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java.lang.management
Class ThreadInfo
java.lang.Object
java.lang.management.ThreadInfo
-
public class ThreadInfo
- extends Object
Thread information.
ThreadInfo
contains the information about a thread including:
General thread information
-
Thread ID.
-
Name of the thread.
Execution information
-
Thread state.
-
The object upon which the thread is blocked due to:
-
waiting to enter a synchronization block/method, or
-
waiting to be notified in a
Object.wait
method, or
-
parking due to a
LockSupport.park
call.
-
The ID of the thread that owns the object that the thread is blocked.
-
Stack trace of the thread.
-
List of object monitors locked by the thread.
-
List of
ownable synchronizers
locked by the thread.
Stack trace of the thread.
-
The number of times that the thread has blocked for synchronization or waited for notification.
-
The accumulated elapsed time that the thread has blocked for synchronization or waited for notification since
thread contention monitoring
thread contention monitoring
was enabled. Some Java virtual machine implementation may not support this. The
ThreadMXBean.isThreadContentionMonitoringSupported()
method can be used to determine if a Java virtual machine supports this.
This thread information class is designed for use in monitoring of the system, not for synchronization control.
MXBean Mapping
ThreadInfo
is mapped to a
CompositeData
with attributes as specified in the
from
method.
-
Since:
-
1.5
-
See Also:
-
ThreadMXBean.getThreadInfo(long)
ThreadMXBean.isThreadContentionMonitoringSupported()
,
ThreadMXBean.dumpAllThreads(boolean, boolean)
Method Summary
|
static
ThreadInfo
|
from
(
CompositeData
cd)
Returns a
ThreadInfo
object represented by the given
CompositeData
. |
long |
getBlockedCount
()
Returns the total number of times that the thread associated with this
ThreadInfo
blocked to enter or reenter a monitor. |
long |
getBlockedTime
()
Returns the approximate accumulated elapsed time (in milliseconds) that the thread associated with this
ThreadInfo
has blocked to enter or reenter a monitor since thread contention monitoring is enabled. |
MonitorInfo
|
getLockedMonitors
()
Returns an array of
MonitorInfo
ThreadInfo
.
|
LockInfo
|
getLockedSynchronizers
()
Returns an array of
LockInfo
objects, each of which represents an
ownable synchronizer
ThreadInfo
.
|
LockInfo
|
getLockInfo
()
Returns the
LockInfo
of an object for which the thread associated with this
ThreadInfo
is blocked waiting. |
String
|
getLockName
()
Returns the
string representation
of an object for which the thread associated with this
ThreadInfo
is blocked waiting. |
long |
getLockOwnerId
()
Returns the ID of the thread which owns the object for which the thread associated with this
ThreadInfo
is blocked waiting. |
String
|
getLockOwnerName
()
Returns the name of the thread which owns the object for which the thread associated with this
ThreadInfo
is blocked waiting. |
StackTraceElement
[] |
getStackTrace
()
Returns the stack trace of the thread associated with this
ThreadInfo
. |
long |
getThreadId
()
Returns the ID of the thread associated with this
ThreadInfo
. |
String
|
getThreadName
()
Returns the name of the thread associated with this
ThreadInfo
. |
Thread.State
|
getThreadState
()
Returns the state of the thread associated with this
ThreadInfo
. |
long |
getWaitedCount
()
Returns the total number of times that the thread associated with this
ThreadInfo
waited for notification. |
long |
getWaitedTime
()
Returns the approximate accumulated elapsed time (in milliseconds) that the thread associated with this
ThreadInfo
has waited for notification since thread contention monitoring is enabled. |
boolean |
isInNative
()
Tests if the thread associated with this
ThreadInfo
is executing native code via the Java Native Interface (JNI). |
boolean |
isSuspended
()
Tests if the thread associated with this
ThreadInfo
is suspended. |
String
|
toString
()
Returns a string representation of this thread info. |
getThreadId
public long getThreadId()
-
Returns the ID of the thread associated with this
ThreadInfo
.
-
-
Returns:
-
the ID of the associated thread.
getThreadName
public String getThreadName()
-
Returns the name of the thread associated with this
ThreadInfo
.
