alayor/coin-trading

Application that connects to Bitso cryptocurrency exchange services.

Stock Trading

Application that connects to the Bitso cryptocurrency exchange, maintains state between the application and Bitso, and simulates trade execution following a simple trading strategy.

Usage

• To start app: java -jar app.jar
• To build project: ./gradlew build
• To run Online Integration Tests: ./gradlew onlineITest
• To run Offline Integration Tests: ./gradlew offlineITest

Assumptions

• Regarding "Display the X most recent trades on the same UI". The X represents the same number as in the best bids and best asks configuration.

• X will have a maximum of 500.

• If X is greater than the available trades at any particular moment the UI will display the maximum number of trades at that moment.

• Imaginary or simulated trades created using "contrarian trading strategy" will have the same info (id, price, created_at, etc.) as the previous trade.

• The default value of M and N is three.

• If M is zero or less than zero no simulated trade will be added.

• If N is zero or less than zero no simulated trade will be added.

• When a new simulated trade is created using the "contrarian trading strategy", the upticks and downticks count will reset. E.g.

  M = 3
  N = 3
  price = 1000  //uptick = 0, downtick = 0
  price = 1001  //uptick = 1, downtick = 0
  price = 1002  //uptick = 2, downtick = 0
  price = 1003  //uptick = 3, downtick = 0
  price = 1003  //uptick = 0, downtick = 0 New simulated trade, count reset
  price = 1004  //uptick = 1, downtick = 0

• Uptick and downtick counting will start right after the system preloads old trades. E.g.

  // System starts and shows old trades
  price = 1000
  price = 1001
  price = 1002
  price = 1003
  // Then the systems retrieves new trades and starts counting
  price = 1004  //uptick = 0, downtick = 0
  price = 1002  //uptick = 0, downtick = 1

Checklist

Feature	File name	Method name
Schedule the polling of trades over REST.	TradingService	start
Request a book snapshot over REST.	OrderBookUpdater	loadOrderBook
Listen for diff-orders over websocket.	DiffOrdersMessageHandler	onMessage
Replay diff-orders.	DiffOrderApplier	applyDiffOrders
Use config option X to request recent trades.	TradingService	getLastTrades
Use config option X to limit number of ASKs displayed in UI.	OrderBookHolder	getBestAsks
The loop that causes the trading algorithm to reevaluate.	TradingSimulator	addSimulatedTrades