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FlexDoc/Javadoc 2.0 Demo Java Doc |
Class LinkedBlockingDeque<E>
java.util.concurrent.LinkedBlockingDeque<E>
Type Parameters:
E - the type of elements held in this deque
All Implemented Interfaces:
public class LinkedBlockingDeque<E>
Since:
1.6
Author:
Doug Lea
See Also:
Constructor Summary |
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Creates a LinkedBlockingDeque with a capacity of
Integer.MAX_VALUE, initially containing the elements of
the given collection, added in traversal order of the
collection's iterator.
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Creates a LinkedBlockingDeque with the given (fixed) capacity.
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Method Summary |
boolean |
Inserts the specified element at the end of this deque unless it would
violate capacity restrictions.
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boolean |
Appends all of the elements in the specified collection to the end of
this deque, in the order that they are returned by the specified
collection's iterator.
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void |
Inserts the specified element at the front of this deque if it is
possible to do so immediately without violating capacity restrictions,
throwing an IllegalStateException if no space is currently
available.
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void |
Inserts the specified element at the end of this deque if it is
possible to do so immediately without violating capacity restrictions,
throwing an IllegalStateException if no space is currently
available.
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void |
Atomically removes all of the elements from this deque.
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boolean |
Returns true if this deque contains the specified element.
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Returns an iterator over the elements in this deque in reverse
sequential order.
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int |
Removes all available elements from this queue and adds them
to the given collection.
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int |
Removes at most the given number of available elements from
this queue and adds them to the given collection.
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Retrieves, but does not remove, the head of the queue represented by
this deque.
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void |
Performs the given action for each element of the Iterable
until all elements have been processed or the action throws an
exception.
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Retrieves, but does not remove, the first element of this deque.
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Retrieves, but does not remove, the last element of this deque.
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Returns an iterator over the elements in this deque in proper sequence.
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boolean |
Inserts the specified element into this queue if it is possible to do
so immediately without violating capacity restrictions.
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boolean |
Inserts the specified element into the queue represented by this deque
(in other words, at the tail of this deque), waiting up to the
specified wait time if necessary for space to become available.
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boolean |
Inserts the specified element at the front of this deque if it is
possible to do so immediately without violating capacity restrictions,
returning true upon success and false if no space is
currently available.
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boolean |
Inserts the specified element at the front of this deque,
waiting up to the specified wait time if necessary for space to
become available.
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boolean |
Inserts the specified element at the end of this deque if it is
possible to do so immediately without violating capacity restrictions,
returning true upon success and false if no space is
currently available.
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boolean |
Inserts the specified element at the end of this deque,
waiting up to the specified wait time if necessary for space to
become available.
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Retrieves, but does not remove, the head of this queue,
or returns null if this queue is empty.
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Retrieves, but does not remove, the first element of this deque,
or returns null if this deque is empty.
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Retrieves, but does not remove, the last element of this deque,
or returns null if this deque is empty.
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Retrieves and removes the head of this queue,
or returns null if this queue is empty.
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Retrieves and removes the head of the queue represented by this deque
(in other words, the first element of this deque), waiting up to the
specified wait time if necessary for an element to become available.
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Retrieves and removes the first element of this deque,
or returns null if this deque is empty.
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Retrieves and removes the first element of this deque, waiting
up to the specified wait time if necessary for an element to
become available.
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Retrieves and removes the last element of this deque,
or returns null if this deque is empty.
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Retrieves and removes the last element of this deque, waiting
up to the specified wait time if necessary for an element to
become available.
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Pops an element from the stack represented by this deque.
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void |
Pushes an element onto the stack represented by this deque (in other
words, at the head of this deque) if it is possible to do so
immediately without violating capacity restrictions, throwing an
IllegalStateException if no space is currently available.
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void |
Inserts the specified element into the queue represented by this deque
(in other words, at the tail of this deque), waiting if necessary for
space to become available.
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void |
Inserts the specified element at the front of this deque,
waiting if necessary for space to become available.
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void |
Inserts the specified element at the end of this deque,
waiting if necessary for space to become available.
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int |
Returns the number of additional elements that this deque can ideally
(in the absence of memory or resource constraints) accept without
blocking.
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Retrieves and removes the head of the queue represented by this deque.
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boolean |
Removes the first occurrence of the specified element from this deque.
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boolean |
Removes all of this collection's elements that are also contained in the
specified collection (optional operation).
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Retrieves and removes the first element of this deque.
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boolean |
Removes the first occurrence of the specified element from this deque.
