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org.apache.derby.impl.store.raw.data
Class ContainerActionOnCommit  

java.lang.Object
  org.apache.derby.impl.store.raw.data.ContainerActionOnCommit

All Implemented Interfaces:

java.util.Observer

Direct Known Subclasses:

ContainerHandleActionOnCommit, DropOnCommit

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abstract class ContainerActionOnCommit

extends java.lang.Object

implements java.util.Observer

An Observer that can be attached to a transaction to implement some action when the transaction commits or rollsback in some way.

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Field Summary
protected  org.apache.derby.iapi.store.raw.ContainerKey	identity

 

Constructor Summary
protected	ContainerActionOnCommit(org.apache.derby.iapi.store.raw.ContainerKey identity)

 

Method Summary
boolean	equals(java.lang.Object other)           An equals method that returns true if the other obejct is a sub-class of this, and the container identities are equal *and* it is the same class as this.
int	hashCode()           Get a value that represents this Object, as uniquely as possible within the confines of an int.

 

Methods inherited from class java.lang.Object

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

 

Methods inherited from interface java.util.Observer

update

 

Field Detail

identity

protected org.apache.derby.iapi.store.raw.ContainerKey identity

Constructor Detail

ContainerActionOnCommit

protected ContainerActionOnCommit(org.apache.derby.iapi.store.raw.ContainerKey identity)

Method Detail

hashCode

public int hashCode()

Description copied from class: java.lang.Object

Get a value that represents this Object, as uniquely as possible within the confines of an int.

There are some requirements on this method which subclasses must follow:

• Semantic equality implies identical hashcodes. In other words, if a.equals(b) is true, then a.hashCode() == b.hashCode() must be as well. However, the reverse is not necessarily true, and two objects may have the same hashcode without being equal.
• It must be consistent. Whichever value o.hashCode() returns on the first invocation must be the value returned on all later invocations as long as the object exists. Notice, however, that the result of hashCode may change between separate executions of a Virtual Machine, because it is not invoked on the same object.

Notice that since hashCode is used in java.util.Hashtable and other hashing classes, a poor implementation will degrade the performance of hashing (so don't blindly implement it as returning a constant!). Also, if calculating the hash is time-consuming, a class may consider caching the results.

The default implementation returns System.identityHashCode(this)

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equals

public boolean equals(java.lang.Object other)

An equals method that returns true if the other obejct is a sub-class of this, and the container identities are equal *and* it is the same class as this.
This allows mutiple additions of value equality obejcts to the observer list while only retaining one.

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Overview  Package   Class  Use  Deprecated  Index
Home >> All >> org >> apache >> derby >> impl >> store >> raw >> [ data overview ]	PREV CLASS  NEXT CLASS
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