PriorityBlockingQueue Class
Definition
Important
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An unbounded BlockingQueue blocking queue that uses
the same ordering rules as class PriorityQueue and supplies
blocking retrieval operations.
[Android.Runtime.Register("java/util/concurrent/PriorityBlockingQueue", DoNotGenerateAcw=true)]
[Java.Interop.JavaTypeParameters(new System.String[] { "E" })]
public class PriorityBlockingQueue : Java.Util.AbstractQueue, IDisposable, Java.Interop.IJavaPeerable, Java.IO.ISerializable, Java.Util.Concurrent.IBlockingQueue[<Android.Runtime.Register("java/util/concurrent/PriorityBlockingQueue", DoNotGenerateAcw=true)>]
[<Java.Interop.JavaTypeParameters(new System.String[] { "E" })>]
type PriorityBlockingQueue = class
inherit AbstractQueue
interface ISerializable
interface IJavaObject
interface IDisposable
interface IJavaPeerable
interface IBlockingQueue
interface IQueue
interface ICollection
interface IIterable- Inheritance
- Attributes
- Implements
Remarks
An unbounded BlockingQueue blocking queue that uses the same ordering rules as class PriorityQueue and supplies blocking retrieval operations. While this queue is logically unbounded, attempted additions may fail due to resource exhaustion (causing OutOfMemoryError). This class does not permit null elements. A priority queue relying on Comparable natural ordering also does not permit insertion of non-comparable objects (doing so results in ClassCastException).
This class and its iterator implement all of the <em>optional</em> methods of the Collection and Iterator interfaces. The Iterator provided in method #iterator() and the Spliterator provided in method #spliterator() are <em>not</em> guaranteed to traverse the elements of the PriorityBlockingQueue in any particular order. If you need ordered traversal, consider using Arrays.sort(pq.toArray()). Also, method drainTo can be used to <em>remove</em> some or all elements in priority order and place them in another collection.
Operations on this class make no guarantees about the ordering of elements with equal priority. If you need to enforce an ordering, you can define custom classes or comparators that use a secondary key to break ties in primary priority values. For example, here is a class that applies first-in-first-out tie-breaking to comparable elements. To use it, you would insert a new FIFOEntry(anEntry) instead of a plain entry object.
{@code
class FIFOEntry<E extends Comparable<? super E>>
implements Comparable<FIFOEntry<E>> {
static final AtomicLong seq = new AtomicLong();
final long seqNum;
final E entry;
public FIFOEntry(E entry) {
seqNum = seq.getAndIncrement();
this.entry = entry;
}
public E getEntry() { return entry; }
public int compareTo(FIFOEntry<E> other) {
int res = entry.compareTo(other.entry);
if (res == 0 && other.entry != this.entry)
res = (seqNum < other.seqNum ? -1 : 1);
return res;
}
}}
This class is a member of the Java Collections Framework.
Added in 1.5.
Java documentation for java.util.concurrent.PriorityBlockingQueue.
Portions of this page are modifications based on work created and shared by the Android Open Source Project and used according to terms described in the Creative Commons 2.5 Attribution License.
