Uuid factory

SELECT UUID_SHORT(); -> 92395783831158784Note UUID_SHORT() does not work with statement-based replication. UUID_TO_BIN(string_uuid), UUID_TO_BIN(string_uuid, swap_flag) Converts a string UUID to a binary UUID and returns the result. (The IS_UUID() function description lists the permitted string UUID formats.) The return binary UUID is a VARBINARY(16) value. If the UUID argument is NULL, the return value is NULL. If any argument is invalid, an error occurs. UUID_TO_BIN() takes one or two arguments: The one-argument form takes a string UUID value. The binary result is in the same order as the string argument. The two-argument form takes a string UUID value and a flag value: If swap_flag is 0, the two-argument form is equivalent to the one-argument form. The binary result is in the same order as the string argument. If swap_flag is 1, the format of the return value differs: The time-low and time-high parts (the first and third groups of hexadecimal digits, respectively) are swapped. This moves the more rapidly varying part to the right and can improve indexing efficiency if the result is stored in an indexed column. Time-part swapping assumes the use of UUID version 1 values, such as are generated by the UUID() function. For UUID values produced by other means that do not follow version 1 format, time-part swapping provides no benefit. For details about version 1 format, see the UUID() function description. Suppose that you have the following string UUID value: mysql> SET @uuid = '6ccd780c-baba-1026-9564-5b8c656024db'; To convert the string UUID to binary with or without time-part swapping, use UUID_TO_BIN(): mysql> SELECT HEX(UUID_TO_BIN(@uuid));+----------------------------------+| HEX(UUID_TO_BIN(@uuid)) |+----------------------------------+| 6CCD780CBABA102695645B8C656024DB |+----------------------------------+mysql> SELECT HEX(UUID_TO_BIN(@uuid, 0));+----------------------------------+| HEX(UUID_TO_BIN(@uuid, 0)) |+----------------------------------+| 6CCD780CBABA102695645B8C656024DB |+----------------------------------+mysql> SELECT HEX(UUID_TO_BIN(@uuid, 1));+----------------------------------+| HEX(UUID_TO_BIN(@uuid, 1)) |+----------------------------------+| 1026BABA6CCD780C95645B8C656024DB |+----------------------------------+ To convert a binary UUID returned by UUID_TO_BIN() to a string UUID, use BIN_TO_UUID(). If you produce a binary UUID by calling UUID_TO_BIN() with a second argument of 1 to swap time parts, you should also pass a second argument of 1 to BIN_TO_UUID() to unswap the time parts when converting the binary UUID back to a string UUID: mysql> SELECT BIN_TO_UUID(UUID_TO_BIN(@uuid));+--------------------------------------+| BIN_TO_UUID(UUID_TO_BIN(@uuid)) |+--------------------------------------+| 6ccd780c-baba-1026-9564-5b8c656024db |+--------------------------------------+mysql> SELECT BIN_TO_UUID(UUID_TO_BIN(@uuid,0),0);+--------------------------------------+| BIN_TO_UUID(UUID_TO_BIN(@uuid,0),0) |+--------------------------------------+| 6ccd780c-baba-1026-9564-5b8c656024db |+--------------------------------------+mysql> SELECT BIN_TO_UUID(UUID_TO_BIN(@uuid,1),1);+--------------------------------------+|

User Id as the partition key and Group Id as the sort key, and it will be used to determine the groups a user belongs to.Group Id: UUID (partition key)User Id: UUID (sort key)……Group Id: UUID (sort key)User Id: UUID (partition key)……When using this approach, you need to ensure data consistency in both tables, which can be achieved by implementing distributed transactions when making changes.APIThe following endpoints are added to the existing endpoints we already have:createGroup(userId: UUID, name: String, members: List) - Creates a new group with the provided details and returns the Group Id.joinGroup(userId: UUID, groupId: UUID) - Allows a user to join a specific group by providing the Group Id.leaveGroup(userId: UUID, groupId: UUID) - Allows a user to leave a specific group by providing the Group Id.getGroupMembers(groupId: UUID) - Retrieves the list of members belonging to a specific group by providing the Group Id.getAllGroups(userId: UUID) - Retrieves the list of groups in which a user is a member by providing the User Id.getGroupMessages(groupId: UUID, timestamp: Long) - Retrieves the messages sent in a specific group by providing the Group Id.ArchitectureWhile the high-level architecture remains unchanged, the handling of group messages will differ slightly from handling direct messages. When a user sends a message to a group, it should be delivered to all members of that group. Below is a diagram illustrating this process.This diagram is sufficient for the initial understanding, but there are a few key points to consider.In the above diagram, we use synchronous HTTP requests to transfer messages from one chat service to another. As a result, there may be a potential issue with the order in which these messages are received by the users. Additionally, in cases of excessive external or internal load, the chat service may start throttling. This means the service will limit the rate at which it processes requests or sends messages to cope with the increased load and prevent server overload.To address the issue of message order, it can be handled on the client side. If a client receives a message with a messageId greater than the last message in its

This tool allows you to easily generate GUIDs/ UUIDs for your projects or any other purpose. Simply use the default GUID/UUID generated on page load or generate multiple GUIDs/UUIDs as needed. Generate More? Generate in Uppercase Please exercise caution when using these GUIDs. Their uniqueness and suitability are not guaranteed or assured in any way. Use at your own discretion. What is a GUID/UUID? A GUID is a 128-bit identifier used in software applications to ensure uniqueness across different systems and environments. How are GUIDs generated? GUIDs are generated using random numbers combined with predefined formats to ensure their uniqueness. Types of UUID Version Generation Method Key Features Version 1 Generated using timestamp and node ID (e.g., MAC address) Includes time and node-specific information Version 2 Similar to V1, but includes POSIX UID/GID Used for security domain identification Version 3 Generated using MD5 hash of namespace and name Deterministic; same inputs produce the same UUID Version 4 Random or pseudo-random numbers Most common; highly unique Version 5 Generated using SHA-1 hash of namespace and name Similar to V3 but uses stronger hashing Version 6 Reordered timestamp and random data Improves database indexing by preserving timestamp order Version 7 Generated using Unix epoch timestamp and random data Optimized for time-based ordering Version 8 Custom format defined by implementers Provides flexibility for unique use cases How to Identify UUID Version The version of a UUID can be determined by looking at the 13th hexadecimal digit (first digit of the 7th byte) in the UUID string. For example: UUID Structure UUID Format A UUID is typically represented in the following format: 8-4-4-4-12 Example: 123e4567-e89b-12d3-a456-426614174000