Package org.apache.iotdb.db.wal.allocation

Class FirstCreateStrategy

java.lang.Object

org.apache.iotdb.db.wal.allocation.AbstractNodeAllocationStrategy

org.apache.iotdb.db.wal.allocation.FirstCreateStrategy

All Implemented Interfaces:

NodeAllocationStrategy

public class FirstCreateStrategy
extends AbstractNodeAllocationStrategy

This strategy creates one wal node for each unique identifier. In other words, each identifier (like data region) has its own wal node.

Field Summary

Fields inherited from class org.apache.iotdb.db.wal.allocation.AbstractNodeAllocationStrategy

folderManager

Constructor Summary

Constructors

Constructor	Description
FirstCreateStrategy()

Method Summary

Modifier and Type	Method	Description
IWALNode	applyForWALNode(java.lang.String applicantUniqueId)	Allocate one wal node for the applicant
void	clear()
void	deleteWALNode(java.lang.String applicantUniqueId)
java.util.List<WALNode>	getNodesSnapshot()	Get all wal nodes
void	registerWALNode(java.lang.String applicantUniqueId, java.lang.String logDirectory, long startFileVersion, long startSearchIndex)

Methods inherited from class org.apache.iotdb.db.wal.allocation.AbstractNodeAllocationStrategy

createWALNode, createWALNode, createWALNode

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

FirstCreateStrategy

public FirstCreateStrategy()

Method Detail

applyForWALNode

public IWALNode applyForWALNode(java.lang.String applicantUniqueId)

Description copied from interface: NodeAllocationStrategy

Allocate one wal node for the applicant

registerWALNode

public void registerWALNode(java.lang.String applicantUniqueId,
                            java.lang.String logDirectory,
                            long startFileVersion,
                            long startSearchIndex)

deleteWALNode

public void deleteWALNode(java.lang.String applicantUniqueId)

getNodesSnapshot

public java.util.List<WALNode> getNodesSnapshot()

Description copied from interface: NodeAllocationStrategy

Get all wal nodes

clear

public void clear()