Package org.apache.tomcat.dbcp.pool2
Interface PooledObject<T>
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- Type Parameters:
T- the type of object in the pool
- All Superinterfaces:
java.lang.Comparable<PooledObject<T>>
- All Known Implementing Classes:
DefaultPooledObject,PooledSoftReference
public interface PooledObject<T> extends java.lang.Comparable<PooledObject<T>>
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
All Methods Instance Methods Abstract Methods Default Methods Deprecated Methods Modifier and Type Method Description booleanallocate()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.booleandeallocate()booleanendEvictionTest(java.util.Deque<PooledObject<T>> idleQueue)Notifies the object that the eviction test has ended.booleanequals(java.lang.Object obj)default java.time.DurationgetActiveDuration()Gets the amount of time this object last spent in the active state (it may still be active in which case subsequent calls will return an increased value).default java.time.DurationgetActiveTime()Deprecated.UsegetActiveDuration().longgetActiveTimeMillis()Deprecated.UsegetActiveTime()which offers the best precision.default longgetBorrowedCount()Gets the number of times this object has been borrowed.default java.time.InstantgetCreateInstant()Gets the time (using the same basis asInstant.now()) that this object was created.longgetCreateTime()Deprecated.UsegetCreateInstant()which offers the best precision.default java.time.DurationgetFullDuration()Computes the duration since this object was created (usingInstant.now()).default java.time.DurationgetIdleDuration()Gets the amount of time that this object last spend in the idle state (it may still be idle in which case subsequent calls will return an increased value).default java.time.DurationgetIdleTime()Deprecated.UsegetIdleDuration().longgetIdleTimeMillis()Deprecated.UsegetIdleTime()which offers the best precision.default java.time.InstantgetLastBorrowInstant()Gets the time the wrapped object was last borrowed.longgetLastBorrowTime()Deprecated.UsegetLastBorrowInstant()which offers the best precision.default java.time.InstantgetLastReturnInstant()Gets the time the wrapped object was last borrowed.longgetLastReturnTime()Deprecated.UsegetLastReturnInstant()which offers the best precision.default java.time.InstantgetLastUsedInstant()Gets an estimate of the last time this object was used.longgetLastUsedTime()Deprecated.UsegetLastUsedInstant()which offers the best precision.TgetObject()Gets the underlying object that is wrapped by this instance ofPooledObject.PooledObjectStategetState()Gets the state of this object.inthashCode()voidinvalidate()Sets the state toINVALID.voidmarkAbandoned()Marks the pooled object as abandoned.voidmarkReturning()Marks the object as returning to the pool.voidprintStackTrace(java.io.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)Sets whether to use abandoned object tracking.default voidsetRequireFullStackTrace(boolean requireFullStackTrace)Sets the stack trace generation strategy based on whether or not fully detailed stack traces are required.booleanstartEvictionTest()Attempts to place the pooled object in thePooledObjectState.EVICTIONstate.java.lang.StringtoString()Gets a String form of the wrapper for debug purposes.voiduse()Records the current stack trace as the last time the object was used.
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Method Detail
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allocate
boolean allocate()
Allocates the object.- Returns:
trueif the original state wasIDLE
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compareTo
int compareTo(PooledObject<T> other)
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 interfacejava.lang.Comparable<T>
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deallocate
boolean deallocate()
- Returns:
trueif the state wasALLOCATED.
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endEvictionTest
boolean endEvictionTest(java.util.Deque<PooledObject<T>> idleQueue)
Notifies 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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equals
boolean equals(java.lang.Object obj)
- Overrides:
equalsin classjava.lang.Object
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getActiveDuration
default java.time.Duration getActiveDuration()
Gets the amount of time 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 duration last spent in the active state.
- Since:
- 2.11.0
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getActiveTime
@Deprecated default java.time.Duration getActiveTime()
Deprecated.UsegetActiveDuration().Gets the amount of time 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 duration last spent in the active state.