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boolean |
Removes all of the elements of this collection that satisfy the given
predicate.
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Retrieves and removes the last element of this deque.
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boolean |
Removes the last occurrence of the specified element from this deque.
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boolean |
Retains only the elements in this collection that are contained in the
specified collection (optional operation).
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int |
Returns the number of elements in this deque.
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Retrieves and removes the head of the queue represented by this deque
(in other words, the first element of this deque), waiting if
necessary until an element becomes available.
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Retrieves and removes the first element of this deque, waiting
if necessary until an element becomes available.
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Retrieves and removes the last element of this deque, waiting
if necessary until an element becomes available.
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Returns an array containing all of the elements in this deque, in
proper sequence (from first to last element).
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Returns an array containing all of the elements in this deque, in
proper sequence; the runtime type of the returned array is that of
the specified array.
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Returns a string representation of this collection.
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Methods inherited from class java.lang. Object |
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Methods inherited from interface java.util. Collection |
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public LinkedBlockingDeque |
() |
public LinkedBlockingDeque |
(int capacity) |
Creates a
LinkedBlockingDeque with the given (fixed) capacity.
Parameters:
capacity - the capacity of this deque
Throws:
public LinkedBlockingDeque |
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Creates a
LinkedBlockingDeque with a capacity of
Integer.MAX_VALUE, initially containing the elements of
the given collection, added in traversal order of the
collection's iterator.
Parameters:
c - the collection of elements to initially contain
Throws:
Inserts the specified element at the front of this deque if it is
possible to do so immediately without violating capacity restrictions,
throwing an
IllegalStateException if no space is currently
available. When using a capacity-restricted deque, it is generally
preferable to use
offerFirst.
Specified by:
Parameters:
e - the element to add
Throws:
Inserts the specified element at the end of this deque if it is
possible to do so immediately without violating capacity restrictions,
throwing an
IllegalStateException if no space is currently
available. When using a capacity-restricted deque, it is generally
preferable to use
offerLast.
Specified by:
Parameters:
e - the element to add
Throws:
public boolean offerFirst |
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Inserts the specified element at the front of this deque if it is
possible to do so immediately without violating capacity restrictions,
returning
true upon success and
false if no space is
currently available.
When using a capacity-restricted deque, this method is generally
preferable to the
addFirst method, which can
fail to insert an element only by throwing an exception.
Specified by:
Parameters:
e - the element to add
Returns:
true if the element was added to this deque, else
false
Throws:
Inserts the specified element at the end of this deque if it is
possible to do so immediately without violating capacity restrictions,
returning
true upon success and
false if no space is
currently available.
When using a capacity-restricted deque, this method is generally
preferable to the
addLast method, which can
fail to insert an element only by throwing an exception.
Specified by:
Parameters:
e - the element to add
Returns:
true if the element was added to this deque, else
false
Throws:
public void putFirst |
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throws |
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Inserts the specified element at the front of this deque,
waiting if necessary for space to become available.
Specified by:
Parameters:
e - the element to add
Throws:
public void putLast |
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throws |
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Inserts the specified element at the end of this deque,
waiting if necessary for space to become available.
Specified by:
Parameters:
e - the element to add
Throws:
public boolean offerFirst |
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throws |
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Inserts the specified element at the front of this deque,
waiting up to the specified wait time if necessary for space to
become available.
Specified by:
Parameters:
e - the element to add
timeout - how long to wait before giving up, in units of
unit
unit - a TimeUnit determining how to interpret the
timeout parameter
Returns:
true if successful, or false if
the specified waiting time elapses before space is available
Throws:
public boolean offerLast |
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throws |
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Inserts the specified element at the end of this deque,
waiting up to the specified wait time if necessary for space to
become available.
Specified by:
Parameters:
e - the element to add
timeout - how long to wait before giving up, in units of
unit
unit - a TimeUnit determining how to interpret the
timeout parameter
Returns:
true if successful, or false if
the specified waiting time elapses before space is available
Throws:
Description copied from interface:
Deque
Retrieves and removes the first element of this deque. This method
differs from
pollFirst only in that it throws an
exception if this deque is empty.
Specified by:
Returns:
the head of this deque
Throws:
Description copied from interface:
Deque
Retrieves and removes the last element of this deque. This method
differs from
pollLast only in that it throws an
exception if this deque is empty.
Specified by:
Returns:
the tail of this deque
Throws:
Description copied from interface:
Deque
Retrieves and removes the first element of this deque,
or returns null if this deque is empty.
