diff options
Diffstat (limited to 'libparc/examples')
7 files changed, 998 insertions, 0 deletions
diff --git a/libparc/examples/How To Create A Static PARC Object/main.c b/libparc/examples/How To Create A Static PARC Object/main.c new file mode 100755 index 00000000..00402170 --- /dev/null +++ b/libparc/examples/How To Create A Static PARC Object/main.c @@ -0,0 +1,108 @@ +/* + * 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_Memory.h> +#include "parc_MyObject.h" + +/* + * Three kinds of static PARC Objects + * + * static or global objects defined within a module + * + * local objects defined within a function. + * + */ + +PARCMyObject *globalObject = parcObject_Instance(PARCMyObject, sizeof(void*), PARCMyObjectSizeOf); + +void +aGlobalObject(void) +{ + int x = 1; + int y = 2; + double z = 3.14; + + parcObject_InitInstance(globalObject, PARCMyObject); + parcMyObject_Init(globalObject, x, y, z); + + parcMyObject_Display(globalObject, 0); + + parcMyObject_Release(&globalObject); +} + +static PARCMyObject *staticModuleObject = parcObject_Instance(PARCMyObject, sizeof(void*), PARCMyObjectSizeOf); + +void +aStaticModuleObject(void) +{ + int x = 1; + int y = 2; + double z = 3.14; + + parcObject_InitInstance(staticModuleObject, PARCMyObject); + parcMyObject_Init(staticModuleObject, x, y, z); + + parcMyObject_Display(staticModuleObject, 0); + + parcMyObject_Release(&staticModuleObject); +} + +void +aLocalObject(void) +{ + int x = 1; + int y = 2; + double z = 3.14; + + PARCMyObject *localObject = parcObject_Instance(PARCMyObject, sizeof(void*), PARCMyObjectSizeOf); + + parcObject_InitInstance(localObject, PARCMyObject); + parcMyObject_Init(localObject, x, y, z); + + parcMyObject_Display(localObject, 0); + + parcMyObject_Release(&localObject); +} + +void +aWrappedObject(void) +{ + int x = 1; + int y = 2; + double z = 3.14; + + PARCMyObject *wrappedObject = parcMyObject_Wrap((char[parcObject_TotalSize(sizeof(void*), PARCMyObjectSizeOf)]) { 0 }); + parcMyObject_Init(wrappedObject, x, y, z); + + parcMyObject_Display(wrappedObject, 0); + + parcMyObject_Release(&wrappedObject); +} + +int +main(int argc, const char *argv[argc]) +{ + aGlobalObject(); + + aStaticModuleObject(); + + aLocalObject(); + + aWrappedObject(); + + return 0; +} diff --git a/libparc/examples/How To Create A Static PARC Object/parc_MyObject.c b/libparc/examples/How To Create A Static PARC Object/parc_MyObject.c new file mode 100644 index 00000000..9523e494 --- /dev/null +++ b/libparc/examples/How To Create A Static PARC Object/parc_MyObject.c @@ -0,0 +1,178 @@ +/* + * 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 <config.h> + +#include <parc/algol/parc_Object.h> +#include <parc/algol/parc_DisplayIndented.h> +#include <parc/algol/parc_Memory.h> + +#include "parc_MyObject.h" + +// Detect a compile time if a buffer is large enough to hold a structure. +#define parcObject_DefineXXX(_type_, ...) \ + typedef struct { __VA_ARGS__ } _ ## _type_; \ + enum { bytesCompileTimeAssertion = 1 / !!(sizeof(_type_) >= sizeof(_ ## _type_)) } + +struct PARCMyObject { + int x; + double y; + double z; +}; + +static bool +_parcMyObject_Destructor(PARCMyObject **instancePtr) +{ + assertNotNull(instancePtr, "Parameter must be a non-null pointer to a PARCMyObject pointer."); + + + /* cleanup the instance fields here */ + return true; +} + +parcObject_ImplementAcquire(parcMyObject, PARCMyObject); + +parcObject_ImplementRelease(parcMyObject, PARCMyObject); + +parcObject_Override( + PARCMyObject, PARCObject, + .destructor = (PARCObjectDestructor *) _parcMyObject_Destructor, + .copy = (PARCObjectCopy *) parcMyObject_Copy, + .toString = (PARCObjectToString *) parcMyObject_ToString, + .equals = (PARCObjectEquals *) parcMyObject_Equals, + .compare = (PARCObjectCompare *) parcMyObject_Compare, + .hashCode = (PARCObjectHashCode *) parcMyObject_HashCode, + .toJSON = (PARCObjectToJSON *) parcMyObject_ToJSON); + + +void +parcMyObject_AssertValid(const PARCMyObject *instance) +{ + assertTrue(parcMyObject_IsValid(instance), + "PARCMyObject is not valid."); +} + +PARCMyObject * +parcMyObject_Wrap(void *origin) +{ + PARCMyObject *result = parcObject_Wrap(origin, PARCMyObject); + + return result; +} + +PARCMyObject * +parcMyObject_Init(PARCMyObject *object, int x, double y, double z) +{ + if (object != NULL) { + object->x = x; + object->y = y; + object->z = z; + } + + return object; +} + +PARCMyObject * +parcMyObject_Create(int x, double y, double z) +{ + PARCMyObject *result = parcObject_CreateInstance(PARCMyObject); + + if (result != NULL) { + result->x = x; + result->y = y; + result->z = z; + } + + return (PARCMyObject *) result; +} + +int +parcMyObject_Compare(const PARCMyObject *instance, const PARCMyObject *other) +{ + int result = 0; + + return result; +} + +PARCMyObject * +parcMyObject_Copy(const PARCMyObject *original) +{ + PARCMyObject *result = NULL; + + return result; +} + +void +parcMyObject_Display(const PARCMyObject *object, int indentation) +{ + parcDisplayIndented_PrintLine(indentation, "PARCMyObject@%p { .x=%d .y=%f .z=%f }", object, object->x, object->y, object->z); +} + +bool +parcMyObject_Equals(const PARCMyObject *x, const PARCMyObject *y) +{ + bool result = false; + + if (x == y) { + result = true; + } else if (x == NULL || y == NULL) { + result = false; + } else { + /* perform instance specific equality tests here. */ + } + + return result; +} + +PARCHashCode +parcMyObject_HashCode(const PARCMyObject *instance) +{ + PARCHashCode result = 0; + + return result; +} + +bool +parcMyObject_IsValid(const PARCMyObject *instance) +{ + bool result = false; + + if (instance != NULL) { + result = true; + } + + return result; +} + +PARCJSON * +parcMyObject_ToJSON(const PARCMyObject *instance) +{ + PARCJSON *result = parcJSON_Create(); + + if (result != NULL) { + } + + return result; +} + +char * +parcMyObject_ToString(const PARCMyObject *object) +{ + char *result = parcMemory_Format("PARCMyObject@%p { .x=%d .y=%f .z=%f }", object, object->x, object->y, object->z); + + return result; +} diff --git a/libparc/examples/How To Create A Static PARC Object/parc_MyObject.h b/libparc/examples/How To Create A Static PARC Object/parc_MyObject.h new file mode 100644 index 00000000..124e734e --- /dev/null +++ b/libparc/examples/How To Create A Static PARC Object/parc_MyObject.h @@ -0,0 +1,368 @@ +/* + * 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. + */ + +/** + * @file parc_MyObject.h + * @brief A simple example of how to create static, not allocataed, PARC Objects. + * + */ +#ifndef PARCLibrary_parc_MyObject +#define PARCLibrary_parc_MyObject +#include <stdbool.h> + +#include <parc/algol/parc_JSON.h> +#include <parc/algol/parc_HashCode.h> + +parcObject_Declare(PARCMyObject); + +/** + * The number of bytes sufficient to contain the MyObject data. + * + * This is dependant upon the definition of the underlying `struct MyObject`. + * If that definition changes, it may be necessary to change this constant. + */ +#define PARCMyObjectSizeOf 24 + +/** + * Increase the number of references to a `PARCMyObject` instance. + * + * Note that new `PARCMyObject` is not created, + * only that the given `PARCMyObject` reference count is incremented. + * Discard the reference by invoking `parcMyObject_Release`. + * + * @param [in] instance A pointer to a valid PARCMyObject instance. + * + * @return The same value as @p instance. + * + * Example: + * @code + * { + * PARCMyObject *a = parcMyObject_Create(); + * + * PARCMyObject *b = parcMyObject_Acquire(); + * + * parcMyObject_Release(&a); + * parcMyObject_Release(&b); + * } + * @endcode + */ +PARCMyObject *parcMyObject_Acquire(const PARCMyObject *instance); + +#ifdef PARCLibrary_DISABLE_VALIDATION +# define parcMyObject_OptionalAssertValid(_instance_) +#else +# define parcMyObject_OptionalAssertValid(_instance_) parcMyObject_AssertValid(_instance_) +#endif + +/** + * Assert that the given `PARCMyObject` instance is valid. + * + * @param [in] instance A pointer to a valid PARCMyObject instance. + * + * Example: + * @code + * { + * PARCMyObject *a = parcMyObject_Create(); + * + * parcMyObject_AssertValid(a); + * + * printf("Instance is valid.