github.com/gruelbox/orko) by gruelbox/badgerwithagun

## License
Copyright 2017 Zdenek Dolezal, Michal Oprendek

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.