mil.nga.geopackage.user

Class UserRowSync<TColumn extends UserColumn,TTable extends UserTable<TColumn>,TRow extends UserCoreRow<TColumn,TTable>>

java.lang.Object

mil.nga.geopackage.user.UserRowSync<TColumn,TTable,TRow>

Type Parameters:

TColumn - column type

TTable - table type

TRow - row type

public class UserRowSync<TColumn extends UserColumn,TTable extends UserTable<TColumn>,TRow extends UserCoreRow<TColumn,TTable>>
extends Object

User Row Sync to support sharing a single user row read copy when multiple near simultaneous asynchronous requests are made

Since:

2.0.0

Author:

osbornb

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
protected class	UserRowSync.RowCondition Condition and row wrapper

Field Summary

Fields

Modifier and Type	Field and Description
protected Lock	lock Synchronous lock
protected Map<Long,UserRowSync.RowCondition>	rows Mapping between row ids and row conditions

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	UserRowSync() Constructor

Method Summary

Modifier and Type	Method and Description
TRow	getRowOrLock(long id) Get the row if another same id request has been made by waiting until the row has been set.
void	setRow(long id, TRow row) Set the row id, row, and notify all waiting threads to retrieve the row.

Methods inherited from class java.lang.Object

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

Field Detail

lock

protected Lock lock

Synchronous lock

rows

protected Map<Long,UserRowSync.RowCondition> rows

Mapping between row ids and row conditions

Constructor Detail

UserRowSync

protected UserRowSync()

Constructor

Method Detail

getRowOrLock

public TRow getRowOrLock(long id)

Get the row if another same id request has been made by waiting until the row has been set. If no current request, lock the for the calling thread which should read the row and call setRow(long, UserCoreRow) when complete.

Parameters:

id - user row id

Returns:

row if retrieved from a previous request, null if calling thread should read row and set using setRow(long, UserCoreRow)

setRow

public void setRow(long id,
                   TRow row)

Set the row id, row, and notify all waiting threads to retrieve the row.

Parameters:

id - user row id

row - user row or null