\n"); + * + * parcMyObject_Release(&b); + * } + * @endcode + */ +void parcMyObject_AssertValid(const PARCMyObject *instance); + +/** + * Create an instance of PARCMyObject + * + * @return non-NULL A pointer to a valid PARCMyObject instance. + * @return NULL An error occurred. + * + * Example: + * @code + * { + * PARCMyObject *a = parcMyObject_Create(); + * + * parcMyObject_Release(&a); + * } + * @endcode + */ +PARCMyObject *parcMyObject_Create(int x, double y, double z); + +/** + * Set a PARCMyObject instance to it's initial, created state. + * + * @return non-NULL A pointer to a valid PARCMyObject instance. + * @return NULL An error occurred. + */ +PARCMyObject *parcMyObject_Init(PARCMyObject *instance, int x, double y, double z); + +PARCMyObject *parcMyObject_Wrap(void *origin); + +/** + * Compares @p instance with @p other for order. + * + * Returns a negative integer, zero, or a positive integer as @p instance + * is less than, equal to, or greater than @p other. + * + * @param [in] instance A pointer to a valid PARCMyObject instance. + * @param [in] other A pointer to a valid PARCMyObject instance. + * + * @return <0 Instance is less than @p other. + * @return 0 Instance a and instance b compare the same. + * @return >0 Instance a is greater than instance b. + * + * Example: + * @code + * { + * PARCMyObject *a = parcMyObject_Create(); + * PARCMyObject *b = parcMyObject_Create(); + * + * if (parcMyObject_Compare(a, b) == 0) { + * printf("Instances are equal.\n"); + * } + * + * parcMyObject_Release(&a); + * parcMyObject_Release(&b); + * } + * @endcode + * + * @see parcMyObject_Equals + */ +int parcMyObject_Compare(const PARCMyObject *instance, const PARCMyObject *other); + +/** + * Create an independent copy the given `PARCBuffer` + * + * A new buffer is created as a complete copy of the original. + * + * @param [in] original A pointer to a valid PARCMyObject instance. + * + * @return NULL Memory could not be allocated. + * @return non-NULL A pointer to a new `PARCMyObject` instance. + * + * Example: + * @code + * { + * PARCMyObject *a = parcMyObject_Create(); + * + * PARCMyObject *copy = parcMyObject_Copy(&b); + * + * parcMyObject_Release(&b); + * parcMyObject_Release(©); + * } + * @endcode + */ +PARCMyObject *parcMyObject_Copy(const PARCMyObject *original); + +/** + * Print a human readable representation of the given `PARCMyObject`. + * + * @param [in] instance A pointer to a valid PARCMyObject instance. + * @param [in] indentation The indentation level to use for printing. + * + * Example: + * @code + * { + * PARCMyObject *a = parcMyObject_Create(); + * + * parcMyObject_Display(a, 0); + * + * parcMyObject_Release(&a); + * } + * @endcode + */ +void parcMyObject_Display(const PARCMyObject *instance, int indentation); + +/** + * Determine if two `PARCMyObject` instances are equal. + * + * The following equivalence relations on non-null `PARCMyObject` instances are maintained: * + * * It is reflexive: for any non-null reference value x, `parcMyObject_Equals(x, x)` must return true. + * + * * It is symmetric: for any non-null reference values x and y, `parcMyObject_Equals(x, y)` must return true if and only if + * `parcMyObject_Equals(y x)` returns true. + * + * * It is transitive: for any non-null reference values x, y, and z, if + * `parcMyObject_Equals(x, y)` returns true and + * `parcMyObject_Equals(y, z)` returns true, + * then `parcMyObject_Equals(x, z)` must return true. + * + * * It is consistent: for any non-null reference values x and y, multiple invocations of `parcMyObject_Equals(x, y)` + * consistently return true or consistently return false. + * + * * For any non-null reference value x, `parcMyObject_Equals(x, NULL)` must return false. + * + * @param [in] x A pointer to a valid PARCMyObject instance. + * @param [in] y A pointer to a valid PARCMyObject instance. + * + * @return true The instances x and y are equal. + * + * Example: + * @code + * { + * PARCMyObject *a = parcMyObject_Create(); + * PARCMyObject *b = parcMyObject_Create(); + * + * if (parcMyObject_Equals(a, b)) { + * printf("Instances are equal.\n"); + * } + * + * parcMyObject_Release(&a); + * parcMyObject_Release(&b); + * } + * @endcode + * @see parcMyObject_HashCode + */ +bool parcMyObject_Equals(const PARCMyObject *x, const PARCMyObject *y); + +/** + * Returns a hash code value for the given instance. + * + * The general contract of `HashCode` is: + * + * Whenever it is invoked on the same instance more than once during an execution of an application, + * the `HashCode` function must consistently return the same value, + * provided no information used in a corresponding comparisons on the instance is modified. + * + * This value need not remain consistent from one execution of an application to another execution of the same application. + * If two instances are equal according to the {@link parcMyObject_Equals} method, + * then calling the {@link parcMyObject_HashCode} method on each of the two instances must produce the same integer result. + * + * It is not required that if two instances are unequal according to the + * {@link parcMyObject_Equals} function, + * then calling the `parcMyObject_HashCode` + * method on each of the two objects must produce distinct integer results. + * + * @param [in] instance A pointer to a valid PARCMyObject instance. + * + * @return The hashcode for the given instance. + * + * Example: + * @code + * { + * PARCMyObject *a = parcMyObject_Create(); + * + * PARCHashCode hashValue = parcMyObject_HashCode(buffer); + * parcMyObject_Release(&a); + * } + * @endcode + */ +PARCHashCode parcMyObject_HashCode(const PARCMyObject *instance); + +/** + * Determine if an instance of `PARCMyObject` is valid. + * + * Valid means the internal state of the type is consistent with its required current or future behaviour. + * This may include the validation of internal instances of types. + * + * @param [in] instance A pointer to a valid PARCMyObject instance. + * + * @return true The instance is valid. + * @return false The instance is not valid. + * + * Example: + * @code + * { + * PARCMyObject *a = parcMyObject_Create(); + * + * if (parcMyObject_IsValid(a)) { + * printf("Instance is valid.\n"); + * } + * + * parcMyObject_Release(&a); + * } + * @endcode + * + */ +bool parcMyObject_IsValid(const PARCMyObject *instance); + +/** + * Release a previously acquired reference to the given `PARCMyObject` instance, + * decrementing the reference count for the instance. + * + * The pointer to the instance is set to NULL as a side-effect of this function. + * + * If the invocation causes the last reference to the instance to be released, + * the instance is deallocated and the instance's implementation will perform + * additional cleanup and release other privately held references. + * + * @param [in,out] instancePtr A pointer to a pointer to the instance to release. + * + * Example: + * @code + * { + * PARCMyObject *a = parcMyObject_Create(); + * + * parcMyObject_Release(&a); + * } + * @endcode + */ +void parcMyObject_Release(PARCMyObject **instancePtr); + +/** + * Create a `PARCJSON` instance (representation) of the given object. + * + * @param [in] instance A pointer to a valid PARCMyObject instance. + * + * @return NULL