Provides MBean server references. There are no instances of this class.
Since JMX 1.2 this class makes it possible to replace the default MBeanServer implementation. This is done using the javax.management.MBeanServerBuilder class. The class of the initial MBeanServerBuilder to be instantiated can be specified through the javax.management.builder.initial system property. The specified class must be a public subclass of javax.management.MBeanServerBuilder , and must have a public empty constructor.
By default, if no value for that property is specified, an instance of javax.management.MBeanServerBuilder is created. Otherwise, the MBeanServerFactory attempts to load the specified class using Thread.currentThread().getContextClassLoader() , or if that is null, Class.forName() . Then it creates an initial instance of that Class using . If any checked exception is raised during this process (e.g. java.lang.ClassNotFoundException , java.lang.InstantiationException ) the MBeanServerFactory will propagate this exception from within a RuntimeException.
The javax.management.builder.initial system property is consulted every time a new MBeanServer needs to be created, and the class pointed to by that property is loaded. If that class is different from that of the current MBeanServerBuilder, then a new MBeanServerBuilder is created. Otherwise, the MBeanServerFactory may create a new MBeanServerBuilder or reuse the current one.
If the class pointed to by the property cannot be loaded, or does not correspond to a valid subclass of MBeanServerBuilder then an exception is propagated, and no MBeanServer can be created until the javax.management.builder.initial system property is reset to valid value.
The MBeanServerBuilder makes it possible to wrap the MBeanServers returned by the default MBeanServerBuilder implementation, for the purpose of e.g. adding an additional security layer.
Return a new object implementing the MBeanServer interface with a standard default domain name. The default domain name is used as the domain part in the ObjectName of MBeans when the domain is specified by the user is null.
The standard default domain name is
DefaultDomain.
The MBeanServer reference is internally kept. This will
allow findMBeanServer to return a reference to
this MBeanServer object.
This method is equivalent to createMBeanServer(null).
Return a new object implementing the MBeanServer interface with the specified default domain name. The given domain name is used as the domain part in the ObjectName of MBeans when the domain is specified by the user is null.
The MBeanServer reference is internally kept. This will
allow findMBeanServer to return a reference to
this MBeanServer object.
The equals method implements an equivalence relation
on non-null object references:
x, x.equals(x) should return
true.
x and y, x.equals(y)
should return true if and only if
y.equals(x) returns true.
x, y, and z, if
x.equals(y) returns true and
y.equals(z) returns true, then
x.equals(z) should return true.
x and y, multiple invocations of
x.equals(y) consistently return true
or consistently return false, provided no
information used in equals comparisons on the
objects is modified.
x,
x.equals(null) should return false.
The equals method for class Object implements
the most discriminating possible equivalence relation on objects;
that is, for any non-null reference values x and
y, this method returns true if and only
if x and y refer to the same object
(x == y has the value true).
Note that it is generally necessary to override the hashCode method whenever this method is overridden, so as to maintain the general contract for the hashCode method, which states that equal objects must have equal hash codes.
Return a list of registered MBeanServer objects. A
registered MBeanServer object is one that was created by one of
the createMBeanServer methods and not subsequently
released with releaseMBeanServer.
java.util.Hashtable.
The general contract of hashCode is:
hashCode method on each of
the two objects must produce the same integer result.
As much as is reasonably practical, the hashCode method defined by class Object does return distinct integers for distinct objects. (This is typically implemented by converting the internal address of the object into an integer, but this implementation technique is not required by the JavaTM programming language.)
Return a new object implementing the MBeanServer interface with a standard default domain name, without keeping an internal reference to this new object. The default domain name is used as the domain part in the ObjectName of MBeans when the domain is specified by the user is null.
The standard default domain name is
DefaultDomain.
No reference is kept. findMBeanServer will not
be able to return a reference to this MBeanServer object, but
the garbage collector will be able to remove the MBeanServer
object when it is no longer referenced.
This method is equivalent to newMBeanServer(null).
Return a new object implementing the MBeanServer interface with the specified default domain name, without keeping an internal reference to this new object. The given domain name is used as the domain part in the ObjectName of MBeans when the domain is specified by the user is null.
No reference is kept. findMBeanServer will not
be able to return a reference to this MBeanServer object, but
the garbage collector will be able to remove the MBeanServer
object when it is no longer referenced.
wait methods.
