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java.lang.Object | +--com.ibm.mqe.MQeLoader
A base-class providing a way of plugging user-written class loaders into MQe.
MQe loads many classes dynamically using this MQeLoader class.
An MQeLoader object is statically constructed within the MQe class.
MQe configuration information often holds the name of a java class, which is loaded by name at run time.
To do so the loadClass and loadObject methods are used.
Any calls to those methods cause the loader which is currently set into the MQe
class, using the MQe.setLoader(com.ibm.mqe.MQeLoader)
method, to be invoked on its
loadClass or loadObject method.
The {com.ibm.mqe.MQe} class delegates all loading responsibilities to this class, or a subclass of this class.
This class can be treated as a base class, which can be subclassed by custom code.
The custom subclass can then be used by MQe after it has been passed to the
MQe.setLoader(com.ibm.mqe.MQeLoader)
method,
Responsibilities of this class are:
Constructor Summary | |
MQeLoader()
Constructor |
Method Summary | |
void |
addClass(java.lang.String className,
java.lang.Class theClass)
Adds a class to the loader |
java.lang.Class |
loadClass(java.lang.String className,
boolean reserved)
Loads and gets a reference to an instance of class Class representing the named class. |
java.lang.Object |
loadObject(java.lang.String className)
Gets a new instance of the named class. |
void |
removeClass(java.lang.String className)
Removes a class from the loader |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
public MQeLoader()
Method Detail |
public java.lang.Class loadClass(java.lang.String className, boolean reserved) throws java.lang.ClassNotFoundException
Classes loaded are cached so they don't have to be loaded in the future. Destroying and re-creating the loader will flush the cache.
This method should not be called directly from any code.
It should be called only by the MQe
class when the
loadClass method is called.
className
- A java.lang.String, holding either a valid class on the classpath, or
an alias for a valid class on the classpath. If it has .class at the end, this is stripped
off before the class name is used.reserved
- A boolean. Not used.Retained for backward compatability with
previous releases.
java.lang.ClassNotFoundException
public java.lang.Object loadObject(java.lang.String className) throws java.lang.Exception
The Class object containing the code for the class named is loaded using the
loadClass(java.lang.String, boolean)
method during this call.
The class specified must be loadable, and must have a default (no argument) constructor.
This method should not be called directly from any code.
It should be called only by the MQe
class when the
MQe.loadObject(java.lang.String)
method is called.
className
- java.lang.String. A java class name. The class name for which
a new instance is to be instantiated.It must be either a valid class on the classpath
or an alias for a valid class on the classpath,
java.lang.Exception
public void addClass(java.lang.String className, java.lang.Class theClass)
className
- java.lang.String. A java class name. The class name for which the
Class would be loaded.theClass
- java.lang.Class. The actual class that will be instantiated
public void removeClass(java.lang.String className)
className
- java.lang.String. A java class name. The class name for which the
Class would be loaded.
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