//$Id: FlushMode.java 10468 2006-09-08 12:23:08Z [email protected] $
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 );
}
}
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