io.github.bucket4j.postgresql

Class PostgreSQLSelectForUpdateBasedProxyManager

java.lang.Object

io.github.bucket4j.distributed.proxy.AbstractProxyManager<K>

io.github.bucket4j.distributed.proxy.generic.select_for_update.AbstractSelectForUpdateBasedProxyManager<Long>

io.github.bucket4j.postgresql.PostgreSQLSelectForUpdateBasedProxyManager

All Implemented Interfaces:

ProxyManager<Long>

public class PostgreSQLSelectForUpdateBasedProxyManager
extends AbstractSelectForUpdateBasedProxyManager<Long>

Author:

Maxim Bartkov The extension of Bucket4j library addressed to support PostgreSQL To start work with the PostgreSQL extension you must create a table, which will include the possibility to work with buckets In order to do this, your table should include the next columns: id as a PRIMARY KEY (BIGINT) and state (BYTEA) To define column names, SQLProxyConfiguration include BucketTableSettings which takes settings for the table to work with Bucket4j.

This implementation solves transaction related problems via Based on SELECT FOR UPDATE SQL syntax. This prevents them from being modified or deleted by other transactions until the current transaction ends. That is, other transactions that attempt UPDATE, DELETE, or SELECT FOR UPDATE of these rows will be blocked until the current transaction ends. Also, if an UPDATE, DELETE, or SELECT FOR UPDATE from another transaction has already locked a selected row or rows, SELECT FOR UPDATE will wait for the other transaction to complete, and will then lock and return the updated row (or no row, if the row was deleted). Within a SERIALIZABLE transaction, however, an error will be thrown if a row to be locked has changed since the transaction started.

See Also:

SQLProxyConfigurationBuilder} to get more information how to build {@link SQLProxyConfiguration}

Constructor Summary

Constructors

Constructor and Description
PostgreSQLSelectForUpdateBasedProxyManager(SQLProxyConfiguration configuration)

Method Summary

Modifier and Type	Method and Description
protected SelectForUpdateBasedTransaction	allocateTransaction(Long key)
void	removeProxy(Long key)

Methods inherited from class io.github.bucket4j.distributed.proxy.generic.select_for_update.AbstractSelectForUpdateBasedProxyManager

execute, executeAsync, isAsyncModeSupported, removeAsync

Methods inherited from class io.github.bucket4j.distributed.proxy.AbstractProxyManager

asAsync, builder, getBackwardCompatibilityVersion, getClientSideConfig, getClientSideTime, getProxyConfiguration

Methods inherited from class java.lang.Object

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

Constructor Detail

PostgreSQLSelectForUpdateBasedProxyManager

public PostgreSQLSelectForUpdateBasedProxyManager(SQLProxyConfiguration configuration)

Parameters:

configuration - SQLProxyConfiguration configuration.

Method Detail

allocateTransaction

protected SelectForUpdateBasedTransaction allocateTransaction(Long key)

Specified by:

allocateTransaction in class AbstractSelectForUpdateBasedProxyManager<Long>

removeProxy

public void removeProxy(Long key)