public class LinkedQueue extends Object implements Channel
Modifier and Type | Field and Description |
---|---|
protected LinkedNode |
head_
Dummy header node of list.
|
protected LinkedNode |
last_
The last node of list.
|
protected Object |
putLock_
Helper monitor for managing access to last node.
|
protected int |
waitingForTake_
The number of threads waiting for a take.
|
Constructor and Description |
---|
LinkedQueue() |
Modifier and Type | Method and Description |
---|---|
protected Object |
extract()
Main mechanics for take/poll
|
protected void |
insert(Object x)
Main mechanics for put/offer
|
boolean |
isEmpty() |
boolean |
offer(Object x,
long msecs)
Place item in channel only if it can be accepted within
msecs milliseconds.
|
Object |
peek()
Return, but do not remove object at head of Channel,
or null if it is empty.
|
Object |
poll(long msecs)
Return and remove an item from channel only if one is available within
msecs milliseconds.
|
void |
put(Object x)
Place item in the channel, possibly waiting indefinitely until
it can be accepted.
|
Object |
take()
Return and remove an item from channel,
possibly waiting indefinitely until
such an item exists.
|
protected LinkedNode head_
protected final Object putLock_
protected LinkedNode last_
protected int waitingForTake_
protected void insert(Object x)
protected Object extract()
public void put(Object x) throws InterruptedException
Channel
put
in interface Channel
put
in interface Puttable
x
- the element to be inserted. Should be non-null.InterruptedException
- if the current thread has
been interrupted at a point at which interruption
is detected, in which case the element is guaranteed not
to be inserted. Otherwise, on normal return, the element is guaranteed
to have been inserted.public boolean offer(Object x, long msecs) throws InterruptedException
Channel
offer
in interface Channel
offer
in interface Puttable
x
- the element to be inserted. Should be non-null.msecs
- the number of milliseconds to wait. If less than
or equal to zero, the method does not perform any timed waits,
but might still require
access to a synchronization lock, which can impose unbounded
delay if there is a lot of contention for the channel.InterruptedException
- if the current thread has
been interrupted at a point at which interruption
is detected, in which case the element is guaranteed not
to be inserted (i.e., is equivalent to a false return).public Object take() throws InterruptedException
Channel
take
in interface Channel
take
in interface Takable
InterruptedException
- if the current thread has
been interrupted at a point at which interruption
is detected, in which case state of the channel is unchanged.public Object peek()
Channel
public boolean isEmpty()
public Object poll(long msecs) throws InterruptedException
Channel
poll
in interface Channel
poll
in interface Takable
msecs
- the number of milliseconds to wait. If less than
or equal to zero, the operation does not perform any timed waits,
but might still require
access to a synchronization lock, which can impose unbounded
delay if there is a lot of contention for the channel.InterruptedException
- if the current thread has
been interrupted at a point at which interruption
is detected, in which case state of the channel is unchanged
(i.e., equivalent to a null return).Copyright © 2002–2016. All rights reserved.