40 lines
990 B
Go
40 lines
990 B
Go
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package NumGen
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import (
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"math/big"
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)
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// Internal function to generate a unique ID with the given sequenceNumber.
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func generateUniqueID(sequenceNumber int) (id int64) {
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// Ensure, that the sequenceNumber is not smaller than 0:
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if sequenceNumber < 0 {
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sequenceNumber = sequenceNumber * -1
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}
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// Ensure, that the sequenceNumber is not bigger than 999:
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if sequenceNumber > 999 {
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sequenceNumber = 999
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}
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// Convert the sequenceNumber to a 64 bit integer:
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seq := int64(sequenceNumber)
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// Generate the first and second part of the ID:
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timeID := generateTimeID() // First part
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machineID := generateMachineID() // Second part
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// Convert all numbers to big integers:
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bigSEQ := big.NewInt(seq)
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bigMachineID := big.NewInt(machineID)
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bigTimeID := big.NewInt(timeID)
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// Add the parts to get the result:
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bigResult := bigTimeID.Add(bigTimeID, bigMachineID)
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bigResult = bigResult.Add(bigResult, bigSEQ)
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// The result as 64 bit integer:
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id = bigResult.Int64()
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return
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}
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