Java: Db4o.configure().activationDepth(activationDepth)
configures global activation depth, which will be used for all objects instead of the default value. This method should be called before opening a database file.
Java:ExtObjectContainer.configure().activationDepth(activationDepth)
has a similar effect, but the setting will be applied to the specific ObjectContainer and can be changed for the open database file.
01public static void testActivationConfig(){ 02
storeSensorPanel(); 03
ObjectContainer db = Db4o.openFile(Util.YAPFILENAME); 04
try { 05
db.ext().configure().activationDepth(1); 06
System.out.println("Object container activation depth = 1"); 07
ObjectSet result = db.get(new SensorPanel(1)); 08
listResult(result); 09
if (result.size() >0) { 10
SensorPanel sensor = (SensorPanel)result.get(0); 11
SensorPanel next = sensor.next; 12
while (next != null){ 13
System.out.println(next); 14
next = next.next; 15
} 16
} 17
} finally { 18
db.close(); 19
} 20
}
By configuring db4o you can have full control over activation behavior. The two extremes: