org.eclipse.persistence.sessions.server

Class ConnectionPolicy

java.lang.Object

org.eclipse.persistence.sessions.server.ConnectionPolicy

All Implemented Interfaces:

java.io.Serializable, java.lang.Cloneable

public class ConnectionPolicy
extends java.lang.Object
implements java.lang.Cloneable, java.io.Serializable

Purpose: Used to specify how a client session's should be allocated.

Description: The ConnectionPolicy is used to indicate how a client session will interact with the internal or external JDBC connection pool/data source. The default ConnectionPolicy is held on the ServerSession but this can be overridden for any specific client session when it is acquired.

See Also:

ServerSession.getDefaultConnectionPolicy(), ServerSession.acquireClientSession(ConnectionPolicy), ServerSession.acquireClientSession(ConnectionPolicy, Map), ClientSession.getConnectionPolicy(), Serialized Form

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	ConnectionPolicy.ExclusiveMode Default value Transactional causes creation of ClientSession, the other two values - ExclusiveIsolatedClientSession.

Field Summary

Fields

Modifier and Type	Field and Description
protected ConnectionPolicy.ExclusiveMode	exclusiveMode This attribute is used by the ServerSession to determine if a client session with an exclusive connection should be built and how the exclusive connection should be used.
protected boolean	isLazy Determines if the write/exclusive connection is acquired only when first requested (lazy, this is the default) or immediately when the client session is acquired.
protected Login	login The login information used to create a JDBC connection or acquire one from an external pool/data-source.
protected java.lang.String	poolName Name of the pool to be used.
protected java.util.Map	properties This attribute will provide a mechanism by which customers will be able to pass connection information to events to enable further customization.

Constructor Summary

Constructors

Constructor and Description
ConnectionPolicy() PUBLIC: A connection policy is used to define how the client session connection should be acquired.
ConnectionPolicy(Login login) PUBLIC: A connection policy is used to define how the client session connection should be acquired.
ConnectionPolicy(java.lang.String poolName) PUBLIC: A connection policy is used to define how the client session connection should be acquired.

Method Summary

Modifier and Type	Method and Description
java.lang.Object	clone() INTERNAL: Clone the query
void	dontUseLazyConnection() PUBLIC: A lazy connection only acquires a physical connection when a transaction is started and releases the connection when the transaction completes.
ConnectionPolicy.ExclusiveMode	getExclusiveMode() PUBLIC: Returns exclusive mode.
Login	getLogin() PUBLIC: Return the login to use for this connection.
java.lang.String	getPoolName() PUBLIC: Return the pool name or null if not part of a pool.
java.util.Map	getProperties() ADVANCED: This method will return the collection of custom properties set on the Connection policy.
java.lang.Object	getProperty(java.lang.Object object) PUBLIC: Returns the property associated with the corresponding key.
boolean	hasLogin() PUBLIC: Return if a login is used, only one of login and pool can be used.
boolean	hasProperties() PUBLIC: Returns true if properties are available on the Connection Policy
boolean	isExclusive() PUBLIC: Indicates whether ExclusiveIsolatedClientSession should be created.
boolean	isExclusiveAlways() PUBLIC: Indicates whether exclusiveMode is Always.
boolean	isExclusiveIsolated() PUBLIC: Indicates whether exclusiveMode is Isolated.
boolean	isLazy() PUBLIC: Return if a lazy connection should be used, a lazy connection only acquire a physical connection when a transaction is started and releases the connection when the transaction completes.
boolean	isPooled() INTERNAL: Return if part of a connection pool.
boolean	isUserDefinedConnection() INTERNAL: Return if part of a connection pool.
java.lang.Object	removeProperty(java.lang.Object key) PUBLIC: This method is used to remove a custom property from the Connection Policy.
void	setExclusiveMode(ConnectionPolicy.ExclusiveMode exclusiveMode) PUBLIC: Sets exclusive mode, if null is passed sets the default value.
void	setIsLazy(boolean isLazy) PUBLIC: Set if a lazy connection should be used, a lazy connection only acquire a physical connection when a transaction is started and releases the connection when the transaction completes.
void	setLogin(Login login) PUBLIC: Set the login to use for this connection.
void	setPoolName(java.lang.String poolName) PUBLIC: Set the pool name or null if not part of a pool.
void	setProperty(java.lang.Object key, java.lang.Object property) PUBLIC: Use this method to set custom properties on the Connection Policy.
void	setShouldUseExclusiveConnection(boolean useExclusiveConnection) Deprecated.
boolean	shouldUseExclusiveConnection() Deprecated.
java.lang.String	toString() INTERNAL: return a string representation of this ConnectionPolicy
void	useLazyConnection() PUBLIC: A lazy connection only acquires a physical connection when a transaction is started and releases the connection when the transaction completes.

