package com.zy.iot.util;
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import java.nio.charset.StandardCharsets;
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import java.security.MessageDigest;
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import java.util.Locale;
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import java.util.UUID;
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public final class IotInstructionIdGenerator {
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private IotInstructionIdGenerator() {
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}
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public static String generate() {
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return generate(UUID.randomUUID() + "-" + System.nanoTime());
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}
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public static String generate(String seed) {
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try {
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MessageDigest digest = MessageDigest.getInstance("SHA-1");
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byte[] hash = digest.digest(seed.getBytes(StandardCharsets.UTF_8));
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StringBuilder builder = new StringBuilder();
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for (byte item : hash) {
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builder.append(String.format(Locale.ROOT, "%02x", item));
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}
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return builder.substring(0, 20).toUpperCase(Locale.ROOT);
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} catch (Exception e) {
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throw new IllegalStateException("generate iot instruction id failed", e);
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}
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}
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}
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