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      1 /*
      2  * Copyright (C) 2010 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #include "ResourceCache.h"
     18 #include "Caches.h"
     19 
     20 namespace android {
     21 
     22 using namespace uirenderer;
     23 ANDROID_SINGLETON_STATIC_INSTANCE(ResourceCache);
     24 
     25 namespace uirenderer {
     26 
     27 ///////////////////////////////////////////////////////////////////////////////
     28 // Resource cache
     29 ///////////////////////////////////////////////////////////////////////////////
     30 
     31 void ResourceCache::logCache() {
     32     ALOGD("ResourceCache: cacheReport:");
     33     for (size_t i = 0; i < mCache->size(); ++i) {
     34         ResourceReference* ref = mCache->valueAt(i);
     35         ALOGD("  ResourceCache: mCache(%zu): resource, ref = 0x%p, 0x%p", i, mCache->keyAt(i),
     36               mCache->valueAt(i));
     37         ALOGD("  ResourceCache: mCache(%zu): refCount, destroyed, type = %d, %d, %d", i,
     38               ref->refCount, ref->destroyed, ref->resourceType);
     39     }
     40 }
     41 
     42 ResourceCache::ResourceCache() {
     43     Mutex::Autolock _l(mLock);
     44     mCache = new KeyedVector<const void*, ResourceReference*>();
     45 }
     46 
     47 ResourceCache::~ResourceCache() {
     48     Mutex::Autolock _l(mLock);
     49     delete mCache;
     50 }
     51 
     52 void ResourceCache::lock() {
     53     mLock.lock();
     54 }
     55 
     56 void ResourceCache::unlock() {
     57     mLock.unlock();
     58 }
     59 
     60 void ResourceCache::incrementRefcount(void* resource, ResourceType resourceType) {
     61     Mutex::Autolock _l(mLock);
     62     incrementRefcountLocked(resource, resourceType);
     63 }
     64 
     65 void ResourceCache::incrementRefcount(const Res_png_9patch* patchResource) {
     66     incrementRefcount((void*)patchResource, kNinePatch);
     67 }
     68 
     69 void ResourceCache::incrementRefcountLocked(void* resource, ResourceType resourceType) {
     70     ssize_t index = mCache->indexOfKey(resource);
     71     ResourceReference* ref = index >= 0 ? mCache->valueAt(index) : nullptr;
     72     if (ref == nullptr || mCache->size() == 0) {
     73         ref = new ResourceReference(resourceType);
     74         mCache->add(resource, ref);
     75     }
     76     ref->refCount++;
     77 }
     78 
     79 void ResourceCache::decrementRefcount(void* resource) {
     80     Mutex::Autolock _l(mLock);
     81     decrementRefcountLocked(resource);
     82 }
     83 
     84 void ResourceCache::decrementRefcount(const Res_png_9patch* patchResource) {
     85     decrementRefcount((void*)patchResource);
     86 }
     87 
     88 void ResourceCache::decrementRefcountLocked(void* resource) {
     89     ssize_t index = mCache->indexOfKey(resource);
     90     ResourceReference* ref = index >= 0 ? mCache->valueAt(index) : nullptr;
     91     if (ref == nullptr) {
     92         // Should not get here - shouldn't get a call to decrement if we're not yet tracking it
     93         return;
     94     }
     95     ref->refCount--;
     96     if (ref->refCount == 0) {
     97         deleteResourceReferenceLocked(resource, ref);
     98     }
     99 }
    100 
    101 void ResourceCache::decrementRefcountLocked(const Res_png_9patch* patchResource) {
    102     decrementRefcountLocked((void*)patchResource);
    103 }
    104 
    105 void ResourceCache::destructor(Res_png_9patch* resource) {
    106     Mutex::Autolock _l(mLock);
    107     destructorLocked(resource);
    108 }
    109 
    110 void ResourceCache::destructorLocked(Res_png_9patch* resource) {
    111     ssize_t index = mCache->indexOfKey(resource);
    112     ResourceReference* ref = index >= 0 ? mCache->valueAt(index) : nullptr;
    113     if (ref == nullptr) {
    114         // If we're not tracking this resource, just delete it
    115         if (Caches::hasInstance()) {
    116             Caches::getInstance().patchCache.removeDeferred(resource);
    117         } else {
    118             // A Res_png_9patch is actually an array of byte that's larger
    119             // than sizeof(Res_png_9patch). It must be freed as an array.
    120             delete[](int8_t*) resource;
    121         }
    122         return;
    123     }
    124     ref->destroyed = true;
    125     if (ref->refCount == 0) {
    126         deleteResourceReferenceLocked(resource, ref);
    127     }
    128 }
    129 
    130 /**
    131  * This method should only be called while the mLock mutex is held (that mutex is grabbed
    132  * by the various destructor() and recycle() methods which call this method).
    133  */
    134 void ResourceCache::deleteResourceReferenceLocked(const void* resource, ResourceReference* ref) {
    135     if (ref->destroyed) {
    136         switch (ref->resourceType) {
    137             case kNinePatch: {
    138                 if (Caches::hasInstance()) {
    139                     Caches::getInstance().patchCache.removeDeferred((Res_png_9patch*)resource);
    140                 } else {
    141                     // A Res_png_9patch is actually an array of byte that's larger
    142                     // than sizeof(Res_png_9patch). It must be freed as an array.
    143                     int8_t* patch = (int8_t*)resource;
    144                     delete[] patch;
    145                 }
    146             } break;
    147         }
    148     }
    149     mCache->removeItem(resource);
    150     delete ref;
    151 }
    152 
    153 };  // namespace uirenderer
    154 };  // namespace android
    155