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ConditionPriorityBlockingQueue

public class ConditionPriorityBlockingQueue
extends Object

java.lang.Object
↳	com.android.tradefed.util.ConditionPriorityBlockingQueue<T>

A thread-safe class with ERROR(/PriorityBlockingQueue)-like operations that can retrieve objects that match a certain condition.

Iteration is also thread-safe, but not consistent. A copy of the queue is made at iterator creation time, and that copy is used as the iteration target. If queue is modified during iteration, a ERROR(/ConcurrentModificationException) will not be thrown, but the iterator will also not reflect the modified contents.

See also:

ERROR(/PriorityBlockingQueue)

Summary

Nested classes
`class`	`ConditionPriorityBlockingQueue.AlwaysMatch<T>` A `ConditionPriorityBlockingQueue.IMatcher` that matches any object.
`interface`	`ConditionPriorityBlockingQueue.IMatcher<T>` An interface for determining if elements match some sort of condition.

Public constructors
`ConditionPriorityBlockingQueue()` Creates a `ConditionPriorityBlockingQueue` Elements will be prioritized in FIFO order.
`ConditionPriorityBlockingQueue( c)` Creates a `ConditionPriorityBlockingQueue`

Public constructors


      ConditionPriorityBlockingQueue()

Creates a ConditionPriorityBlockingQueue

Elements will be prioritized in FIFO order.


      ConditionPriorityBlockingQueue( c)

Creates a ConditionPriorityBlockingQueue

Public methods
`boolean`	`add(T addedElement)` Inserts the specified element into this queue.
`T`	`addUnique(IMatcher<T> matcher, T object)` Adds a item to this queue, replacing any existing object that matches given condition
`void`	`clear()` Removes all elements from this queue.
`boolean`	`contains(T object)` Determine if an object is currently contained in this queue.
	`getCopy()` Get a copy of the contents of the queue.
	`iterator()`
`T`	`poll(long timeout, TimeUnit unit)` Retrieves and removes the minimum (as judged by the provided `ERROR(/Comparator)` element T in the queue.
`T`	`poll(long timeout, TimeUnit unit, IMatcher<T> matcher)` Retrieves and removes the minimum (as judged by the provided `ERROR(/Comparator)` element T in the queue where `matcher.matches(T)` is `true`.
`T`	`poll(IMatcher<T> matcher)` Retrieves and removes the minimum (as judged by the provided `ERROR(/Comparator)` element T in the queue where `matcher.matches(T)` is `true`.
`T`	`poll()` Retrieves and removes the head of this queue.
`boolean`	`remove(T object)` Removes an item from this queue.
`int`	`size()`
`T`	`take()` Retrieves and removes the minimum (as judged by the provided `ERROR(/Comparator)` element T in the queue.
`T`	`take(IMatcher<T> matcher)` Retrieves and removes the first element T in the queue where `matcher.matches(T)` is `true`, waiting if necessary until such an element becomes available.

Public constructors

ConditionPriorityBlockingQueue

public ConditionPriorityBlockingQueue ()

Creates a ConditionPriorityBlockingQueue

Elements will be prioritized in FIFO order.

ConditionPriorityBlockingQueue

public ConditionPriorityBlockingQueue ( c)

Creates a ConditionPriorityBlockingQueue

Parameters
`c`	: the `ERROR(/Comparator)` used to prioritize the queue.

Public methods

add

public boolean add (T addedElement)

Inserts the specified element into this queue. As the queue is unbounded this method will never block.

Parameters
`addedElement`	`T`: the element to add

Returns
`boolean`	`true`

Throws
`ClassCastException`	if the specified element cannot be compared with elements currently in the priority queue according to the priority queue's ordering
`NullPointerException`	if the specified element is null

addUnique

public T addUnique (IMatcher<T> matcher, 
                T object)

Adds a item to this queue, replacing any existing object that matches given condition

Parameters
`matcher`	`IMatcher`: the matcher to evaluate existing objects
`object`	`T`: the object to add

Returns
`T`	the replaced object or `null` if none exist

clear

public void clear ()

Removes all elements from this queue.

contains

public boolean contains (T object)

Determine if an object is currently contained in this queue.

Parameters
`object`	`T`: the object to find

Returns
`boolean`	`true` if given object is contained in queue. `false>` otherwise.

getCopy

public  getCopy ()

Get a copy of the contents of the queue.

Returns

iterator

public  iterator ()

Returns

poll

public T poll (long timeout, 
                TimeUnit unit)

Retrieves and removes the minimum (as judged by the provided ERROR(/Comparator) element T in the queue.

Blocks up to timeout time for an element to become available.

Parameters
`timeout`	`long`: the amount of time to wait for an element to become available
`unit`	`TimeUnit`: the `ERROR(/TimeUnit)` of timeout

Returns
`T`	the minimum matched element or `null` if there are no matching elements

poll

public T poll (long timeout, 
                TimeUnit unit, 
                IMatcher<T> matcher)

Retrieves and removes the minimum (as judged by the provided ERROR(/Comparator) element T in the queue where matcher.matches(T) is true.

Blocks up to timeout time for an element to become available.

Parameters
`timeout`	`long`: the amount of time to wait for an element to become available
`unit`	`TimeUnit`: the `ERROR(/TimeUnit)` of timeout
`matcher`	`IMatcher`: the `IMatcher` to use to evaluate elements

Returns
`T`	the minimum matched element or `null` if there are no matching elements

poll

public T poll (IMatcher<T> matcher)

Retrieves and removes the minimum (as judged by the provided ERROR(/Comparator) element T in the queue where matcher.matches(T) is true.

Parameters
`matcher`	`IMatcher`: the `IMatcher` to use to evaluate elements

Returns
`T`	the minimum matched element or `null` if there are no matching elements

poll

public T poll ()

Retrieves and removes the head of this queue.

Returns
`T`	the head of this queue, or `null` if the queue is empty

remove

public boolean remove (T object)

Removes an item from this queue.

Parameters
`object`	`T`: the object to remove

Returns
`boolean`	`true` if given object was removed from queue. `false>` otherwise.

size

public int size ()

Returns
`int`	the number of elements in queue

take

public T take ()

Retrieves and removes the minimum (as judged by the provided ERROR(/Comparator) element T in the queue.

Blocks indefinitely for an element to become available.

Returns
`T`	the head of this queue

Throws
`InterruptedException`	if interrupted while waiting

take

public T take (IMatcher<T> matcher)

Retrieves and removes the first element T in the queue where matcher.matches(T) is true, waiting if necessary until such an element becomes available.

Parameters
`matcher`	`IMatcher`: the `IMatcher` to use to evaluate elements

Returns
`T`	the matched element

Throws
`InterruptedException`	if interrupted while waiting

ConditionPriorityBlockingQueue

Summary

Nested classes

Public constructors

Public methods

Public constructors

ConditionPriorityBlockingQueue

ConditionPriorityBlockingQueue

Public methods

add

addUnique

clear

contains

getCopy

iterator

poll

poll

poll

poll

remove

size

take

take