org.apache.ignite.internal.processors.cache.mvcc

Class DeadlockProbe

java.lang.Object

org.apache.ignite.internal.processors.cache.mvcc.DeadlockProbe

All Implemented Interfaces:

Serializable, Message

public class DeadlockProbe
extends Object
implements Message

Probe message travelling between transactions (from waiting to blocking) during deadlock detection.

See Also:

DeadlockDetectionManager, Serialized Form

Field Summary

Fields inherited from interface org.apache.ignite.plugin.extensions.communication.Message

DIRECT_TYPE_SIZE

Constructor Summary

Constructors

Constructor and Description
DeadlockProbe()
DeadlockProbe(GridCacheVersion initiatorVer, Collection<ProbedTx> waitChain, ProbedTx blocker, boolean nearCheck)

Method Summary

Modifier and Type	Method and Description
ProbedTx	blocker()
short	directType() Gets message type.
byte	fieldsCount() Gets fields count.
GridCacheVersion	initiatorVersion()
boolean	nearCheck()
void	onAckReceived() Method called when ack message received.
boolean	readFrom(ByteBuffer buf, MessageReader reader) Reads this message from provided byte buffer.
String	toString()
Collection<ProbedTx>	waitChain()
boolean	writeTo(ByteBuffer buf, MessageWriter writer) Writes this message to provided byte buffer.

Methods inherited from class java.lang.Object

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

Constructor Detail

DeadlockProbe

public DeadlockProbe()

DeadlockProbe

public DeadlockProbe(GridCacheVersion initiatorVer,
                     Collection<ProbedTx> waitChain,
                     ProbedTx blocker,
                     boolean nearCheck)

Method Detail

initiatorVersion

public GridCacheVersion initiatorVersion()

Returns:

Identifier of a transaction started a deadlock detection process. Can be used for diagnostics.

waitChain

public Collection<ProbedTx> waitChain()

Returns:

Chain of transactions identified as waiting during deadlock detection.

blocker

public ProbedTx blocker()

Returns:

Identifier of a transaction identified as blocking last transaction in the wait chain during deadlock deteciton.

nearCheck

public boolean nearCheck()

Returns:

True if checks if near transaction is waiting. False if checks dht transaction.

writeTo

public boolean writeTo(ByteBuffer buf,
                       MessageWriter writer)

Writes this message to provided byte buffer.

Specified by:

writeTo in interface Message

Parameters:

buf - Byte buffer.

writer - Writer.

Returns:

Whether message was fully written.

readFrom

public boolean readFrom(ByteBuffer buf,
                        MessageReader reader)

Reads this message from provided byte buffer.

Specified by:

readFrom in interface Message

Parameters:

buf - Byte buffer.

reader - Reader.

Returns:

Whether message was fully read.

directType

public short directType()

Gets message type.

Specified by:

directType in interface Message

Returns:

Message type.

fieldsCount

public byte fieldsCount()

Gets fields count.

Specified by:

fieldsCount in interface Message

Returns:

Fields count.

onAckReceived

public void onAckReceived()

Method called when ack message received.

Specified by:

onAckReceived in interface Message

toString

public String toString()

Overrides:

toString in class Object