ThreadLocalUtils.java

package lbms.plugins.mldht.kad.utils;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.util.Random;

import the8472.bencode.BDecoder;

public class ThreadLocalUtils {

	private static ThreadLocal<Random> randTL = ThreadLocal.withInitial(() -> {
		try
		{
			return SecureRandom.getInstance("SHA1PRNG");
		} catch (NoSuchAlgorithmException e) {
			return new SecureRandom();
		}
	});
	
	private static ThreadLocal<MessageDigest> sha1TL = ThreadLocal.withInitial(() -> {
		try {
			return MessageDigest.getInstance("SHA");
		} catch (NoSuchAlgorithmException e) {
			throw new Error("expected SHA1 digest to be available", e);
		}
	});
	
	private static ThreadLocal<BDecoder> decoder = ThreadLocal.withInitial(() -> new BDecoder());
	

	public static Random getThreadLocalRandom() {
		return randTL.get();
	}
	
	public static BDecoder getDecoder() {
		return decoder.get();
	}
	
	public static MessageDigest getThreadLocalSHA1() {
		return sha1TL.get();
	}
	
}