Constructors
| PriorityBlockingQueue() |
Creates a |
| PriorityBlockingQueue(ICollection) |
Creates a |
| PriorityBlockingQueue(Int32) |
Creates a |
| PriorityBlockingQueue(Int32, IComparator) |
Creates a |
| PriorityBlockingQueue(IntPtr, JniHandleOwnership) |
A constructor used when creating managed representations of JNI objects; called by the runtime. |
Properties
| Class |
Returns the runtime class of this |
| Handle |
The handle to the underlying Android instance. (Inherited from Object) |
| IsEmpty |
To be added (Inherited from AbstractCollection) |
| JniIdentityHashCode | (Inherited from Object) |
| JniPeerMembers | |
| PeerReference | (Inherited from Object) |
| ThresholdClass |
This API supports the Mono for Android infrastructure and is not intended to be used directly from your code. |
| ThresholdType |
This API supports the Mono for Android infrastructure and is not intended to be used directly from your code. |
Methods
| Add(Object) |
To be added (Inherited from AbstractCollection) |
| AddAll(ICollection) |
To be added (Inherited from AbstractCollection) |
| Clear() |
To be added (Inherited from AbstractCollection) |
| Clone() |
Creates and returns a copy of this object. (Inherited from Object) |
| Comparator() |
Returns the comparator used to order the elements in this queue,
or |
| Contains(Object) |
To be added (Inherited from AbstractCollection) |
| ContainsAll(ICollection) |
To be added (Inherited from AbstractCollection) |
| Dispose() | (Inherited from Object) |
| Dispose(Boolean) | (Inherited from Object) |
| DrainTo(ICollection) | |
| DrainTo(ICollection, Int32) | |
| Element() |
Retrieves, but does not remove, the head of this queue. (Inherited from AbstractQueue) |
| Equals(Object) |
Indicates whether some other object is "equal to" this one. (Inherited from Object) |
| ForEach(IConsumer) | |
| GetHashCode() |
Returns a hash code value for the object. (Inherited from Object) |
| Iterator() |
Returns an iterator over the elements in this queue. |
| JavaFinalize() |
Called by the garbage collector on an object when garbage collection determines that there are no more references to the object. (Inherited from Object) |
| Notify() |
Wakes up a single thread that is waiting on this object's monitor. (Inherited from Object) |
| NotifyAll() |
Wakes up all threads that are waiting on this object's monitor. (Inherited from Object) |
| Offer(Object) |
Inserts the specified element into this priority queue. |
| Offer(Object, Int64, TimeUnit) |
Inserts the specified element into this priority queue. |
| Peek() |
Retrieves, but does not remove, the head of this queue,
or returns |
| Poll() |
Retrieves and removes the head of this queue,
or returns |
| Poll(Int64, TimeUnit) |
Retrieves and removes the head of this queue, waiting up to the specified wait time if necessary for an element to become available. |
| Put(Object) |
Inserts the specified element into this priority queue. |
| RemainingCapacity() |
Always returns |
| Remove() |
Retrieves and removes the head of this queue. (Inherited from AbstractQueue) |
| Remove(Object) |
To be added (Inherited from AbstractCollection) |
| RemoveAll(ICollection) |
To be added (Inherited from AbstractCollection) |
| RemoveIf(IPredicate) | |
| RetainAll(ICollection) |
To be added (Inherited from AbstractCollection) |
| SetHandle(IntPtr, JniHandleOwnership) |
Sets the Handle property. (Inherited from Object) |
| Size() |
Returns a count of how many objects this |
| Spliterator() |
Returns a |
| Take() |
Retrieves and removes the head of this queue, waiting if necessary until an element becomes available. |
| ToArray() |
To be added (Inherited from AbstractCollection) |
| ToArray(Object[]) |
To be added (Inherited from AbstractCollection) |
| ToArray<T>() | (Inherited from Object) |
| ToString() |
Returns a string representation of the object. (Inherited from Object) |
| UnregisterFromRuntime() | (Inherited from Object) |
| Wait() |
Causes the current thread to wait until it is awakened, typically by being <em>notified</em> or <em>interrupted</em>. (Inherited from Object) |
| Wait(Int64) |
Causes the current thread to wait until it is awakened, typically by being <em>notified</em> or <em>interrupted</em>, or until a certain amount of real time has elapsed. (Inherited from Object) |
| Wait(Int64, Int32) |
Causes the current thread to wait until it is awakened, typically by being <em>notified</em> or <em>interrupted</em>, or until a certain amount of real time has elapsed. (Inherited from Object) |
Explicit Interface Implementations
| IJavaPeerable.Disposed() | (Inherited from Object) |
| IJavaPeerable.DisposeUnlessReferenced() | (Inherited from Object) |
| IJavaPeerable.Finalized() | (Inherited from Object) |
| IJavaPeerable.JniManagedPeerState | (Inherited from Object) |
| IJavaPeerable.SetJniIdentityHashCode(Int32) | (Inherited from Object) |
| IJavaPeerable.SetJniManagedPeerState(JniManagedPeerStates) | (Inherited from Object) |
| IJavaPeerable.SetPeerReference(JniObjectReference) | (Inherited from Object) |