Memory could not be allocated to contain the `PARCJSON` instance. + * @return non-NULL An allocated C string that must be deallocated via parcMemory_Deallocate(). + * + * Example: + * @code + * { + * PARCMyObject *a = parcMyObject_Create(); + * + * PARCJSON *json = parcMyObject_ToJSON(a); + * + * printf("JSON representation: %s\n", parcJSON_ToString(json)); + * parcJSON_Release(&json); + * + * parcMyObject_Release(&a); + * } + * @endcode + */ +PARCJSON *parcMyObject_ToJSON(const PARCMyObject *instance); + +/** + * Produce a null-terminated string representation of the specified `PARCMyObject`. + * + * The result must be freed by the caller via {@link parcMemory_Deallocate}. + * + * @param [in] instance A pointer to a valid PARCMyObject instance. + * + * @return NULL Cannot allocate memory. + * @return non-NULL A pointer to an allocated, null-terminated C string that must be deallocated via {@link parcMemory_Deallocate}. + * + * Example: + * @code + * { + * PARCMyObject *a = parcMyObject_Create(); + * + * char *string = parcMyObject_ToString(a); + * + * parcMyObject_Release(&a); + * + * parcMemory_Deallocate(&string); + * } + * @endcode + * + * @see parcMyObject_Display + */ +char *parcMyObject_ToString(const PARCMyObject *instance); + +#endif diff --git a/libparc/examples/How To Create an Object Pool/main.c b/libparc/examples/How To Create an Object Pool/main.c new file mode 100644 index 00000000..710d3d7c --- /dev/null +++ b/libparc/examples/How To Create an Object Pool/main.c @@ -0,0 +1,35 @@ +/* + * 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 <stdlib.h> + +#include "parc_SimpleBufferPool.h" + +int +main(int argc, char *argv[argc]) +{ + PARCSimpleBufferPool *pool = parcSimpleBufferPool_Create(3, 10); + + PARCBuffer *buffer = parcSimpleBufferPool_GetInstance(pool); + parcBuffer_Release(&buffer); + + buffer = parcSimpleBufferPool_GetInstance(pool); + parcBuffer_Release(&buffer); + + parcSimpleBufferPool_Release(&pool); + + return 0; +} 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 new file mode 100644 index 00000000..fbd71b6e --- /dev/null +++ b/libparc/examples/How To Create an Object Pool/parc_SimpleBufferPool.c @@ -0,0 +1,107 @@ +/* + * 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; +} diff --git a/libparc/examples/How To Create an Object Pool/parc_SimpleBufferPool.h b/libparc/examples/How To Create an Object Pool/parc_SimpleBufferPool.h new file mode 100644 index 00000000..fe8ddf4a --- /dev/null +++ b/libparc/examples/How To Create an Object Pool/parc_SimpleBufferPool.h @@ -0,0 +1,100 @@ +/* + * 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. + */ + +/** + * @file parc_BufferPool.h + * @brief <#Brief Description#> + * + * <#Detailed Description#> + * + */ +#ifndef PARCLibrary_parc_BufferPool +#define PARCLibrary_parc_BufferPool +#include <stdbool.h> + +#include <parc/algol/parc_Object.h> + +parcObject_Declare(PARCSimpleBufferPool); + +/** + * Increase the number of references to a `PARCBufferPool` instance. + * + * Note that new `PARCBufferPool` is not created, + * only that the given `PARCBufferPool` reference count is incremented. + * Discard the reference by invoking `parcSimpleBufferPool_Release`. + * + * @param [in] instance A pointer to a valid PARCBufferPool instance. + * + * @return The same value as @p instance. + * + * Example: + * @code + * { + * PARCBufferPool *a = parcSimpleBufferPool_Create(); + * + * PARCBufferPool *b = parcSimpleBufferPool_Acquire(); + * + * parcSimpleBufferPool_Release(&a); + * parcSimpleBufferPool_Release(&b); + * } + * @endcode + */ +PARCSimpleBufferPool *parcSimpleBufferPool_Acquire(const PARCSimpleBufferPool *instance); + +/** + * Create an instance of PARCBufferPool + * + * <#Paragraphs Of Explanation#> + * + * @return non-NULL A pointer to a valid PARCBufferPool instance. + * @return NULL An error