Package org.apache.iotdb.db.wal.buffer

Class WALEntry

java.lang.Object

org.apache.iotdb.db.wal.buffer.WALEntry

All Implemented Interfaces:

SerializedSize

Direct Known Subclasses:

WALInfoEntry, WALSignalEntry

public abstract class WALEntry
extends java.lang.Object
implements SerializedSize

WALEntry is the basic element of .wal file, including type, memTable id, and specific value(physical plan or memTable snapshot).

Field Summary

Fields

Modifier and Type	Field	Description
protected long	memTableId	memTable id
protected WALEntryType	type	type of value
protected WALEntryValue	value	value(physical plan or memTable snapshot)
protected WALFlushListener	walFlushListener	listen whether this WALEntry has been written to the filesystem, null iff this WALEntry is deserialized from .wal file

Constructor Summary

Constructors

Modifier	Constructor	Description
	WALEntry(long memTableId, WALEntryValue value, boolean wait)
protected	WALEntry(WALEntryType type, long memTableId, WALEntryValue value, boolean wait)

Method Summary

Modifier and Type	Method	Description
static WALEntry	deserialize(java.io.DataInputStream stream)
static PlanNode	deserializeForConsensus(java.nio.ByteBuffer buffer)	This deserialization method is only for multi-leader consensus and just deserializes InsertRowNode and InsertTabletNode
boolean	equals(java.lang.Object obj)
long	getMemTableId()
WALEntryType	getType()
WALEntryValue	getValue()
WALFlushListener	getWalFlushListener()
abstract boolean	isSignal()
abstract void	serialize(IWALByteBufferView buffer)

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.iotdb.db.utils.SerializedSize

serializedSize

Field Detail

type

protected final WALEntryType type

type of value

memTableId

protected final long memTableId

memTable id

value

protected final WALEntryValue value

value(physical plan or memTable snapshot)

walFlushListener

protected final WALFlushListener walFlushListener

listen whether this WALEntry has been written to the filesystem, null iff this WALEntry is deserialized from .wal file

Constructor Detail

WALEntry

public WALEntry(long memTableId,
                WALEntryValue value,
                boolean wait)

WALEntry

protected WALEntry(WALEntryType type,
                   long memTableId,
                   WALEntryValue value,
                   boolean wait)

Method Detail

serialize

public abstract void serialize(IWALByteBufferView buffer)

deserialize

public static WALEntry deserialize(java.io.DataInputStream stream)
                            throws org.apache.iotdb.commons.exception.IllegalPathException,
                                   java.io.IOException

Throws:

org.apache.iotdb.commons.exception.IllegalPathException

java.io.IOException

deserializeForConsensus

public static PlanNode deserializeForConsensus(java.nio.ByteBuffer buffer)

This deserialization method is only for multi-leader consensus and just deserializes InsertRowNode and InsertTabletNode

equals

public boolean equals(java.lang.Object obj)

Overrides:

equals in class java.lang.Object

getType

public WALEntryType getType()

getMemTableId

public long getMemTableId()

getValue

public WALEntryValue getValue()

getWalFlushListener

public WALFlushListener getWalFlushListener()

isSignal

public abstract boolean isSignal()