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/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* Copyright (c) 2008, Red Hat Middleware LLC or third-party contributors as
* indicated by the @author tags or express copyright attribution
* statements applied by the authors. All third-party contributions are
* distributed under license by Red Hat Middleware LLC.
*
* This copyrighted material is made available to anyone wishing to use, modify,
* copy, or redistribute it subject to the terms and conditions of the GNU
* Lesser General Public License, as published by the Free Software Foundation.
*
* 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 Lesser General Public License
* for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this distribution; if not, write to:
* Free Software Foundation, Inc.
* 51 Franklin Street, Fifth Floor
* Boston, MA 02110-1301 USA
*
*/
package org.hibernate;
import java.io.Serializable;
import java.util.HashMap;
import java.util.Map;
/**
* Represents a flushing strategy. The flush process synchronizes
* database state with session state by detecting state changes
* and executing SQL statements.
*
* @see Session#setFlushMode(FlushMode)
* @see Query#setFlushMode(FlushMode)
* @see Criteria#setFlushMode(FlushMode)
*
* @author Gavin King
*/
public final class FlushMode
implements Serializable {
private static final Map INSTANCES =
new HashMap();
private final int level
;
private final String name
;
private FlushMode
(int level,
String name
) {
this.
level = level
;
this.
name = name
;
}
public String toString
() {
return name
;
}
/**
* The {@link Session} is never flushed unless {@link Session#flush}
* is explicitly called by the application. This mode is very
* efficient for read only transactions.
*
* @deprecated use {@link #MANUAL} instead.
*/
public static final FlushMode NEVER =
new FlushMode
( 0,
"NEVER" );
/**
* The {@link Session} is only ever flushed when {@link Session#flush}
* is explicitly called by the application. This mode is very
* efficient for read only transactions.
*/
public static final FlushMode MANUAL =
new FlushMode
( 0,
"MANUAL" );
/**
* The {@link Session} is flushed when {@link Transaction#commit}
* is called.
*/
public static final FlushMode COMMIT =
new FlushMode
(5,
"COMMIT");
/**
* The {@link Session} is sometimes flushed before query execution
* in order to ensure that queries never return stale state. This
* is the default flush mode.
*/
public static final FlushMode AUTO =
new FlushMode
(10,
"AUTO");
/**
* The {@link Session} is flushed before every query. This is
* almost always unnecessary and inefficient.
*/
public static final FlushMode ALWAYS =
new FlushMode
(20,
"ALWAYS");
public boolean lessThan
(FlushMode other
) {
return this.
level<other.
level;
}
static {
INSTANCES.
put( NEVER.
name, NEVER
);
INSTANCES.
put( MANUAL.
name, MANUAL
);
INSTANCES.
put( AUTO.
name, AUTO
);
INSTANCES.
put( ALWAYS.
name, ALWAYS
);
INSTANCES.
put( COMMIT.
name, COMMIT
);
}
public static boolean isManualFlushMode
(FlushMode mode
) {
return MANUAL.
level == mode.
level;
}
private Object readResolve
() {
return INSTANCES.
get( name
);
}
public static FlushMode parse
(String name
) {
return ( FlushMode
) INSTANCES.
get( name
);
}
}