Specified by:
Returns:
the head of this deque, or null if this deque is empty
Description copied from interface:
Deque
Retrieves and removes the last element of this deque,
or returns null if this deque is empty.
Specified by:
Returns:
the tail of this deque, or null if this deque is empty
Retrieves and removes the first element of this deque, waiting
if necessary until an element becomes available.
Specified by:
Returns:
the head of this deque
Throws:
Retrieves and removes the last element of this deque, waiting
if necessary until an element becomes available.
Specified by:
Returns:
the tail of this deque
Throws:
Retrieves and removes the first element of this deque, waiting
up to the specified wait time if necessary for an element to
become available.
Specified by:
Parameters:
timeout - how long to wait before giving up, in units of
unit
unit - a TimeUnit determining how to interpret the
timeout parameter
Returns:
the head of this deque, or null if the specified
waiting time elapses before an element is available
Throws:
Retrieves and removes the last element of this deque, waiting
up to the specified wait time if necessary for an element to
become available.
Specified by:
Parameters:
timeout - how long to wait before giving up, in units of
unit
unit - a TimeUnit determining how to interpret the
timeout parameter
Returns:
the tail of this deque, or null if the specified
waiting time elapses before an element is available
Throws:
Description copied from interface:
Deque
Retrieves, but does not remove, the first element of this deque.
This method differs from
peekFirst only in that it
throws an exception if this deque is empty.
Specified by:
Returns:
the head of this deque
Throws:
Description copied from interface:
Deque
Retrieves, but does not remove, the last element of this deque.
This method differs from
peekLast only in that it
throws an exception if this deque is empty.
Specified by:
Returns:
the tail of this deque
Throws:
Description copied from interface:
Deque
Retrieves, but does not remove, the first element of this deque,
or returns null if this deque is empty.
Specified by:
Returns:
the head of this deque, or null if this deque is empty
Description copied from interface:
Deque
Retrieves, but does not remove, the last element of this deque,
or returns null if this deque is empty.
Specified by:
Returns:
the tail of this deque, or null if this deque is empty
public boolean removeFirstOccurrence |
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Removes the first occurrence of the specified element from this deque.
If the deque does not contain the element, it is unchanged.
More formally, removes the first element e such that
o.equals(e) (if such an element exists).
Returns true if this deque contained the specified element
(or equivalently, if this deque changed as a result of the call).
Specified by:
Parameters:
o - element to be removed from this deque, if present
Returns:
true if an element was removed as a result of this call
public boolean removeLastOccurrence |
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Removes the last occurrence of the specified element from this deque.
If the deque does not contain the element, it is unchanged.
More formally, removes the last element e such that
o.equals(e) (if such an element exists).
Returns true if this deque contained the specified element
(or equivalently, if this deque changed as a result of the call).
Specified by:
Parameters:
o - element to be removed from this deque, if present
Returns:
true if an element was removed as a result of this call
Inserts the specified element at the end of this deque unless it would
violate capacity restrictions. When using a capacity-restricted deque,
it is generally preferable to use method
offer.
This method is equivalent to addLast(E).
Specified by:
Overrides:
Parameters:
e - the element to add
Returns:
Throws:
Description copied from interface:
Queue
Inserts the specified element into this queue if it is possible to do
so immediately without violating capacity restrictions.
When using a capacity-restricted queue, this method is generally
preferable to
Queue.add(E), which can fail to insert an element only
by throwing an exception.
Specified by:
Parameters:
e - the element to add
Returns:
true if the element was added to this queue, else
false
Throws:
Inserts the specified element into the queue represented by this deque
(in other words, at the tail of this deque), waiting if necessary for
space to become available.
This method is equivalent to putLast.
Specified by:
Parameters:
e - the element to add
Throws:
public boolean offer |
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throws |
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Inserts the specified element into the queue represented by this deque
(in other words, at the tail of this deque), waiting up to the
specified wait time if necessary for space to become available.
This method is equivalent to
offerLast.
Specified by:
Parameters:
e - the element to add
timeout - how long to wait before giving up, in units of
unit
unit - a TimeUnit determining how to interpret the
timeout parameter
Returns:
true if the element was added to this deque, else
false
Throws:
Retrieves and removes the head of the queue represented by this deque.
This method differs from
poll() only in that it throws an
exception if this deque is empty.
This method is equivalent to removeFirst.
Specified by:
Overrides:
Returns:
the head of the queue represented by this deque
Throws:
Description copied from interface:
Queue
Retrieves and removes the head of this queue,
or returns null if this queue is empty.
