IdentityManagerMultiplexerImpl.java
/*
** Module : IdentityManagerMultiplexerImpl.java
** Abstract : Handles server-to-server requests for record identity management
**
** Copyright (c) 2004-2024, Golden Code Development Corporation.
**
** -#- -I- --Date-- --JPRM-- -----------------------------------Description-----------------------------------
** 001 SVL 20080111 @36794 Created initial version. Handles server to server requests for record
** identity management.
** 002 SVL 20080901 @39650 Added reclaimKeys() function.
** 003 ECF 20200906 New ORM implementation.
** 004 OM 20241128 Multi-tenant runtime support: selected the proper persistence context, eventually
** based on [sharedDb] parameter.
*/
/*
** This program is free software: you can redistribute it and/or modify
** it under the terms of the GNU Affero General Public License as
** published by the Free Software Foundation, either version 3 of the
** License, or (at your option) any later version.
**
** This program is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
** GNU Affero General Public License for more details.
**
** You may find a copy of the GNU Affero GPL version 3 at the following
** location: https://www.gnu.org/licenses/agpl-3.0.en.html
**
** Additional terms under GNU Affero GPL version 3 section 7:
**
** Under Section 7 of the GNU Affero GPL version 3, the following additional
** terms apply to the works covered under the License. These additional terms
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** Affero GPL version 3 and may not be removed by you.
**
** 0. Attribution Requirement.
**
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*/
package com.goldencode.p2j.persist.remote;
import com.goldencode.p2j.persist.id.*;
import com.goldencode.p2j.persist.*;
import com.goldencode.p2j.net.*;
/**
* A singleton instance of this class services server-to-server requests for
* database identity management. This instance is registered as a remote
* object and serves identity management requests for one or more databases
* which the server authoritatively manages.
* <p>
* Service requests may originate from more than one external server, so this
* implementation is threadsafe.
*
* @author SVL
*/
public final class IdentityManagerMultiplexerImpl
extends DatabaseMultiplexer<IdentityManager>
implements IdentityManagerMultiplexer
{
/** Singleton instance of this class */
private static IdentityManagerMultiplexer instance = null;
/**
* Initialize the identity multiplexer for this server instance. This
* method is to be called during server bootstrap, but not before the local
* database manager has been initialized.
* <p>
* This method enforces the singleton pattern.
*
* @throws IllegalStateException
* if this method is invoked more than once.
*/
public static synchronized void initialize()
{
if (instance != null)
{
throw new IllegalStateException(
"Identity multiplexer already initialized for this process");
}
instance = new IdentityManagerMultiplexerImpl();
RemoteObject.registerNetworkServer(IdentityManagerMultiplexer.class,
instance);
}
/**
* Default constructor which initializes the resources needed for this
* multiplexer to service identity manager requests.
*/
private IdentityManagerMultiplexerImpl()
{
super();
}
/**
* Return the next primary key for the specified table.
*
* @param database
* Value that uniquely identifies the target database on the
* remote server.
*
* @param table
* Table for which the next primary key will be returned.
*
* @return The next primary key for the given table.
*
* @throws PersistenceException
* if there is an error determining the next primary key ID.
*/
public Long nextPrimaryKey(int database, String table)
throws PersistenceException
{
return lookupWorker(database).nextPrimaryKey(table);
}
/**
* Inform the identity manager that the given primary keys can be reused.
*
* @param database
* Value that uniquely identifies the target database on the
* remote server.
*
* @param keys
* Keys for reuse.
*/
public void reclaimKeys(int database, Long[] keys)
{
lookupWorker(database).reclaimKeys(keys);
}
/**
* Get the identity manager which is associated with the given database.
*
* @param database
* Physical database with which the returned worker is associated.
*
* @return Worker object to which service requests associated with the
* given database must be delegated.
*/
protected IdentityManager getWorker(Database database)
{
Persistence p = PersistenceFactory.getInstance(database);
return p.getIdentityManager(!database.isTenant());
}
}