Detailed explanation

Libraft Core is a Java class library for building a distributed consistency system. It provides a series of functions to simplify the development and management of distributed systems.The following will be introduced in detail the functions provided by Libraft Core and the corresponding Java code example. 1. Paxos algorithm support Libraft Core implements the Paxos algorithm, which is a classic algorithm for solving consistency problems in distributed systems.By reaching consensus between multiple nodes, the PAXOS algorithm ensures the consistency and reliability of the system. Example code: Raftalgorithm algorithm = new paxosalgorithm (); // Create the Paxos algorithm instance algorithm.initialize (); // Be initialization algorithm // Execute the operation on the algorithm instance Algorithm.propose (value); // Proposal a value Algorithm.accept (value); // accept a value Second, state machine management Libraft Core provides a simple and scalable state machine manager, which can help developers realize the need for persistent state machine logic.Through the state machine manager, the state can be consistent at the state between nodes, and then maintain the consistency of the entire system. Example code: StateManageable StateManager = New Statemanager (); // Create a state machine manager stateManager.registerState ("Count", new countate ()); // // Execute the operation on the state machine manager stateManager.setState ("Count", 10); // Set the initial state of the state machine StateManager.UpdatesState ("Count", 5); // Update status int counter = stateManager.getState ("counter"); // 3. Coordinator election In distributed systems, in order to ensure the availability and fault tolerance of the system, a coordinated node is usually required to manage the consistency of the system.Libraft Core provides a reality of a coordinator election, which can automatically elect the new coordinated node when the node fails to ensure the stability of the system. Example code: ElectionCoordInator ElectionCoordinator = New ElectionCoordinator (); // Create an election coordinator ElectionCoordInator.startElection (); // Start the election new coordination node // Execute operations on the election coordinator ElectionCoordinator.registerNode (nodeid); // Register node ElectionCoordinator.ProcessEvent (Event); // Treatment of election events Node Leader = ElectionCoordinator.getCurrentLeader (); // Get the current coordination node Fourth, log copy and synchronization Libraft Core implements the mechanism of log replication and synchronization to ensure that the logs between each node are consistent.Through log replication and synchronization, Libraft Core realizes the persistence and fault tolerance of the system and ensure the consistency of the system. Example code: Logreplicator Replicator = New Logreplicator (); // Create a log copywriter replicator.replicate (log); // Copy logs to other nodes // Execute the operation on the log copywriter replicator.registerNode (nodeid); // Register node replicator.processLog (log); // process logs boolean isSYNCED = replicator.isSyNced (); // determine whether the node is synchronized 5. Communication and message transmission Libraft Core provides support for communication and message transmission to ensure that the information between each node can be passed and communicated normally.Through the communication mechanism provided by Libraft Core, the node can conduct information exchanges in real time to maintain the consistency of the system. Example code: Communicator Communicator = New Communicator (); // Create a communicator Communicator.sendmessage (message); // Send message to other nodes // Execute the operation on the communicator Communicator.registerNode (nodeid); // Register node Communicator.ProcessMessage (Message); // process the receiving message List <message> Messages = Communicator.getMessages (); // Get the message list to be processed To sum up, the Libraft Core framework provides a series of functional Java class libraries to simplify the development and management of distributed consistency systems.Developers can use these functions according to specific needs to improve the performance, reliability and maintenance of distributed systems. The above is just a brief introduction to the functions provided by Libraft Core, and some example code is attached.Readers can in -depth research on the document and source code of libraft core according to the actual situation to better understand and apply the framework.