-
-
Returns:
-
the name of the associated thread.
getThreadState
public Thread.State getThreadState()
-
Returns the state of the thread associated with this
ThreadInfo
.
-
-
Returns:
-
Thread.State
of the associated thread.
getBlockedTime
public long getBlockedTime()
-
Returns the approximate accumulated elapsed time (in milliseconds) that the thread associated with this
ThreadInfo
has blocked to enter or reenter a monitor since thread contention monitoring is enabled. I.e. the total accumulated time the thread has been in the
BLOCKED
state since thread contention monitoring was last enabled. This method returns
-1
if thread contention monitoring is disabled.
The Java virtual machine may measure the time with a high resolution timer. This statistic is reset when the thread contention monitoring is reenabled.
-
-
Returns:
-
the approximate accumulated elapsed time in milliseconds that a thread entered the
BLOCKED
state;
-1
if thread contention monitoring is disabled.
-
Throws:
-
UnsupportedOperationException
- if the Java virtual machine does not support this operation.
-
See Also:
-
ThreadMXBean.isThreadContentionMonitoringSupported()
,
ThreadMXBean.setThreadContentionMonitoringEnabled(boolean)
getBlockedCount
public long getBlockedCount()
-
Returns the total number of times that the thread associated with this
ThreadInfo
blocked to enter or reenter a monitor. I.e. the number of times a thread has been in the
BLOCKED
state.
-
-
Returns:
-
the total number of times that the thread entered the
BLOCKED
state.
getWaitedTime
public long getWaitedTime()
-
Returns the approximate accumulated elapsed time (in milliseconds) that the thread associated with this
ThreadInfo
has waited for notification since thread contention monitoring is enabled. I.e. the total accumulated time the thread has been in the
WAITING
or
TIMED_WAITING
state since thread contention monitoring is enabled. This method returns
-1
if thread contention monitoring is disabled.
The Java virtual machine may measure the time with a high resolution timer. This statistic is reset when the thread contention monitoring is reenabled.
-
-
Returns:
-
the approximate accumulated elapsed time in milliseconds that a thread has been in the
WAITING
or
TIMED_WAITING
state;
-1
if thread contention monitoring is disabled.
-
Throws:
-
UnsupportedOperationException
- if the Java virtual machine does not support this operation.
-
See Also:
-
ThreadMXBean.isThreadContentionMonitoringSupported()
,
ThreadMXBean.setThreadContentionMonitoringEnabled(boolean)
getWaitedCount
public long getWaitedCount()
-
Returns the total number of times that the thread associated with this
ThreadInfo
waited for notification. I.e. the number of times that a thread has been in the
WAITING
or
TIMED_WAITING
state.
-
-
Returns:
-
the total number of times that the thread was in the
WAITING
or
TIMED_WAITING
state.
getLockInfo
public LockInfo getLockInfo()
-
Returns the
LockInfo
of an object for which the thread associated with this
ThreadInfo
is blocked waiting. A thread can be blocked waiting for one of the following:
-
an object monitor to be acquired for entering or reentering a synchronization block/method.
The thread is in the
BLOCKED
state waiting to enter the
synchronized
statement or method.
-
an object monitor to be notified by another thread.
The thread is in the
WAITING
or
TIMED_WAITING
state due to a call to the
Object.wait
method.
-
a synchronization object responsible for the thread parking.
The thread is in the
WAITING
or
TIMED_WAITING
state due to a call to the
LockSupport.park
method. The synchronization object is the object returned from
LockSupport.getBlocker
method. Typically it is an
ownable synchronizer
or a
Condition
.
This method returns
null
if the thread is not in any of the above conditions.
-
-
Returns:
-
LockInfo
of an object for which the thread is blocked waiting if any;
null
otherwise.
-
Since:
-
1.6
getLockName
public String getLockName()
-
Returns the
string representation
of an object for which the thread associated with this
ThreadInfo
is blocked waiting. This method is equivalent to calling:
getLockInfo().toString()
This method will return
null
if this thread is not blocked waiting for any object or if the object is not owned by any thread.
