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JGroups RAFT implementation

There is a newer version: 1.0.14.Final

package org.jgroups.protocols.raft;

import org.jgroups.Address;
import org.jgroups.util.ExtendedUUID;
import org.jgroups.raft.util.RequestTable;
import org.jgroups.util.Util;

/**
 * Implements the behavior of a RAFT leader
 * @author Bela Ban
 * @since  0.1
 */
public class Leader extends RaftImpl {
    public Leader(RAFT raft) {
        super(raft);
    }


    public void init() {
        super.init();
        raft.createRequestTable();
        raft.createCommitTable();
        raft.startResendTask();
    }

    public void destroy() {
        super.destroy();
        raft.stopResendTask();
        raft.request_table=null;
        raft.commit_table=null;
    }


    @Override
    protected void handleAppendEntriesResponse(Address sender, int term, AppendResult result) {
        RequestTable reqtab=raft.request_table;
        if(reqtab == null)
            throw new IllegalStateException("request table cannot be null in leader");
        ExtendedUUID uuid=(ExtendedUUID)sender;
        String sender_raft_id=Util.bytesToString(uuid.get(RAFT.raft_id_key));
        raft.getLog().trace("%s: received AppendEntries response from %s for term %d: %s", raft.local_addr, sender, term, result);
        if(result.success) {
            raft.commit_table.update(sender, result.getIndex(), result.getIndex()+1, result.commit_index, false);
            if(reqtab.add(result.index, sender_raft_id, raft.majority()))
                raft.handleCommit(result.index);
        }
        else
            raft.commit_table.update(sender, 0, result.getIndex(), result.commit_index, true);
    }

}