- Since:
- 2.10.0
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getActiveTimeMillis
@Deprecated long getActiveTimeMillis()
Deprecated.UsegetActiveTime()which offers the best precision.Gets the amount of time in milliseconds 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
default long getBorrowedCount()
Gets the number of times this object has been borrowed.- Returns:
- -1 by default for implementations prior to release 2.7.0.
- Since:
- 2.7.0
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getCreateInstant
default java.time.Instant getCreateInstant()
Gets the time (using the same basis asInstant.now()) that this object was created.- Returns:
- The creation time for the wrapped object.
- Since:
- 2.11.0
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getCreateTime
@Deprecated long getCreateTime()
Deprecated.UsegetCreateInstant()which offers the best precision.Gets 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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getFullDuration
default java.time.Duration getFullDuration()
Computes the duration since this object was created (usingInstant.now()).- Returns:
- The duration since this object was created.
- Since:
- 2.12.0
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getIdleDuration
default java.time.Duration getIdleDuration()
Gets the amount of time 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 amount of time in last spent in the idle state.
- Since:
- 2.11.0
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getIdleTime
@Deprecated default java.time.Duration getIdleTime()
Deprecated.UsegetIdleDuration().Gets the amount of time 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 amount of time in last spent in the idle state.
- Since:
- 2.10.0
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getIdleTimeMillis
@Deprecated long getIdleTimeMillis()
Deprecated.UsegetIdleTime()which offers the best precision.Gets the amount of 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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getLastBorrowInstant
default java.time.Instant getLastBorrowInstant()
Gets the time the wrapped object was last borrowed.- Returns:
- The time the object was last borrowed.
- Since:
- 2.11.0
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getLastBorrowTime
@Deprecated long getLastBorrowTime()
Deprecated.UsegetLastBorrowInstant()which offers the best precision.Gets the time the wrapped object was last borrowed.- Returns:
- The time the object was last borrowed.
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getLastReturnInstant
default java.time.Instant getLastReturnInstant()
Gets the time the wrapped object was last borrowed.- Returns:
- The time the object was last borrowed.
- Since:
- 2.11.0
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getLastReturnTime
@Deprecated long getLastReturnTime()
Deprecated.UsegetLastReturnInstant()which offers the best precision.Gets the time the wrapped object was last returned.- Returns:
- The time the object was last returned.
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getLastUsedInstant
default java.time.Instant getLastUsedInstant()
Gets 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.getLastUsedInstant()andgetLastBorrowTime(); otherwise this method gives the same value asgetLastBorrowTime().- Returns:
- the last time this object was used
- Since:
- 2.11.0
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getLastUsedTime
@Deprecated long getLastUsedTime()
Deprecated.UsegetLastUsedInstant()which offers the best precision.Gets 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.getLastUsedInstant()andgetLastBorrowTime(); otherwise this method gives the same value asgetLastBorrowTime().- Returns:
- the last time this object was used.
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getObject
T getObject()
Gets the underlying object that is wrapped by this instance ofPooledObject.- Returns:
- The wrapped object.
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getState
PooledObjectState getState()
Gets the state of this object.- Returns:
- state
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hashCode
int hashCode()
- Overrides:
hashCodein classjava.lang.Object
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invalidate
void invalidate()
Sets the state toINVALID.
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markAbandoned
void markAbandoned()
Marks the pooled object as abandoned.
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markReturning
void markReturning()
Marks the object as returning to the pool.
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printStackTrace
void printStackTrace(java.io.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.- Parameters:
writer- The destination for the debug output.
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setLogAbandoned
void setLogAbandoned(boolean logAbandoned)
Sets whether to use abandoned object tracking. 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
default void setRequireFullStackTrace(boolean requireFullStackTrace)
Sets 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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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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toString
java.lang.String toString()
Gets a String form of the wrapper for debug purposes. The format is not fixed and may change at any time.- Overrides:
toStringin classjava.lang.Object
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use
void use()
Records the current stack trace as the last time the object was used.
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