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Cleanup Recycler to better encapsulate stuff (#9739)

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Motivation:

We can move some methods etc to make encapsulation better in Recycler

Modifications:

Move / rename methods to make usage more clear

Result:

Code cleanup
This commit is contained in:
Norman Maurer 2019-11-04 17:43:53 +01:00
parent 83b35db2e5
commit f0e1628426
1 changed files with 35 additions and 26 deletions
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61
common/src/main/java/io/netty/util/Recycler.java
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@ -269,28 +269,35 @@ public abstract class Recycler<T> {
head.next = null;
head = next;
}
if (reclaimSpace != 0) {
if (reclaimSpace > 0) {
reclaimSpace(reclaimSpace);
}
}
void reclaimSpace(int space) {
assert space >= 0;
private void reclaimSpace(int space) {
availableSharedCapacity.addAndGet(space);
}
boolean reserveSpace(int space) {
return reserveSpace(availableSharedCapacity, space);
void relink(Link link) {
reclaimSpace(LINK_CAPACITY);
this.link = link;
}
static boolean reserveSpace(AtomicInteger availableSharedCapacity, int space) {
assert space >= 0;
/**
* Creates a new {@link} and returns it if we can reserve enough space for it, otherwise it
* returns {@code null}.
*/
Link newLink() {
return reserveSpaceForLink(availableSharedCapacity) ? new Link() : null;
}
static boolean reserveSpaceForLink(AtomicInteger availableSharedCapacity) {
for (;;) {
int available = availableSharedCapacity.get();
if (available < space) {
if (available < LINK_CAPACITY) {
return false;
}
if (availableSharedCapacity.compareAndSet(available, available - space)) {
if (availableSharedCapacity.compareAndSet(available, available - LINK_CAPACITY)) {
return true;
}
}
@ -324,7 +331,11 @@ public abstract class Recycler<T> {
ratioMask = stack.ratioMask;
}
private static WeakOrderQueue newQueue(Stack<?> stack, Thread thread) {
static WeakOrderQueue newQueue(Stack<?> stack, Thread thread) {
// We allocated a Link so reserve the space
if (!Head.reserveSpaceForLink(stack.availableSharedCapacity)) {
return null;
}
final WeakOrderQueue queue = new WeakOrderQueue(stack, thread);
// Done outside of the constructor to ensure WeakOrderQueue.this does not escape the constructor and so
// may be accessed while its still constructed.
@ -342,15 +353,6 @@ public abstract class Recycler<T> {
this.next = next;
}
/**
* Allocate a new {@link WeakOrderQueue} or return {@code null} if not possible.
*/
static WeakOrderQueue allocate(Stack<?> stack, Thread thread) {
// We allocated a Link so reserve the space
return Head.reserveSpace(stack.availableSharedCapacity, LINK_CAPACITY)
? newQueue(stack, thread) : null;
}
void reclaimAllSpaceAndUnlink() {
head.reclaimAllSpaceAndUnlink();
this.next = null;
@ -370,12 +372,13 @@ public abstract class Recycler<T> {
Link tail = this.tail;
int writeIndex;
if ((writeIndex = tail.get()) == LINK_CAPACITY) {
if (!head.reserveSpace(LINK_CAPACITY)) {
Link link = head.newLink();
if (link == null) {
// Drop it.
return;
}
// We allocate a Link so reserve the space
this.tail = tail = tail.next = new Link();
this.tail = tail = tail.next = link;
writeIndex = tail.get();
}
@ -402,8 +405,8 @@ public abstract class Recycler<T> {
if (head.next == null) {
return false;
}
this.head.link = head = head.next;
this.head.reclaimSpace(LINK_CAPACITY);
head = head.next;
this.head.relink(head);
}
final int srcStart = head.readIndex;
@ -444,8 +447,7 @@ public abstract class Recycler<T> {
if (srcEnd == LINK_CAPACITY && head.next != null) {
// Add capacity back as the Link is GCed.
this.head.reclaimSpace(LINK_CAPACITY);
this.head.link = head.next;
this.head.relink(head.next);
}
head.readIndex = srcEnd;
@ -662,7 +664,7 @@ public abstract class Recycler<T> {
return;
}
// Check if we already reached the maximum number of delayed queues and if we can allocate at all.
if ((queue = WeakOrderQueue.allocate(this, thread)) == null) {
if ((queue = newWeakOrderQueue(thread)) == null) {
// drop object
return;
}
@ -675,6 +677,13 @@ public abstract class Recycler<T> {
queue.add(item);
}
/**
* Allocate a new {@link WeakOrderQueue} or return {@code null} if not possible.
*/
private WeakOrderQueue newWeakOrderQueue(Thread thread) {
return WeakOrderQueue.newQueue(this, thread);
}
boolean dropHandle(DefaultHandle<?> handle) {
if (!handle.hasBeenRecycled) {
if ((++handleRecycleCount & ratioMask) != 0) {