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November 29, 2017 06:04
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| val infiniteTransactionsStream = | |
| Stream.continually(s"$randomUser() sent $randomValue() BTC to $randomUser()") | |
| Source(infiniteTransactionsStream) | |
| .grouped(5) //group transactions into 5 element blocks | |
| .scan(0.hashCode.toString) { (previousBlockHash, transactions) => | |
| //hash for block is defined as hash of transactions hash and previous block hash | |
| (transactions.hashCode(), previousBlockHash).hashCode.toString | |
| } | |
| .mapAsync(1)(saveHashAndReturnIt) | |
| .runForeach(savedHash => println(s"saved block with hash:$savedHash")) |
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