Package com.tailf.ha

Package for setup and control of High Availability cluster nodes.

See: Description

Class Summary

Class	Description
Ha	Main class for the HA cluster management.
HaStatus	This class represents a status for a HA node in a HA cluster.

Enum Summary

Enum	Description
HaOrderType	enum for the different HA cluster protocol operations Used internally by the api.
HaStateType	This enum describes the different states a HA node can be in.

Exception Summary

Exception	Description
HaException	Exception for the HA handling

Package com.tailf.ha Description

Package for setup and control of High Availability cluster nodes. This package is used to connect to the High Availability (HA) subsystem. Configuration data can then be replicated on several nodes in a cluster.

Example: We set up three nodes in a HA cluster set one as master and the other two as slaves and afterwards check their state.

  Socket s0 = new Socket("localhost", 4565);
  Socket s1 = new Socket("localhost", 4575);
  Socket s2 = new Socket("localhost", 4585);

  Ha ha0 = new Ha(s0, "clus0");
  Ha ha1 = new Ha(s1, "clus0");
  Ha ha2 = new Ha(s2, "clus0");

  ConfHaNode master =
      new ConfHaNode(new ConfBuf("node0"),
                     new ConfIPv4(InetAddress.getByName("localhost")));


  ha0.beMaster(master.nodeid);
  Thread.sleep(500);

  ha1.beSlave(new ConfBuf("node1"), master, true);
  Thread.sleep(500);

  ha2.beSlave(new ConfBuf("node2"), master, true);
  Thread.sleep(500);

  HaStatus status0 = ha0.status();
  HaStatus status1 = ha1.status();
  HaStatus status2 = ha2.status();