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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 <config.h>
#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_Execution.h>
#include <parc/concurrent/parc_FutureTask.h>
struct PARCFutureTask {
void *(*function)(PARCFutureTask *task, void *parameter);
void *parameter;
void *result;
bool isRunning;
bool isDone;
bool isCancelled;
};
static void
_parcFutureTask_Initialise(PARCFutureTask *futureTask)
{
futureTask->result = NULL;
futureTask->isDone = false;
futureTask->isCancelled = false;
futureTask->isRunning = false;
}
static bool
_parcFutureTask_Destructor(PARCFutureTask **instancePtr)
{
parcAssertNotNull(instancePtr, "Parameter must be a non-null pointer to a PARCFutureTask pointer.");
PARCFutureTask *task = *instancePtr;
if (parcObject_IsInstanceOf(task->parameter, &PARCObject_Descriptor)) {
parcObject_Release(&task->parameter);
}
return true;
}
parcObject_ImplementAcquire(parcFutureTask, PARCFutureTask);
parcObject_ImplementRelease(parcFutureTask, PARCFutureTask);
parcObject_Override(PARCFutureTask, PARCObject,
.isLockable = true,
.destructor = (PARCObjectDestructor *) _parcFutureTask_Destructor,
.copy = (PARCObjectCopy *) parcFutureTask_Copy,
.toString = (PARCObjectToString *) parcFutureTask_ToString,
.equals = (PARCObjectEquals *) parcFutureTask_Equals,
.compare = (PARCObjectCompare *) parcFutureTask_Compare,
.hashCode = (PARCObjectHashCode *) parcFutureTask_HashCode,
.display = (PARCObjectDisplay *) parcFutureTask_Display);
void
parcFutureTask_AssertValid(const PARCFutureTask *task)
{
parcAssertTrue(parcFutureTask_IsValid(task),
"PARCFutureTask is not valid.");
}
PARCFutureTask *
parcFutureTask_Create(void *(*function)(PARCFutureTask *task, void *parameter), void *parameter)
{
PARCFutureTask *result = parcObject_CreateInstance(PARCFutureTask);
if (parcObject_IsInstanceOf(parameter, &PARCObject_Descriptor)) {
parameter = parcObject_Acquire(parameter);
}
if (result != NULL) {
result->function = function;
result->parameter = parameter;
_parcFutureTask_Initialise(result);
}
return result;
}
int
parcFutureTask_Compare(const PARCFutureTask *instance, const PARCFutureTask *other)
{
int result = 0;
return result;
}
PARCFutureTask *
parcFutureTask_Copy(const PARCFutureTask *original)
{
PARCFutureTask *result = parcFutureTask_Create(original->function, original->parameter);
return result;
}
void
parcFutureTask_Display(const PARCFutureTask *instance, int indentation)
{
parcDisplayIndented_PrintLine(indentation, "PARCFutureTask@%p {", instance);
/* Call Display() functions for the fields here. */
parcDisplayIndented_PrintLine(indentation, "}");
}
bool
parcFutureTask_Equals(const PARCFutureTask *x, const PARCFutureTask *y)
{
bool result = false;
if (x == y) {
result = true;
} else if (x == NULL || y == NULL) {
result = false;
} else {
if (x->function == y->function) {
if (x->parameter == y->parameter) {
result = true;
}
}
}
return result;
}
PARCHashCode
parcFutureTask_HashCode(const PARCFutureTask *instance)
{
PARCHashCode result = 0;
return result;
}
bool
parcFutureTask_IsValid(const PARCFutureTask *instance)
{
bool result = false;
if (instance != NULL) {
result = true;
}
return result;
}
PARCJSON *
parcFutureTask_ToJSON(const PARCFutureTask *instance)
{
PARCJSON *result = parcJSON_Create();
if (result != NULL) {
}
return result;
}
char *
parcFutureTask_ToString(const PARCFutureTask *instance)
{
char *result = parcMemory_Format("PARCFutureTask@%p\n", instance);
return result;
}
bool
parcFutureTask_Cancel(PARCFutureTask *task, bool mayInterruptIfRunning)
{
bool result = false;
if (parcObject_Lock(task)) {
if (task->isRunning) {
if (mayInterruptIfRunning) {
printf("Interrupting a running task is not implemented yet.\n");
}
result = false;
} else {
task->isCancelled = true;
task->isDone = true;
parcObject_Notify(task);
result = true;
}
parcObject_Unlock(task);
}
return result;
}
PARCFutureTaskResult
parcFutureTask_Get(const PARCFutureTask *futureTask, const PARCTimeout *timeout)
{
PARCFutureTaskResult result;
result.execution = PARCExecution_Timeout;
result.value = 0;
if (parcTimeout_IsImmediate(timeout)) {
if (futureTask->isDone) {
result.execution = PARCExecution_OK;
result.value = futureTask->result;
}
} else {
result.execution = PARCExecution_Interrupted;
result.value = 0;
parcObject_Lock(futureTask);
while (!futureTask->isDone) {
if (parcTimeout_IsNever(timeout)) {
parcObject_Wait(futureTask);
result.execution = PARCExecution_OK;
result.value = futureTask->result;
break;
} else {
if (parcObject_WaitFor(futureTask, parcTimeout_InNanoSeconds(timeout))) {
result.execution = PARCExecution_OK;
result.value = futureTask->result;
break;
}
}
}
parcObject_Unlock(futureTask);
}
return result;
}
bool
parcFutureTask_IsCancelled(const PARCFutureTask *task)
{
return task->isCancelled;
}
bool
parcFutureTask_IsDone(const PARCFutureTask *task)
{
return task->isDone;
}
static void *
_parcFutureTask_Execute(PARCFutureTask *task)
{
task->isRunning = true;
void *result = task->function(task, task->parameter);
task->isRunning = false;
return result;
}
void *
parcFutureTask_Run(PARCFutureTask *task)
{
if (parcFutureTask_Lock(task)) {
if (!task->isCancelled) {
task->result = _parcFutureTask_Execute(task);
task->isDone = true;
parcFutureTask_Notify(task);
}
parcFutureTask_Unlock(task);
} else {
parcTrapCannotObtainLock("Cannot lock PARCFutureTask");
}
return task->result;
}
bool
parcFutureTask_RunAndReset(PARCFutureTask *task)
{
bool result = false;
if (parcObject_Lock(task)) {
if (!task->isCancelled) {
_parcFutureTask_Execute(task);
parcFutureTask_Reset(task);
result = true;
}
parcFutureTask_Unlock(task);
} else {
parcTrapCannotObtainLock("Cannot lock PARCFutureTask");
}
return result;
}
void
parcFutureTask_Reset(PARCFutureTask *task)
{
_parcFutureTask_Initialise(task);
}
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