Specified by:
Returns:
the head of this queue, or null if this queue is empty
Retrieves and removes the head of the queue represented by this deque
(in other words, the first element of this deque), waiting if
necessary until an element becomes available.
This method is equivalent to takeFirst.
Specified by:
Returns:
the head of this deque
Throws:
Retrieves and removes the head of the queue represented by this deque
(in other words, the first element of this deque), waiting up to the
specified wait time if necessary for an element to become available.
This method is equivalent to
pollFirst.
Specified by:
Parameters:
timeout - how long to wait before giving up, in units of
unit
unit - a TimeUnit determining how to interpret the
timeout parameter
Returns:
the head of this deque, or null if the
specified waiting time elapses before an element is available
Throws:
Retrieves, but does not remove, the head of the queue represented by
this deque. This method differs from
peek() only in that
it throws an exception if this deque is empty.
This method is equivalent to getFirst.
Specified by:
Overrides:
Returns:
the head of the queue represented by this deque
Throws:
Description copied from interface:
Queue
Retrieves, but does not remove, the head of this queue,
or returns null if this queue is empty.
Specified by:
Returns:
the head of this queue, or null if this queue is empty
public int remainingCapacity |
() |
Returns the number of additional elements that this deque can ideally
(in the absence of memory or resource constraints) accept without
blocking. This is always equal to the initial capacity of this deque
less the current
size of this deque.
Note that you cannot always tell if an attempt to insert
an element will succeed by inspecting remainingCapacity
because it may be the case that another thread is about to
insert or remove an element.
Specified by:
Returns:
the remaining capacity
Removes all available elements from this queue and adds them
to the given collection. This operation may be more
efficient than repeatedly polling this queue. A failure
encountered while attempting to add elements to
collection c may result in elements being in neither,
either or both collections when the associated exception is
thrown. Attempts to drain a queue to itself result in
IllegalArgumentException. Further, the behavior of
this operation is undefined if the specified collection is
modified while the operation is in progress.
Specified by:
Parameters:
c - the collection to transfer elements into
Returns:
the number of elements transferred
Throws:
UnsupportedOperationException - if addition of elements
is not supported by the specified collection
ClassCastException - if the class of an element of this queue
prevents it from being added to the specified collection
IllegalArgumentException - if the specified collection is this
queue, or some property of an element of this queue prevents
it from being added to the specified collection
Removes at most the given number of available elements from
this queue and adds them to the given collection. A failure
encountered while attempting to add elements to
collection c may result in elements being in neither,
either or both collections when the associated exception is
thrown. Attempts to drain a queue to itself result in
IllegalArgumentException. Further, the behavior of
this operation is undefined if the specified collection is
modified while the operation is in progress.
Specified by:
Parameters:
c - the collection to transfer elements into
maxElements - the maximum number of elements to transfer
Returns:
the number of elements transferred
Throws:
UnsupportedOperationException - if addition of elements
is not supported by the specified collection
ClassCastException - if the class of an element of this queue
prevents it from being added to the specified collection
IllegalArgumentException - if the specified collection is this
queue, or some property of an element of this queue prevents
it from being added to the specified collection
Pushes an element onto the stack represented by this deque (in other
words, at the head of this deque) if it is possible to do so
immediately without violating capacity restrictions, throwing an
IllegalStateException if no space is currently available.
This method is equivalent to addFirst.
Specified by:
Parameters:
e - the element to push
Throws:
Description copied from interface:
Deque
Pops an element from the stack represented by this deque. In other
words, removes and returns the first element of this deque.
This method is equivalent to Deque.removeFirst().
Specified by:
Returns:
the element at the front of this deque (which is the top
of the stack represented by this deque)
Throws:
Removes the first occurrence of the specified element from this deque.
If the deque does not contain the element, it is unchanged.
More formally, removes the first element
e such that
o.equals(e) (if such an element exists).
Returns
true if this deque contained the specified element
(or equivalently, if this deque changed as a result of the call).
This method is equivalent to
removeFirstOccurrence.
Specified by:
Overrides:
Parameters:
o - element to be removed from this deque, if present
Returns:
true if this deque changed as a result of the call
Returns the number of elements in this deque.
Specified by:
Overrides:
Returns:
the number of elements in this deque
Returns
true if this deque contains the specified element.
More formally, returns
true if and only if this deque contains
at least one element
e such that
o.equals(e).