Methods inherited from class java.lang.Object

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

Field Detail

login

protected Login login

The login information used to create a JDBC connection or acquire one from an external pool/data-source. Typically this is constant within a single persistence unit but in some advanced usages users can customize connections for each client session.

poolName

protected java.lang.String poolName

Name of the pool to be used. If neither pool name nor login provided then default pool will be used. If no pool name is provided but there's a login then the login is used to create connection which the ClientSession will use.

isLazy

protected boolean isLazy

Determines if the write/exclusive connection is acquired only when first requested (lazy, this is the default) or immediately when the client session is acquired. After write/exclusive connection is acquired if isLazy is true and exclusiveMode is Transactional then it's held until transaction is committed or rolled back, otherwise until the client session is released.

exclusiveMode

protected ConnectionPolicy.ExclusiveMode exclusiveMode

This attribute is used by the ServerSession to determine if a client session with an exclusive connection should be built and how the exclusive connection should be used.

properties

protected java.util.Map properties

This attribute will provide a mechanism by which customers will be able to pass connection information to events to enable further customization.

Constructor Detail

ConnectionPolicy

public ConnectionPolicy()

PUBLIC: A connection policy is used to define how the client session connection should be acquired.

ConnectionPolicy

public ConnectionPolicy(java.lang.String poolName)

PUBLIC: A connection policy is used to define how the client session connection should be acquired.

ConnectionPolicy

public ConnectionPolicy(Login login)

PUBLIC: A connection policy is used to define how the client session connection should be acquired.

Method Detail

clone

public java.lang.Object clone()

INTERNAL: Clone the query

Overrides:

clone in class java.lang.Object

dontUseLazyConnection

public void dontUseLazyConnection()

PUBLIC: A lazy connection only acquires a physical connection when a transaction is started and releases the connection when the transaction completes.

getLogin

public Login getLogin()

PUBLIC: Return the login to use for this connection. Client sessions support using a separate user login for database modification.

getPoolName

public java.lang.String getPoolName()

PUBLIC: Return the pool name or null if not part of a pool.

getProperties

public java.util.Map getProperties()

ADVANCED: This method will return the collection of custom properties set on the Connection policy. Note that this will cause the lazy initialization of the HashMap.

getProperty

public java.lang.Object getProperty(java.lang.Object object)

PUBLIC: Returns the property associated with the corresponding key. These properties will be available to connection events.

hasLogin

public boolean hasLogin()

PUBLIC: Return if a login is used, only one of login and pool can be used.

hasProperties

public boolean hasProperties()

PUBLIC: Returns true if properties are available on the Connection Policy

isExclusiveIsolated

public boolean isExclusiveIsolated()

PUBLIC: Indicates whether exclusiveMode is Isolated.

isExclusiveAlways

public boolean isExclusiveAlways()

PUBLIC: Indicates whether exclusiveMode is Always.

isExclusive

public boolean isExclusive()

PUBLIC: Indicates whether ExclusiveIsolatedClientSession should be created.

isLazy

public boolean isLazy()

PUBLIC: Return if a lazy connection should be used, a lazy connection only acquire a physical connection when a transaction is started and releases the connection when the transaction completes.

isPooled

public boolean isPooled()

INTERNAL: Return if part of a connection pool.

isUserDefinedConnection

public boolean isUserDefinedConnection()

INTERNAL: Return if part of a connection pool.

removeProperty

public java.lang.Object removeProperty(java.lang.Object key)

PUBLIC: This method is used to remove a custom property from the Connection Policy. This method will return the propery removed. If it was not found then null will be returned.

setIsLazy

public void setIsLazy(boolean isLazy)

PUBLIC: Set if a lazy connection should be used, a lazy connection only acquire a physical connection when a transaction is started and releases the connection when the transaction completes.

setLogin

public void setLogin(Login login)

PUBLIC: Set the login to use for this connection. Client sessions support using a separate user login for database modification. Pooled connections must use the pool's login and cannot define their own.

setPoolName

public void setPoolName(java.lang.String poolName)

PUBLIC: Set the pool name or null if not part of a pool.

setProperty

public void setProperty(java.lang.Object key,
                        java.lang.Object property)

PUBLIC: Use this method to set custom properties on the Connection Policy. These properties will be available from within connection events but have no effect on the connection directly.

getExclusiveMode

public ConnectionPolicy.ExclusiveMode getExclusiveMode()

PUBLIC: Returns exclusive mode.

setExclusiveMode

public void setExclusiveMode(ConnectionPolicy.ExclusiveMode exclusiveMode)

PUBLIC: Sets exclusive mode, if null is passed sets the default value.

setShouldUseExclusiveConnection

public void setShouldUseExclusiveConnection(boolean useExclusiveConnection)

Deprecated.

OBSOLETE: If set to true the acquired client session should acquire an exclusive connection for all database interaction. Currently this is only supported with Isolated data, but required for Oracle VPD support. This method has been replaced with setExclusiveMode method: true corresponds to ExclusiveMode.Isolated, false - to ExclusiveMode.Transactional.

shouldUseExclusiveConnection

public boolean shouldUseExclusiveConnection()

Deprecated.

OBSOLETE: Returns true if the acquired client session should acquire an exclusive connection for all database interaction. Currently this is only supported with Isolated data, but required for Oracle VPD support. This method has been replaced with isExclusiveIsolated method.

toString

public java.lang.String toString()

INTERNAL: return a string representation of this ConnectionPolicy

Overrides:

toString in class java.lang.Object

useLazyConnection

public void useLazyConnection()

PUBLIC: A lazy connection only acquires a physical connection when a transaction is started and releases the connection when the transaction completes.