-
-
Returns:
-
the string representation of the object on which the thread is blocked if any;
null
otherwise.
-
See Also:
-
getLockInfo()
getLockOwnerId
public long getLockOwnerId()
-
Returns the ID of the thread which owns the object for which the thread associated with this
ThreadInfo
is blocked waiting. This method will return
-1
if this thread is not blocked waiting for any object or if the object is not owned by any thread.
-
-
Returns:
-
the thread ID of the owner thread of the object this thread is blocked on;
-1
if this thread is not blocked or if the object lis not owned by any thread.
-
See Also:
-
getLockInfo()
getLockOwnerName
public String getLockOwnerName()
-
Returns the name of the thread which owns the object for which the thread associated with this
ThreadInfo
is blocked waiting. This method will return
null
if this thread is not blocked waiting for any object or if the object is not owned by any thread.
-
-
Returns:
-
the name of the thread that owns the object this thread is blocked on;
null
if this thread is not blocked or if the object is not owned by any thread.
-
See Also:
-
getLockInfo()
getStackTrace
public StackTraceElement[] getStackTrace()
-
Returns the stack trace of the thread associated with this
ThreadInfo
. If no stack trace was requested for this thread info, this method will return a zero-length array. If the returned array is of non-zero length then the first element of the array represents the top of the stack, which is the most recent method invocation in the sequence. The last element of the array represents the bottom of the stack, which is the least recent method invocation in the sequence.
Some Java virtual machines may, under some circumstances, omit one or more stack frames from the stack trace. In the extreme case, a virtual machine that has no stack trace information concerning the thread associated with this
ThreadInfo
is permitted to return a zero-length array from this method.
-
-
Returns:
-
an array of
StackTraceElement
objects of the thread.
isSuspended
public boolean isSuspended()
-
Tests if the thread associated with this
ThreadInfo
is suspended. This method returns
true
if
Thread.suspend()
has been called.
-
-
Returns:
-
true
if the thread is suspended;
false
otherwise.
isInNative
public boolean isInNative()
-
Tests if the thread associated with this
ThreadInfo
is executing native code via the Java Native Interface (JNI). The JNI native code does not include the virtual machine support code or the compiled native code generated by the virtual machine.
-
-
Returns:
-
true
if the thread is executing native code;
false
otherwise.
toString
public String toString()
-
Returns a string representation of this thread info.
The format of this string depends on the implementation. The returned string will typically include the
thread name
, the
thread ID
, its
state
, and a
stack trace
if any.
-
-
Overrides:
-
toString
in class
Object
-
-
Returns:
-
a string representation of this thread info.
from
public static ThreadInfo from(CompositeData cd)
-
Returns a
ThreadInfo
object represented by the given
CompositeData
. The given
CompositeData
must contain the following attributes unless otherwise specified below:
-
-
Parameters:
-
cd -
CompositeData
representing a
ThreadInfo
-
Returns:
-
a
ThreadInfo
object represented by
cd
if
cd
is not
null
;
null
otherwise.
-
Throws:
-
IllegalArgumentException
- if
cd
does not represent a
ThreadInfo
with the attributes described above.
getLockedMonitors
public
MonitorInfo
[]
getLockedMonitors
()
-
Returns an array of
MonitorInfo
objects, each of which represents an object monitor currently locked by the thread associated with this
ThreadInfo
. If no locked monitor was requested for this thread info or no monitor is locked by the thread, this method will return a zero-length array.
-
-
Returns:
-
an array of
MonitorInfo
objects representing the object monitors locked by the thread.
-
Since:
-
1.6
getLockedSynchronizers
public
LockInfo
[]
getLockedSynchronizers
()
-
Returns an array of
LockInfo
objects, each of which represents an
ownable synchronizer
currently locked by the thread associated with this
ThreadInfo
. If no locked synchronizer was requested for this thread info or no synchronizer is locked by the thread, this method will return a zero-length array.
-
-
Returns:
-
an array of
LockInfo
objects representing the ownable synchronizers locked by the thread.
-
Since:
-
1.6