Example usage for java.util.concurrent ThreadLocalRandom nextBytes

Introduction

In this page you can find the example usage for java.util.concurrent ThreadLocalRandom nextBytes.

Prototype

public void nextBytes(byte[] bytes) 

Source Link

Document

Generates random bytes and places them into a user-supplied byte array.

Usage

From source file:com.google.gerrit.server.mail.send.SmtpEmailSender.java

public static String generateMultipartBoundary(String textBody, String htmlBody) throws EmailException {
    byte[] bytes = new byte[8];
    ThreadLocalRandom rng = ThreadLocalRandom.current();

    // The probability of the boundary being valid is approximately
    // (2^64 - len(message)) / 2^64.
    ///*  ww  w  .  ja v a2s  . c o  m*/
    // The message is much shorter than 2^64 bytes, so if two tries don't
    // suffice, something is seriously wrong.
    for (int i = 0; i < 2; i++) {
        rng.nextBytes(bytes);
        String boundary = BaseEncoding.base64().encode(bytes);
        String encBoundary = "--" + boundary;
        if (textBody.contains(encBoundary) || htmlBody.contains(encBoundary)) {
            continue;
        }
        return boundary;
    }
    throw new EmailException("Gave up generating unique MIME boundary");
}

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