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Java Source Code / Java Documentation » Database DBMS » db4o 6.4 » com.db4o

Source Cross Reference

Class Diagram

Java Document (Java Doc)

com.db4o .ObjectServer

All known Subclasses:   com.db4o.internal.cs .ObjectServerImpl,
ObjectServer
public interface ObjectServer (Code)
the db4o server interface.

- db4o servers can be opened with Db4o.openServer(Stringint) .
- Direct in-memory connections to servers can be made with ObjectServer.openClient()
- TCP connections are available through Db4o.openClient(StringintStringString) .

Before connecting clients over TCP, you have to ObjectServer.grantAccess(String,String) to the username and password combination that you want to use.
See Also:   Db4o.openServer(java.lang.Stringint)
See Also:    Db4o.openServer
See Also:   ExtObjectServer
See Also:    ExtObjectServer for extended functionality

Method Summary
public boolean close()
     closes the ObjectServer and writes all cached data.
public ExtObjectServer ext()
     returns an ObjectServer with extended functionality.

Use this method as a convenient accessor to extended methods.
public void grantAccess(String userName, String password)
     grants client access to the specified user with the specified password.
public ObjectContainer openClient()
     opens a client against this server.

A client opened with this method operates within the same VM as the server.
public ObjectContainer openClient(Configuration config)


Method Detail
close
public boolean close()(Code)
closes the ObjectServer and writes all cached data.

true - denotes that the last instance connected to theused database file was closed.

ext
public ExtObjectServer ext()(Code)
returns an ObjectServer with extended functionality.

Use this method as a convenient accessor to extended methods. Every ObjectServer can be casted to an com.db4o.ext.ExtObjectServer .

The functionality is split to two interfaces to allow newcomers to focus on the essential methods.

grantAccess
public void grantAccess(String userName, String password)(Code)
grants client access to the specified user with the specified password.

If the user already exists, the password is changed to the specified password.

Parameters:
  userName - the name of the user
Parameters:
  password - the password to be used

openClient
public ObjectContainer openClient()(Code)
opens a client against this server.

A client opened with this method operates within the same VM as the server. Since an embedded client can use direct communication, without an in-between socket connection, performance will be better than a client opened with Db4o.openClient(java.lang.Stringintjava.lang.Stringjava.lang.String)

Every client has it's own transaction and uses it's own cache for it's own version of all peristent objects.

openClient
public ObjectContainer openClient(Configuration config)(Code)
See ObjectServer.openClient()
Parameters:
  config - a custom Configuration Configuration instance to be obtained via Db4o.newConfiguration an open ObjectContainer ObjectContainer

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