The awakened thread will not be able to proceed until the current thread relinquishes the lock on this object. The awakened thread will compete in the usual manner with any other threads that might be actively competing to synchronize on this object; for example, the awakened thread enjoys no reliable privilege or disadvantage in being the next thread to lock this object.
This method should only be called by a thread that is the owner of this object's monitor. A thread becomes the owner of the object's monitor in one of three ways:
synchronized statement
that synchronizes on the object.
Class, by executing a
synchronized static method of that class.
Only one thread at a time can own an object's monitor.
wait methods.
The awakened threads will not be able to proceed until the current thread relinquishes the lock on this object. The awakened threads will compete in the usual manner with any other threads that might be actively competing to synchronize on this object; for example, the awakened threads enjoy no reliable privilege or disadvantage in being the next thread to lock this object.
This method should only be called by a thread that is the owner
of this object's monitor. See the notify method for a
description of the ways in which a thread can become the owner of
a monitor.
toString method returns a string that
"textually represents" this object. The result should
be a concise but informative representation that is easy for a
person to read.
It is recommended that all subclasses override this method.
The toString method for class Object
returns a string consisting of the name of the class of which the
object is an instance, the at-sign character `@', and
the unsigned hexadecimal representation of the hash code of the
object. In other words, this method returns a string equal to the
value of:
getClass().getName() + '@' + Integer.toHexString(hashCode())
The current thread must own this object's monitor. The thread
releases ownership of this monitor and waits until another thread
notifies threads waiting on this object's monitor to wake up
either through a call to the notify method or the
notifyAll method. The thread then waits until it can
re-obtain ownership of the monitor and resumes execution.
As in the one argument version, interrupts and spurious wakeups are possible, and this method should always be used in a loop:
synchronized (obj) {
while (<condition does not hold>)
obj.wait();
... // Perform action appropriate to condition
}
This method should only be called by a thread that is the owner
of this object's monitor. See the notify method for a
description of the ways in which a thread can become the owner of
a monitor.The current thread must own this object's monitor.
This method causes the current thread (call it T) to place itself in the wait set for this object and then to relinquish any and all synchronization claims on this object. Thread T becomes disabled for thread scheduling purposes and lies dormant until one of four things happens:
A thread can also wake up without being notified, interrupted, or timing out, a so-called spurious wakeup. While this will rarely occur in practice, applications must guard against it by testing for the condition that should have caused the thread to be awakened, and continuing to wait if the condition is not satisfied. In other words, waits should always occur in loops, like this one:
synchronized (obj) {
while (<condition does not hold>)
obj.wait(timeout);
... // Perform action appropriate to condition
}
(For more information on this topic, see Section 3.2.3 in Doug Lea's
"Concurrent Programming in Java (Second Edition)" (Addison-Wesley,
2000), or Item 50 in Joshua Bloch's "Effective Java Programming
Language Guide" (Addison-Wesley, 2001).
If the current thread is interrupted by another thread while it is waiting, then an InterruptedException is thrown. This exception is not thrown until the lock status of this object has been restored as described above.
Note that the wait method, as it places the current thread into the wait set for this object, unlocks only this object; any other objects on which the current thread may be synchronized remain locked while the thread waits.
This method should only be called by a thread that is the owner
of this object's monitor. See the notify method for a
description of the ways in which a thread can become the owner of
a monitor.
This method is similar to the wait method of one
argument, but it allows finer control over the amount of time to
wait for a notification before giving up. The amount of real time,
measured in nanoseconds, is given by:
1000000*timeout+nanos
In all other respects, this method does the same thing as the method of one argument. In particular, wait(0, 0) means the same thing as wait(0).
The current thread must own this object's monitor. The thread releases ownership of this monitor and waits until either of the following two conditions has occurred:
notify method
or the notifyAll method.
timeout
milliseconds plus nanos nanoseconds arguments, has
elapsed.
The thread then waits until it can re-obtain ownership of the monitor and resumes execution.
As in the one argument version, interrupts and spurious wakeups are possible, and this method should always be used in a loop:
synchronized (obj) {
while (<condition does not hold>)
obj.wait(timeout, nanos);
... // Perform action appropriate to condition
}
This method should only be called by a thread that is the owner
of this object's monitor. See the notify method for a
description of the ways in which a thread can become the owner of
a monitor.