Specified by:
Overrides:
Parameters:
o - object to be checked for containment in this deque
Returns:
true if this deque contains the specified element
Appends all of the elements in the specified collection to the end of
this deque, in the order that they are returned by the specified
collection's iterator. Attempts to
addAll of a deque to
itself result in
IllegalArgumentException.
Specified by:
Overrides:
Parameters:
c - the elements to be inserted into this deque
Returns:
true if this deque changed as a result of the call
Throws:
See Also:
Returns an array containing all of the elements in this deque, in
proper sequence (from first to last element).
The returned array will be "safe" in that no references to it are
maintained by this deque. (In other words, this method must allocate
a new array). The caller is thus free to modify the returned array.
This method acts as bridge between array-based and collection-based
APIs.
Specified by:
Overrides:
Returns:
an array containing all of the elements in this deque
Returns an array containing all of the elements in this deque, in
proper sequence; the runtime type of the returned array is that of
the specified array. If the deque fits in the specified array, it
is returned therein. Otherwise, a new array is allocated with the
runtime type of the specified array and the size of this deque.
If this deque fits in the specified array with room to spare
(i.e., the array has more elements than this deque), the element in
the array immediately following the end of the deque is set to
null.
Like the toArray() method, this method acts as bridge between
array-based and collection-based APIs. Further, this method allows
precise control over the runtime type of the output array, and may,
under certain circumstances, be used to save allocation costs.
Suppose x is a deque known to contain only strings.
The following code can be used to dump the deque into a newly
allocated array of String:
String[] y = x.toArray(new String[0]);
Note that
toArray(new Object[0]) is identical in function to
toArray().
Specified by:
Overrides:
Type Parameters:
T - the component type of the array to contain the collection
Parameters:
a - the array into which the elements of the deque are to
be stored, if it is big enough; otherwise, a new array of the
same runtime type is allocated for this purpose
Returns:
an array containing all of the elements in this deque
Throws:
ArrayStoreException - if the runtime type of the specified array
is not a supertype of the runtime type of every element in
this deque
Returns a string representation of this collection. The string
representation consists of a list of the collection's elements in the
order they are returned by its iterator, enclosed in square brackets
(
"[]"). Adjacent elements are separated by the characters
", " (comma and space). Elements are converted to strings as
by
String.valueOf(Object).
Overrides:
Returns:
a string representation of this collection
Atomically removes all of the elements from this deque.
The deque will be empty after this call returns.
Specified by:
Overrides:
Returns an iterator over the elements in this deque in proper sequence.
The elements will be returned in order from first (head) to last (tail).
The returned iterator is
weakly consistent.
Specified by:
Overrides:
Returns:
an iterator over the elements in this deque in proper sequence
Returns an iterator over the elements in this deque in reverse
sequential order. The elements will be returned in order from
last (tail) to first (head).
The returned iterator is
weakly consistent.
Specified by:
Returns:
an iterator over the elements in this deque in reverse order
Description copied from interface:
Iterable
Performs the given action for each element of the
Iterable
until all elements have been processed or the action throws an
exception. Actions are performed in the order of iteration, if that
order is specified. Exceptions thrown by the action are relayed to the
caller.
The behavior of this method is unspecified if the action performs
side-effects that modify the underlying source of elements, unless an
overriding class has specified a concurrent modification policy.
Specified by:
Parameters:
action - The action to be performed for each element
Throws:
Removes all of the elements of this collection that satisfy the given
predicate. Errors or runtime exceptions thrown during iteration or by
the predicate are relayed to the caller.
Specified by:
Parameters:
filter - a predicate which returns true for elements to be
removed
Returns:
true if any elements were removed
Throws:
Removes all of this collection's elements that are also contained in the
specified collection (optional operation). After this call returns,
this collection will contain no elements in common with the specified
collection.
Specified by:
Overrides:
Parameters:
c - collection containing elements to be removed from this collection
Returns:
true if this collection changed as a result of the
call
Throws:
NullPointerException - if this collection contains one or more
null elements and the specified collection does not support
null elements
(
optional),
or if the specified collection is null
See Also:
Retains only the elements in this collection that are contained in the
specified collection (optional operation). In other words, removes from
this collection all of its elements that are not contained in the
specified collection.
Specified by:
Overrides:
Parameters:
c - collection containing elements to be retained in this collection
Returns:
true if this collection changed as a result of the call
Throws:
NullPointerException - if this collection contains one or more
null elements and the specified collection does not permit null
elements
(
optional),
or if the specified collection is null
See Also:
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