Package org.apache.tomcat.dbcp.pool2
Interface PooledObject<T>
- Type Parameters:
T- the type of object in the pool
- All Superinterfaces:
Comparable<PooledObject<T>>
- All Known Implementing Classes:
DefaultPooledObject,PooledSoftReference
Defines the wrapper that is used to track the additional information, such as
state, for the pooled objects.
Implementations of this class are required to be thread-safe.
- Since:
- 2.0
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Method Summary
Modifier and TypeMethodDescriptionbooleanallocate()Allocates the object.intcompareTo(PooledObject<T> other) Orders instances based on idle time - i.e. the length of time since the instance was returned to the pool.booleanbooleanendEvictionTest(Deque<PooledObject<T>> idleQueue) Called to inform the object that the eviction test has ended.booleanlongObtains the time in milliseconds that this object last spent in the active state (it may still be active in which case subsequent calls will return an increased value).longGets the number of times this object has been borrowed.longObtains the time (using the same basis asSystem.currentTimeMillis()) that this object was created.longObtains the time in milliseconds that this object last spend in the idle state (it may still be idle in which case subsequent calls will return an increased value).longObtains the time the wrapped object was last borrowed.longObtains the time the wrapped object was last returned.longReturns an estimate of the last time this object was used.Obtains the underlying object that is wrapped by this instance ofPooledObject.getState()Returns the state of this object.inthashCode()voidSets the state toINVALIDvoidMarks the pooled object as abandoned.voidMarks the object as returning to the pool.voidprintStackTrace(PrintWriter writer) Prints the stack trace of the code that borrowed this pooled object and the stack trace of the last code to use this object (if available) to the supplied writer.voidsetLogAbandoned(boolean logAbandoned) Is abandoned object tracking being used?voidsetRequireFullStackTrace(boolean requireFullStackTrace) Configures the stack trace generation strategy based on whether or not fully detailed stack traces are required.booleanAttempts to place the pooled object in thePooledObjectState.EVICTIONstate.toString()Provides a String form of the wrapper for debug purposes.voiduse()Record the current stack trace as the last time the object was used.
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Method Details
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getObject
T getObject()Obtains the underlying object that is wrapped by this instance ofPooledObject.- Returns:
- The wrapped object
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getCreateTime
long getCreateTime()Obtains the time (using the same basis asSystem.currentTimeMillis()) that this object was created.- Returns:
- The creation time for the wrapped object
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getActiveTimeMillis
long getActiveTimeMillis()Obtains the time in milliseconds that this object last spent in the active state (it may still be active in which case subsequent calls will return an increased value).- Returns:
- The time in milliseconds last spent in the active state
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getBorrowedCount
long getBorrowedCount()Gets the number of times this object has been borrowed.- Returns:
- The number of times this object has been borrowed.
- Since:
- 2.7.0
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getIdleTimeMillis
long getIdleTimeMillis()Obtains the time in milliseconds that this object last spend in the idle state (it may still be idle in which case subsequent calls will return an increased value).- Returns:
- The time in milliseconds last spent in the idle state
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getLastBorrowTime
long getLastBorrowTime()Obtains the time the wrapped object was last borrowed.- Returns:
- The time the object was last borrowed
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getLastReturnTime
long getLastReturnTime()Obtains the time the wrapped object was last returned.- Returns:
- The time the object was last returned
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getLastUsedTime
long getLastUsedTime()Returns an estimate of the last time this object was used. If the class of the pooled object implementsTrackedUse, what is returned is the maximum ofTrackedUse.getLastUsed()andgetLastBorrowTime(); otherwise this method gives the same value asgetLastBorrowTime().- Returns:
- the last time this object was used
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compareTo
Orders instances based on idle time - i.e. the length of time since the instance was returned to the pool. Used by the GKOP idle object evictor.Note: This class has a natural ordering that is inconsistent with equals if distinct objects have the same identity hash code.
- Specified by:
compareToin interfaceComparable<T>
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equals
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hashCode
int hashCode() -
toString
String toString()Provides a String form of the wrapper for debug purposes. The format is not fixed and may change at any time. -
startEvictionTest
boolean startEvictionTest()Attempts to place the pooled object in thePooledObjectState.EVICTIONstate.- Returns:
trueif the object was placed in thePooledObjectState.EVICTIONstate otherwisefalse
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endEvictionTest
Called to inform the object that the eviction test has ended.- Parameters:
idleQueue- The queue of idle objects to which the object should be returned- Returns:
- Currently not used
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allocate
boolean allocate()Allocates the object.- Returns:
trueif the original state wasIDLE
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deallocate
boolean deallocate()- Returns:
trueif the state wasALLOCATED
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invalidate
void invalidate()Sets the state toINVALID -
setLogAbandoned
void setLogAbandoned(boolean logAbandoned) Is abandoned object tracking being used? If this is true the implementation will need to record the stack trace of the last caller to borrow this object.- Parameters:
logAbandoned- The new configuration setting for abandoned object tracking
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setRequireFullStackTrace
void setRequireFullStackTrace(boolean requireFullStackTrace) Configures the stack trace generation strategy based on whether or not fully detailed stack traces are required. When set to false, abandoned logs may only include caller class information rather than method names, line numbers, and other normal metadata available in a full stack trace.- Parameters:
requireFullStackTrace- the new configuration setting for abandoned object logging- Since:
- 2.7.0
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use
void use()Record the current stack trace as the last time the object was used. -
printStackTrace
Prints the stack trace of the code that borrowed this pooled object and the stack trace of the last code to use this object (if available) to the supplied writer.- Parameters:
writer- The destination for the debug output
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getState
PooledObjectState getState()Returns the state of this object.- Returns:
- state
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markAbandoned
void markAbandoned()Marks the pooled object as abandoned. -
markReturning
void markReturning()Marks the object as returning to the pool.
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