com.arjuna.ats.arjuna.coordinator

Class ActionHierarchy

java.lang.Object

com.arjuna.ats.arjuna.coordinator.ActionHierarchy

public class ActionHierarchy
extends Object

Class that represents the transaction hierarchy. This class can cope with transaction hierarchies of arbitrary depth.

Since:

1.0.

Version:

$Id: ActionHierarchy.java 2342 2006-03-30 13:06:17Z $

Author:

Mark Little ([email protected])

Field Summary

Fields

Modifier and Type	Field and Description
static int	DEFAULT_HIERARCHY_DEPTH

Constructor Summary

Constructors

Constructor and Description
ActionHierarchy(ActionHierarchy theCopy) Create a new copy of the specified transaction hierarchy.
ActionHierarchy(int depth) Create a new (blank) hierarchy with sufficient space for the specified number of transactions.

Method Summary

Modifier and Type	Method and Description
boolean	add(Uid actionId) Insert new entry growing table as needed.
boolean	add(Uid actionId, int at) Add the transaction id at the specified level.
void	copy(ActionHierarchy c) Create a copy of the specified transaction hierarchy.
int	depth() Returns the current depth of the hierarchy.
boolean	equals(ActionHierarchy other) Overloads Object.equals.
int	findCommonPrefix(ActionHierarchy oldHierarchy) Find common prefix in two hierarchies.
void	forgetDeepest() Remove the deepest nested transaction from the hierarchy.
com.arjuna.ats.arjuna.coordinator.ActionInfo	getActionInfo(int typeIndex)
Uid	getActionUid(int typeIndex)
Uid	getDeepestActionUid() Returns the transaction id of the most deeply nested transaction.
boolean	isAncestor(Uid target) Scan hierarchy looking for a particular Uid starting at deepest and going up.
void	pack(OutputBuffer state) Pack the hierarchy into the buffer.
void	print(PrintWriter strm) Print out the transaction hierarchy.
void	unpack(InputBuffer state) CAREFULLY unpack the 'new' hierarchy.

Methods inherited from class java.lang.Object

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

Field Detail

DEFAULT_HIERARCHY_DEPTH

public static final int DEFAULT_HIERARCHY_DEPTH

See Also:

Constant Field Values

Constructor Detail

ActionHierarchy

public ActionHierarchy(int depth)

Create a new (blank) hierarchy with sufficient space for the specified number of transactions. Once this space is exhausted, additional space will be obtained dynamically.

ActionHierarchy

public ActionHierarchy(ActionHierarchy theCopy)

Create a new copy of the specified transaction hierarchy.

Method Detail

print

public void print(PrintWriter strm)

Print out the transaction hierarchy.

copy

public void copy(ActionHierarchy c)

Create a copy of the specified transaction hierarchy. Any hierarchy currently maintained by this object will be lost in favour of the new hierarchy. We check for self-assignment.

equals

public final boolean equals(ActionHierarchy other)

Overloads Object.equals.

add

public final boolean add(Uid actionId)

Insert new entry growing table as needed. Transaction id will be added as a top-level transaction.

Returns:

true if successful, false otherwise.

add

public final boolean add(Uid actionId,
                         int at)

Add the transaction id at the specified level.

Returns:

true if successful, false otherwise.

isAncestor

public final boolean isAncestor(Uid target)

Scan hierarchy looking for a particular Uid starting at deepest and going up. Do NOT go past any top level action.

Returns:

true if is ancestor, false otherwise.

pack

public void pack(OutputBuffer state)
          throws IOException

Pack the hierarchy into the buffer.

Throws:

IOException

unpack

public void unpack(InputBuffer state)
            throws IOException

CAREFULLY unpack the 'new' hierarchy. We unpack into a temporary to ensure that the current hierarchy is not corrupted.

Throws:

IOException

forgetDeepest

public final void forgetDeepest()

Remove the deepest nested transaction from the hierarchy.

findCommonPrefix

public final int findCommonPrefix(ActionHierarchy oldHierarchy)

Find common prefix in two hierarchies.

Returns:

the index of the first common ancestor.

depth

public final int depth()

Returns the current depth of the hierarchy.

Returns:

the hierarchy depth.

getDeepestActionUid

public final Uid getDeepestActionUid()

Returns the transaction id of the most deeply nested transaction.

Returns:

the Uid of the deepest transaction.

getActionUid

public final Uid getActionUid(int typeIndex)

Returns:

the identity of the transaction at the specified level in the hierarchy.

getActionInfo

public final com.arjuna.ats.arjuna.coordinator.ActionInfo getActionInfo(int typeIndex)

Returns:

the ActionInfo for the transaction at the specified level. ActionInfo is not a public class so this is of limited use outside of the transaction system.