io.github.bucket4j.postgresql

Class PostgreSQLadvisoryLockBasedProxyManager

java.lang.Object

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

io.github.bucket4j.distributed.proxy.generic.pessimistic_locking.AbstractLockBasedProxyManager<Long>

io.github.bucket4j.postgresql.PostgreSQLadvisoryLockBasedProxyManager

All Implemented Interfaces:

ProxyManager<Long>

public class PostgreSQLadvisoryLockBasedProxyManager
extends AbstractLockBasedProxyManager<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 pg_advisory_xact_lock locks an application-defined resource, which can be identified either by a single 64-bit key value or two 32-bit key values (note that these two key spaces do not overlap). If another session already holds a lock on the same resource identifier, this function will wait until the resource becomes available. The lock is exclusive. Multiple lock requests stack so that if the same resource is locked three times it must then be unlocked three times to be released for other sessions use. The lock is automatically released at the end of the current transaction and cannot be released explicitly.

See Also:

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

Constructor Summary

Constructors

Constructor and Description
PostgreSQLadvisoryLockBasedProxyManager(SQLProxyConfiguration configuration)

Method Summary

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

Methods inherited from class io.github.bucket4j.distributed.proxy.generic.pessimistic_locking.AbstractLockBasedProxyManager

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

PostgreSQLadvisoryLockBasedProxyManager

public PostgreSQLadvisoryLockBasedProxyManager(SQLProxyConfiguration configuration)

Parameters:

configuration - SQLProxyConfiguration configuration.

Method Detail

allocateTransaction

protected LockBasedTransaction allocateTransaction(Long key)

Specified by:

allocateTransaction in class AbstractLockBasedProxyManager<Long>

removeProxy

public void removeProxy(Long key)