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package oracle.toplink.essentials.threetier;
import java.util.*;
import java.io.*;
import oracle.toplink.essentials.internal.helper.*;
import oracle.toplink.essentials.sessions.Login;
import oracle.toplink.essentials.internal.localization.*;
/**
* <p>
* <b>Purpose</b>: Used to specify how a client session's should be allocated.
* @see ServerSession
*/
public class ConnectionPolicy implements Cloneable, Serializable {
protected Login login;
protected String poolName;
protected boolean isLazy;
/** This attribute provides a mechanism to pass connection information to events. */
protected Map properties;
/**
* PUBLIC:
* A connection policy is used to define how the client session connection should be acquired.
*/
public ConnectionPolicy() {
this.isLazy = true;
}
/**
* PUBLIC:
* A connection policy is used to define how the client session connection should be acquired.
*/
public ConnectionPolicy(String poolName) {
this.isLazy = true;
this.poolName = poolName;
}
/**
* PUBLIC:
* A connection policy is used to define how the client session connection should be acquired.
*/
public ConnectionPolicy(Login login) {
this.isLazy = false;
this.login = login;
}
/**
* INTERNAL:
* Clone the query
*/
public Object clone() {
try {
ConnectionPolicy clone = (ConnectionPolicy)super.clone();
if (clone.hasLogin()) {
clone.setLogin((Login)clone.getLogin().clone());
}
return clone;
} catch (CloneNotSupportedException e) {
return null;
}
}
/**
* PUBLIC:
* A lazy connection only acquires a physical connection
* when a transaction is started and releases the connection when the transaction completes.
*/
public void dontUseLazyConnection() {
setIsLazy(false);
}
/**
* PUBLIC:
* Return the login to use for this connection.
* Client sessions support using a seperate user login for database modification.
*/
public Login getLogin() {
return login;
}
/**
* PUBLIC:
* Return the pool name or null if not part of a pool.
*/
public String getPoolName() {
return poolName;
}
/**
* 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.
*/
public Map getProperties() {
if (this.properties == null) {
this.properties = new HashMap();
}
return this.properties;
}
/**
* PUBLIC:
* Returns the property associated with the corresponding key. These properties will be available to
* connection events.
*/
public Object getProperty(Object object) {
if (this.hasProperties()) {
return this.getProperties().get(object);
}
return null;
}
/**
* PUBLIC:
* Return if a login is used, only one of login and pool can be used.
*/
public boolean hasLogin() {
return login != null;
}
/**
* PUBLIC:
* Returns true if properties are available on the Connection Policy
*/
public boolean hasProperties() {
return (this.properties != null) && (!this.properties.isEmpty());
}
/**
* 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.
*/
public boolean isLazy() {
return isLazy;
}
/**
* INTERNAL:
* Return if part of a connection pool.
*/
public boolean isPooled() {
return poolName != null;
}
/**
* INTERNAL:
* Return if part of a connection pool.
*/
public boolean isUserDefinedConnection() {
return poolName == null;
}
/**
* 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.
*/
public Object removeProperty(Object key) {
if (this.hasProperties()) {
return getProperties().remove(key);
}
return null;
}
/**
* 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.
*/
public void setIsLazy(boolean isLazy) {
this.isLazy = isLazy;
}
/**
* PUBLIC:
* Set the login to use for this connection.
* Client sessions support using a seperate user login for database modification.
* Pooled connections must use the pool's login and cannot define their own.
*/
public void setLogin(Login login) {
this.login = login;
}
/**
* PUBLIC:
* Set the pool name or null if not part of a pool.
*/
public void setPoolName(String poolName) {
this.poolName = poolName;
}
/**
* 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.
*/
public void setProperty(Object key, Object property) {
getProperties().put(key, property);
}
/**
* INTERNAL:
* return a string representation of this ConnectionPolicy
*/
public String toString() {
String type = "";
if (isPooled()) {
type = "(" + ToStringLocalization.buildMessage("pooled", (Object[])null) + ": " + getPoolName();
} else {
type = "(" + ToStringLocalization.buildMessage("login", (Object[])null) + ": " + getLogin();
}
if (isLazy()) {
type = type + "," + ToStringLocalization.buildMessage("lazy", (Object[])null) + ")";
} else {
type = type + "," + ToStringLocalization.buildMessage("non-lazy", (Object[])null) + ")";
}
return Helper.getShortClassName(getClass()) + type;
}
/**
* PUBLIC:
* A lazy connection only acquires a physical connection
* when a transaction is started and releases the connection when the transaction completes.
*/
public void useLazyConnection() {
setIsLazy(true);
}
}
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