jdk.lang.management.ThreadInfo — clojure-interop/java.lang.management 1.0.5

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.

Synchronization Statistics

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 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.

*from clj

(*from cd)

Returns a ThreadInfo object represented by the given CompositeData. The given CompositeData must contain the following attributes unless otherwise specified below:

Attribute Name Type

threadId java.lang.Long

threadName java.lang.String

threadState java.lang.String

suspended java.lang.Boolean

inNative java.lang.Boolean

blockedCount java.lang.Long

blockedTime java.lang.Long

waitedCount java.lang.Long

waitedTime java.lang.Long

lockInfo javax.management.openmbean.CompositeData - the mapped type for LockInfo as specified in the LockInfo.from(javax.management.openmbean.CompositeData) method.

   If cd does not contain this attribute,
   the LockInfo object will be constructed from
   the value of the lockName attribute.

lockName java.lang.String

lockOwnerId java.lang.Long

lockOwnerName java.lang.String

stackTrace javax.management.openmbean.CompositeData[]

   Each element is a CompositeData representing
   StackTraceElement containing the following attributes:



     Attribute Name
     Type


     className
     java.lang.String


     methodName
     java.lang.String


     fileName
     java.lang.String


     lineNumber
     java.lang.Integer


     nativeMethod
     java.lang.Boolean

lockedMonitors javax.management.openmbean.CompositeData[] whose element type is the mapped type for MonitorInfo as specified in the Monitor.from method.

   If cd does not contain this attribute,
   this attribute will be set to an empty array.

lockedSynchronizers javax.management.openmbean.CompositeData[] whose element type is the mapped type for LockInfo as specified in the LockInfo.from(javax.management.openmbean.CompositeData) method.

   If cd does not contain this attribute,
   this attribute will be set to an empty array.

cd - CompositeData representing a ThreadInfo - javax.management.openmbean.CompositeData

returns: a ThreadInfo object represented by cd if cd is not null; null otherwise. - java.lang.management.ThreadInfo

throws: java.lang.IllegalArgumentException - if cd does not represent a ThreadInfo with the attributes described above.

get-blocked-count clj

(get-blocked-count this)

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. - long

get-blocked-time clj

(get-blocked-time this)

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. - long

throws: java.lang.UnsupportedOperationException - if the Java virtual machine does not support this operation.

get-lock-info clj

(get-lock-info this)

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. - java.lang.management.LockInfo

get-lock-name clj

(get-lock-name this)

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. - java.lang.String

get-lock-owner-id clj

(get-lock-owner-id this)

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 is not owned by any thread. - long

get-lock-owner-name clj

(get-lock-owner-name this)

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. - java.lang.String

get-locked-monitors clj

(get-locked-monitors this)

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. - java.lang.management.MonitorInfo[]

get-locked-synchronizers clj

(get-locked-synchronizers this)

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. - java.lang.management.LockInfo[]

get-stack-trace clj

(get-stack-trace this)

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. - java.lang.StackTraceElement[]

get-thread-id clj

(get-thread-id this)

Returns the ID of the thread associated with this ThreadInfo.

returns: the ID of the associated thread. - long

get-thread-name clj

(get-thread-name this)

Returns the name of the thread associated with this ThreadInfo.

returns: the name of the associated thread. - java.lang.String

get-thread-state clj

(get-thread-state this)

Returns the state of the thread associated with this ThreadInfo.

returns: Thread.State of the associated thread. - java.lang.Thread$State

get-waited-count clj

(get-waited-count this)

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. - long

get-waited-time clj

(get-waited-time this)

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. - long

throws: java.lang.UnsupportedOperationException - if the Java virtual machine does not support this operation.

in-native? clj

(in-native? this)

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. - boolean

suspended? clj

(suspended? this)

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. - boolean

to-string clj

(to-string this)

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.

returns: a string representation of this thread info. - java.lang.String