occurred. + * + * Example: + * @code + * { + * PARCBufferPool *a = parcSimpleBufferPool_Create(); + * + * parcSimpleBufferPool_Release(&a); + * } + * @endcode + */ +PARCSimpleBufferPool *parcSimpleBufferPool_Create(size_t highWater, size_t bufferSize); + +/** + * Release a previously acquired reference to the given `PARCBufferPool` instance, + * decrementing the reference count for the instance. + * + * The pointer to the instance is set to NULL as a side-effect of this function. + * + * If the invocation causes the last reference to the instance to be released, + * the instance is deallocated and the instance's implementation will perform + * additional cleanup and release other privately held references. + * + * @param [in,out] instancePtr A pointer to a pointer to the instance to release. + * + * Example: + * @code + * { + * PARCSimpleBufferPool *a = parcSimpleBufferPool_Create(); + * + * parcSimpleBufferPool_Release(&a); + * } + * @endcode + */ +void parcSimpleBufferPool_Release(PARCSimpleBufferPool **instancePtr); + +PARCBuffer *parcSimpleBufferPool_GetInstance(PARCSimpleBufferPool *bufferPool); + +#endif diff --git a/libparc/examples/How To Extend a PARCObject/HowToExtendAPARCObject.c b/libparc/examples/How To Extend a PARCObject/HowToExtendAPARCObject.c new file mode 100644 index 00000000..e98018d7 --- /dev/null +++ b/libparc/examples/How To Extend a PARCObject/HowToExtendAPARCObject.c @@ -0,0 +1,102 @@ +/* + * 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. + */ + +/** + * + * This example shows a simple extention of an existing PARC Object implementation + * (PARCString) to replace the default implementation of the Compare() function with another. + * + * The demonstration shows how to reverse the sort order of a PARCSortedList + * containing a list of PARCString instances without changing PARCSortedList nor PARCString. + * + */ +#include <stdio.h> + +#include <parc/algol/parc_SortedList.h> +#include <parc/algol/parc_String.h> + +/* + * This is the default behaviour of the PARCSortedList implementation. + */ +void +forwardOrder(void) +{ + PARCSortedList *sortedList = parcSortedList_Create(); + + PARCString *aaa = parcString_Create("aaa"); + PARCString *aab = parcString_Create("aab"); + PARCString *aac = parcString_Create("aac"); + + parcSortedList_Add(sortedList, aaa); + parcSortedList_Add(sortedList, aab); + parcSortedList_Add(sortedList, aac); + + parcSortedList_Display(sortedList, 0); + parcString_Release(&aaa); + parcString_Release(&aab); + parcString_Release(&aac); +} + +/* + * This function will be substituted for the default Compare implementation in the PARCString object. + */ +int +parcString_ReverseCompare(const PARCString *string, const PARCString *other) +{ + return parcString_Compare(string, other) * -1; +} + +parcObject_Extends(PARCReverseString, PARCString, + .compare = (PARCObjectCompare *) parcString_ReverseCompare); + + +PARCString * +parcMyString_Create(const char *string) +{ + PARCString *result = parcString_Create(string); + + // By setting the descriptor to our special descriptor here, we effectively + // substitute the default compare function with our parcString_ReverseCompare + parcObject_SetDescriptor(result, &parcObject_DescriptorName(PARCReverseString)); + + return result; +} + +void +reverseOrder(void) +{ + PARCSortedList *sortedList = parcSortedList_Create(); + + PARCString *aaa = parcMyString_Create("aaa"); + PARCString *aab = parcMyString_Create("aab"); + PARCString *aac = parcMyString_Create("aac"); + + parcSortedList_Add(sortedList, aaa); + parcSortedList_Add(sortedList, aab); + parcSortedList_Add(sortedList, aac); + + parcSortedList_Display(sortedList, 0); + parcString_Release(&aaa); + parcString_Release(&aab); + parcString_Release(&aac); +} + +int +main(int argc, const char *argv[argc]) +{ + forwardOrder(); + reverseOrder(); + return 0; +} |