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Java Source Code / Java Documentation » Database DBMS » mckoi » com.mckoi.database

Source Cross Reference

Class Diagram

Java Document (Java Doc)

java.lang .Object

com.mckoi.database .TransactionJournal

TransactionJournal

final class TransactionJournal (Code)

The list of all primitive operations to the database that a transaction performed. It includes the list of all rows added or removed to all tables, and the tables created and dropped and any table that had constraint modifications.

This journal is updated inside a Transaction. When the transaction is completed, this journal is used both to determine if the transaction can be committed, and also to update the changes to the data that a transaction has made.

THREADING: The journal update commands are synchronized because they need to be atomic operations and can be accessed by multiple threads.
author:
Tobias Downer

Field Summary
static byte	TABLE_ADD Journal commands.
static byte	TABLE_CONSTRAINT_ALTER
static byte	TABLE_CREATE
static byte	TABLE_DROP
static byte	TABLE_REMOVE

Constructor Summary
	TransactionJournal() Constructs a blank journal.

Method Summary
synchronized void	entryAddTableRow(int table_id, int row_index) Makes a journal entry that a table entry has been added to the table with the given id.
synchronized void	entryAddTouchedTable(int table_id) Logs in this journal that the transaction touched the given table id.
synchronized void	entryRemoveTableRow(int table_id, int row_index) Makes a journal entry that a table entry has been removed from the table with the given id.
synchronized void	entryTableConstraintAlter(int table_id) Makes a journal entry that a table with the given 'table_id' has been altered by this transaction.
synchronized void	entryTableCreate(int table_id) Makes a journal entry that a table with the given 'table_id' has been created by this transaction.
synchronized void	entryTableDrop(int table_id) Makes a journal entry that a table with the given 'table_id' has been dropped by this transaction.
IntegerVector	getTablesConstraintAltered() Returns the list of tables id's that were constraint altered by this journal.
IntegerVector	getTablesCreated() Returns the list of tables id's that were created by this journal.
IntegerVector	getTablesDropped() Returns the list of tables id's that were dropped by this journal.
MasterTableJournal[]	makeMasterTableJournals() Generates an array of MasterTableJournal objects that specify the changes that occur to each table affected by this transaction.

Field Detail

TABLE_ADD
static byte TABLE_ADD(Code)
	Journal commands.

TABLE_CONSTRAINT_ALTER
static byte TABLE_CONSTRAINT_ALTER(Code)

TABLE_CREATE
static byte TABLE_CREATE(Code)

TABLE_DROP
static byte TABLE_DROP(Code)

TABLE_REMOVE
static byte TABLE_REMOVE(Code)

Constructor Detail

TransactionJournal
TransactionJournal()(Code)
	Constructs a blank journal.

Method Detail

entryAddTableRow
synchronized void entryAddTableRow(int table_id, int row_index)(Code)
	Makes a journal entry that a table entry has been added to the table with the given id.

entryAddTouchedTable
synchronized void entryAddTouchedTable(int table_id)(Code)
	Logs in this journal that the transaction touched the given table id.

entryRemoveTableRow
synchronized void entryRemoveTableRow(int table_id, int row_index)(Code)
	Makes a journal entry that a table entry has been removed from the table with the given id.

entryTableConstraintAlter
synchronized void entryTableConstraintAlter(int table_id)(Code)
	Makes a journal entry that a table with the given 'table_id' has been altered by this transaction.

entryTableCreate
synchronized void entryTableCreate(int table_id)(Code)
	Makes a journal entry that a table with the given 'table_id' has been created by this transaction.

entryTableDrop
synchronized void entryTableDrop(int table_id)(Code)
	Makes a journal entry that a table with the given 'table_id' has been dropped by this transaction.

getTablesConstraintAltered
IntegerVector getTablesConstraintAltered()(Code)
	Returns the list of tables id's that were constraint altered by this journal.

getTablesCreated
IntegerVector getTablesCreated()(Code)
	Returns the list of tables id's that were created by this journal.

getTablesDropped
IntegerVector getTablesDropped()(Code)
	Returns the list of tables id's that were dropped by this journal.

makeMasterTableJournals

MasterTableJournal[] makeMasterTableJournals()(Code)

Generates an array of MasterTableJournal objects that specify the changes that occur to each table affected by this transaction. Each array element represents a change to an individual table in the conglomerate that changed as a result of this transaction.

This is used when a transaction successfully commits and we need to log the transaction changes with the master table.

If no changes occurred to a table, then no entry is returned here.

Methods inherited from java.lang.Object

native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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