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-rw-r--r--libparc/examples/How To Create an Object Pool/parc_SimpleBufferPool.c107
1 files changed, 107 insertions, 0 deletions
diff --git a/libparc/examples/How To Create an Object Pool/parc_SimpleBufferPool.c b/libparc/examples/How To Create an Object Pool/parc_SimpleBufferPool.c
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+++ b/libparc/examples/How To Create an Object Pool/parc_SimpleBufferPool.c
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+/*
+ * Copyright (c) 2017 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <stdio.h>
+
+#include <parc/algol/parc_Object.h>
+#include <parc/algol/parc_DisplayIndented.h>
+#include <parc/algol/parc_Memory.h>
+
+#include <parc/algol/parc_LinkedList.h>
+
+#include "parc_SimpleBufferPool.h"
+
+struct PARCSimpleBufferPool {
+ size_t bufferSize;
+ size_t limit;
+ PARCLinkedList *freeList;
+ PARCObjectDescriptor *descriptor;
+};
+
+static bool
+_parcSimpleBufferPool_Destructor(PARCSimpleBufferPool **instancePtr)
+{
+ assertNotNull(instancePtr, "Parameter must be a non-null pointer to a PARCSimpleBufferPool pointer.");
+
+ PARCSimpleBufferPool *pool = *instancePtr;
+
+ parcLinkedList_Apply(pool->freeList, (void (*))parcObject_SetDescriptor, (const void *) &PARCBuffer_Descriptor);
+
+ parcLinkedList_Release(&pool->freeList);
+
+ return true;
+}
+
+static bool
+_parcSimpleBufferPool_BufferDestructor(PARCBuffer **bufferPtr)
+{
+ PARCBuffer *buffer = *bufferPtr;
+ *bufferPtr = 0;
+
+ PARCSimpleBufferPool *bufferPool = parcObjectDescriptor_GetTypeState(parcObject_GetDescriptor(buffer));
+
+ if (bufferPool->limit > parcLinkedList_Size(bufferPool->freeList)) {
+ parcLinkedList_Append(bufferPool->freeList, buffer);
+ } else {
+ parcBuffer_Acquire(buffer);
+ parcObject_SetDescriptor(buffer, &parcObject_DescriptorName(PARCBuffer));
+ parcBuffer_Release(&buffer);
+ }
+
+ return false;
+}
+
+parcObject_ImplementAcquire(parcSimpleBufferPool, PARCSimpleBufferPool);
+
+parcObject_ImplementRelease(parcSimpleBufferPool, PARCSimpleBufferPool);
+
+parcObject_Override(PARCSimpleBufferPool, PARCObject,
+ .destructor = (PARCObjectDestructor *) _parcSimpleBufferPool_Destructor);
+
+PARCSimpleBufferPool *
+parcSimpleBufferPool_Create(size_t limit, size_t bufferSize)
+{
+ PARCSimpleBufferPool *result = parcObject_CreateInstance(PARCSimpleBufferPool);
+
+ if (result != NULL) {
+ result->limit = limit;
+ result->bufferSize = bufferSize;
+ result->freeList = parcLinkedList_Create();
+
+ char *string;
+ asprintf(&string, "PARCSimpleBufferPool=%zu", bufferSize);
+ result->descriptor = parcObjectDescriptor_CreateExtension(&parcObject_DescriptorName(PARCBuffer), string);
+ free(string);
+ result->descriptor->destructor = (PARCObjectDestructor *) _parcSimpleBufferPool_BufferDestructor;
+ result->descriptor->typeState = (PARCObjectTypeState *) result;
+ }
+
+ return result;
+}
+
+PARCBuffer *
+parcSimpleBufferPool_GetInstance(PARCSimpleBufferPool *bufferPool)
+{
+ PARCBuffer *result;
+
+ if (parcLinkedList_Size(bufferPool->freeList) > 0) {
+ result = parcLinkedList_RemoveFirst(bufferPool->freeList);
+ } else {
+ result = parcBuffer_Allocate(bufferPool->bufferSize);
+ parcObject_SetDescriptor(result, bufferPool->descriptor);
+ }
+
+ return result;
+}