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Clean up GenerationCache.

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Use const references to keys and values where appropriate to avoid
copying them unnecessarily.

Deleted some dead code.

Simplified a few pieces that were doing unnecessary redundant work.

Change-Id: Ib2145b7094a40db2d679e05dafe050fe1e87b846
This commit is contained in:
Jeff Brown 2011-11-11 15:40:13 -08:00
parent 8a566dc98f
commit b4293fe408
1 changed files with 49 additions and 59 deletions
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100
include/utils/GenerationCache.h
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@ -34,17 +34,17 @@ public:
template<typename EntryKey, typename EntryValue>
struct Entry: public LightRefBase<Entry<EntryKey, EntryValue> > {
Entry() { }
Entry(const Entry<EntryKey, EntryValue>& e) :
key(e.key), value(e.value), parent(e.parent), child(e.child) { }
Entry(sp<Entry<EntryKey, EntryValue> > e):
key(e->key), value(e->value), parent(e->parent), child(e->child) { }
key(e.key), value(e.value),
parent(e.parent), child(e.child) { }
Entry(const EntryKey& key, const EntryValue& value) :
key(key), value(value) { }
EntryKey key;
EntryValue value;
sp<Entry<EntryKey, EntryValue> > parent;
sp<Entry<EntryKey, EntryValue> > child;
sp<Entry<EntryKey, EntryValue> > parent; // next older entry
sp<Entry<EntryKey, EntryValue> > child; // next younger entry
}; // struct Entry
/**
@ -62,23 +62,20 @@ public:
void setOnEntryRemovedListener(OnEntryRemoved<K, V>* listener);
size_t size() const;
void clear();
bool contains(K key) const;
V get(K key);
K getKeyAt(uint32_t index) const;
bool put(K key, V value);
V remove(K key);
V removeOldest();
V getValueAt(uint32_t index) const;
bool contains(const K& key) const;
const K& getKeyAt(size_t index) const;
const V& getValueAt(size_t index) const;
uint32_t size() const;
const V& get(const K& key);
bool put(const K& key, const V& value);
void addToCache(sp<Entry<K, V> > entry, K key, V value);
void attachToCache(sp<Entry<K, V> > entry);
void detachFromCache(sp<Entry<K, V> > entry);
V removeAt(ssize_t index);
void removeAt(ssize_t index);
bool remove(const K& key);
bool removeOldest();
private:
KeyedVector<K, sp<Entry<K, V> > > mCache;
@ -88,6 +85,9 @@ private:
sp<Entry<K, V> > mOldest;
sp<Entry<K, V> > mYoungest;
void attachToCache(const sp<Entry<K, V> >& entry);
void detachFromCache(const sp<Entry<K, V> >& entry);
}; // class GenerationCache
template<typename K, typename V>
@ -130,45 +130,44 @@ void GenerationCache<K, V>::clear() {
}
template<typename K, typename V>
bool GenerationCache<K, V>::contains(K key) const {
bool GenerationCache<K, V>::contains(const K& key) const {
return mCache.indexOfKey(key) >= 0;
}
template<typename K, typename V>
K GenerationCache<K, V>::getKeyAt(uint32_t index) const {
const K& GenerationCache<K, V>::getKeyAt(size_t index) const {
return mCache.keyAt(index);
}
template<typename K, typename V>
V GenerationCache<K, V>::getValueAt(uint32_t index) const {
const V& GenerationCache<K, V>::getValueAt(size_t index) const {
return mCache.valueAt(index)->value;
}
template<typename K, typename V>
V GenerationCache<K, V>::get(K key) {
const V& GenerationCache<K, V>::get(const K& key) {
ssize_t index = mCache.indexOfKey(key);
if (index >= 0) {
sp<Entry<K, V> > entry = mCache.valueAt(index);
if (entry.get()) {
const sp<Entry<K, V> >& entry = mCache.valueAt(index);
detachFromCache(entry);
attachToCache(entry);
return entry->value;
}
}
return NULL;
}
template<typename K, typename V>
bool GenerationCache<K, V>::put(K key, V value) {
bool GenerationCache<K, V>::put(const K& key, const V& value) {
if (mMaxCapacity != kUnlimitedCapacity && mCache.size() >= mMaxCapacity) {
removeOldest();
}
ssize_t index = mCache.indexOfKey(key);
if (index < 0) {
sp<Entry<K, V> > entry = new Entry<K, V>;
addToCache(entry, key, value);
sp<Entry<K, V> > entry = new Entry<K, V>(key, value);
mCache.add(key, entry);
attachToCache(entry);
return true;
}
@ -176,49 +175,44 @@ bool GenerationCache<K, V>::put(K key, V value) {
}
template<typename K, typename V>
void GenerationCache<K, V>::addToCache(sp<Entry<K, V> > entry, K key, V value) {
entry->key = key;
entry->value = value;
mCache.add(key, entry);
attachToCache(entry);
}
template<typename K, typename V>
V GenerationCache<K, V>::remove(K key) {
bool GenerationCache<K, V>::remove(const K& key) {
ssize_t index = mCache.indexOfKey(key);
if (index >= 0) {
return removeAt(index);
removeAt(index);
return true;
}
return NULL;
return false;
}
template<typename K, typename V>
V GenerationCache<K, V>::removeAt(ssize_t index) {
void GenerationCache<K, V>::removeAt(ssize_t index) {
sp<Entry<K, V> > entry = mCache.valueAt(index);
if (mListener) {
(*mListener)(entry->key, entry->value);
}
mCache.removeItemsAt(index, 1);
detachFromCache(entry);
return entry->value;
}
template<typename K, typename V>
V GenerationCache<K, V>::removeOldest() {
bool GenerationCache<K, V>::removeOldest() {
if (mOldest.get()) {
ssize_t index = mCache.indexOfKey(mOldest->key);
if (index >= 0) {
return removeAt(index);
removeAt(index);
return true;
}
LOGE("GenerationCache: removeOldest failed to find the item in the cache "
"with the given key, but we know it must be in there. "
"Is the key comparator kaput?");
}
return NULL;
return false;
}
template<typename K, typename V>
void GenerationCache<K, V>::attachToCache(sp<Entry<K, V> > entry) {
void GenerationCache<K, V>::attachToCache(const sp<Entry<K, V> >& entry) {
if (!mYoungest.get()) {
mYoungest = mOldest = entry;
} else {
@ -229,20 +223,16 @@ void GenerationCache<K, V>::attachToCache(sp<Entry<K, V> > entry) {
}
template<typename K, typename V>
void GenerationCache<K, V>::detachFromCache(sp<Entry<K, V> > entry) {
void GenerationCache<K, V>::detachFromCache(const sp<Entry<K, V> >& entry) {
if (entry->parent.get()) {
entry->parent->child = entry->child;
} else {
mOldest = entry->child;
}
if (entry->child.get()) {
entry->child->parent = entry->parent;
}
if (mOldest == entry) {
mOldest = entry->child;
}
if (mYoungest == entry) {
} else {
mYoungest = entry->parent;
}