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turbo rpc
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package rpc.turbo.util.uuid;

import static rpc.turbo.util.HexUtils.byteToHexLE;
import static rpc.turbo.util.UnsafeUtils.unsafe;
import static sun.misc.Unsafe.ARRAY_BYTE_BASE_OFFSET;

import java.io.Serializable;
import java.util.Objects;

import io.netty.buffer.ByteBuf;
import io.netty.util.internal.ThreadLocalRandom;
import rpc.turbo.util.SystemClock;
import rpc.turbo.util.UnsafeStringUtils;

/**
 * 
 * A globally unique identifier for objects.
 * 
 *
 * 
 * Consists of 12 bytes, divided as follows:
 * 
 * 
 * 
 * 
 * 
 * 
 * 
 * 
 * 
 * 
 * 
 * 
 * 
 * 
 * 
 * 
 * 
 * 
 * 
 * 
 * 
 * 
 * 
 * 
 * 
 * RandomId layout0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
time random long
 *
 * 
 * Instances of this class are immutable.
 * 
 *
 */
public final class RandomId128 implements Serializable {

	private static final long serialVersionUID = 851964912749068324L;

	public final long timestamp;
	public final long random;

	/**
	 * Gets a new object id.
	 *
	 * @return the new id
	 */
	public static RandomId128 next() {
		return new RandomId128(SystemClock.fast().mills(), ThreadLocalRandom.current().nextLong());
	}

	public RandomId128(final long timestamp, final long random) {
		this.timestamp = timestamp;
		this.random = random;
	}

	public RandomId128(final ByteBuf buffer) {
		Objects.requireNonNull(buffer, "buffer");

		timestamp = buffer.readLong();
		random = buffer.readLong();
	}

	public long getTimestamp() {
		return timestamp;
	}

	public long getRandom() {
		return random;
	}

	public void writeTo(final ByteBuf buffer) {
		buffer.writeLong(timestamp);
		buffer.writeLong(random);
	}

	public String toHexString() {
		// java9 下更高效
		byte[] bytes = new byte[32];

		unsafe().putShort(bytes, ARRAY_BYTE_BASE_OFFSET + 0, byteToHexLE(timestamp >> 52));
		unsafe().putShort(bytes, ARRAY_BYTE_BASE_OFFSET + 2, byteToHexLE(timestamp >> 48));
		unsafe().putShort(bytes, ARRAY_BYTE_BASE_OFFSET + 4, byteToHexLE(timestamp >> 40));
		unsafe().putShort(bytes, ARRAY_BYTE_BASE_OFFSET + 6, byteToHexLE(timestamp >> 32));
		unsafe().putShort(bytes, ARRAY_BYTE_BASE_OFFSET + 8, byteToHexLE(timestamp >> 24));
		unsafe().putShort(bytes, ARRAY_BYTE_BASE_OFFSET + 10, byteToHexLE(timestamp >> 16));
		unsafe().putShort(bytes, ARRAY_BYTE_BASE_OFFSET + 12, byteToHexLE(timestamp >> 8));
		unsafe().putShort(bytes, ARRAY_BYTE_BASE_OFFSET + 14, byteToHexLE(timestamp));

		unsafe().putShort(bytes, ARRAY_BYTE_BASE_OFFSET + 16, byteToHexLE(random >> 52));
		unsafe().putShort(bytes, ARRAY_BYTE_BASE_OFFSET + 18, byteToHexLE(random >> 48));
		unsafe().putShort(bytes, ARRAY_BYTE_BASE_OFFSET + 20, byteToHexLE(random >> 40));
		unsafe().putShort(bytes, ARRAY_BYTE_BASE_OFFSET + 22, byteToHexLE(random >> 32));
		unsafe().putShort(bytes, ARRAY_BYTE_BASE_OFFSET + 24, byteToHexLE(random >> 24));
		unsafe().putShort(bytes, ARRAY_BYTE_BASE_OFFSET + 26, byteToHexLE(random >> 16));
		unsafe().putShort(bytes, ARRAY_BYTE_BASE_OFFSET + 28, byteToHexLE(random >> 8));
		unsafe().putShort(bytes, ARRAY_BYTE_BASE_OFFSET + 30, byteToHexLE(random));

		String hex = UnsafeStringUtils.toLatin1String(bytes);

		return hex;
	}

	@Override
	public int hashCode() {
		final int prime = 31;
		int result = 1;
		result = prime * result + (int) (random ^ (random >>> 32));
		result = prime * result + (int) (timestamp ^ (timestamp >>> 32));
		;
		return result;
	}

	@Override
	public boolean equals(Object obj) {
		if (this == obj)
			return true;

		if (obj == null)
			return false;

		if (getClass() != obj.getClass())
			return false;

		RandomId128 other = (RandomId128) obj;
		if (random != other.random)
			return false;

		if (timestamp != other.timestamp)
			return false;

		return true;
	}

	@Override
	public String toString() {
		return toHexString();
	}

	public static void main(String[] args) {
		RandomId128 id = RandomId128.next();

		System.out.println(id.toHexString());
	}

}