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Diffstat (limited to 'libparc/parc/concurrent/parc_ScheduledThreadPool.h')
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1 files changed, 429 insertions, 0 deletions
diff --git a/libparc/parc/concurrent/parc_ScheduledThreadPool.h b/libparc/parc/concurrent/parc_ScheduledThreadPool.h new file mode 100755 index 00000000..36c26909 --- /dev/null +++ b/libparc/parc/concurrent/parc_ScheduledThreadPool.h @@ -0,0 +1,429 @@ +/* + * 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_ScheduledThreadPool.h + * @ingroup threading + * @brief <#Brief Description#> + * + * <#Detailed Description#> + * + */ +#ifndef PARCLibrary_parc_ScheduledThreadPool +#define PARCLibrary_parc_ScheduledThreadPool +#include <stdbool.h> + +#include <parc/algol/parc_JSON.h> +#include <parc/algol/parc_HashCode.h> +#include <parc/algol/parc_SortedList.h> +#include <parc/concurrent/parc_FutureTask.h> +#include <parc/concurrent/parc_ScheduledTask.h> +#include <parc/concurrent/parc_Timeout.h> + +struct PARCScheduledThreadPool; +typedef struct PARCScheduledThreadPool PARCScheduledThreadPool; + +/** + * Increase the number of references to a `PARCScheduledThreadPool` instance. + * + * Note that new `PARCScheduledThreadPool` is not created, + * only that the given `PARCScheduledThreadPool` reference count is incremented. + * Discard the reference by invoking `parcScheduledThreadPool_Release`. + * + * @param [in] instance A pointer to a valid PARCScheduledThreadPool instance. + * + * @return The same value as @p instance. + * + * Example: + * @code + * { + * PARCScheduledThreadPool *a = parcScheduledThreadPool_Create(); + * + * PARCScheduledThreadPool *b = parcScheduledThreadPool_Acquire(); + * + * parcScheduledThreadPool_Release(&a); + * parcScheduledThreadPool_Release(&b); + * } + * @endcode + */ +PARCScheduledThreadPool *parcScheduledThreadPool_Acquire(const PARCScheduledThreadPool *instance); + +#ifdef PARCLibrary_DISABLE_VALIDATION +# define parcScheduledThreadPool_OptionalAssertValid(_instance_) +#else +# define parcScheduledThreadPool_OptionalAssertValid(_instance_) parcScheduledThreadPool_AssertValid(_instance_) +#endif + +/** + * Assert that the given `PARCScheduledThreadPool` instance is valid. + * + * @param [in] instance A pointer to a valid PARCScheduledThreadPool instance. + * + * Example: + * @code + * { + * PARCScheduledThreadPool *a = parcScheduledThreadPool_Create(); + * + * parcScheduledThreadPool_AssertValid(a); + * + * printf("Instance is valid.\n"); + * + * parcScheduledThreadPool_Release(&b); + * } + * @endcode + */ +void parcScheduledThreadPool_AssertValid(const PARCScheduledThreadPool *instance); + +/** + * Create an instance of PARCScheduledThreadPool + * + * <#Paragraphs Of Explanation#> + * + * @return non-NULL A pointer to a valid PARCScheduledThreadPool instance. + * @return NULL An error occurred. + * + * Example: + * @code + * { + * PARCScheduledThreadPool *a = parcScheduledThreadPool_Create(); + * + * parcScheduledThreadPool_Release(&a); + * } + * @endcode + */ +PARCScheduledThreadPool *parcScheduledThreadPool_Create(int poolSize); + +/** + * 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 PARCScheduledThreadPool instance. + * @param [in] other A pointer to a valid PARCScheduledThreadPool 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 + * { + * PARCScheduledThreadPool *a = parcScheduledThreadPool_Create(); + * PARCScheduledThreadPool *b = parcScheduledThreadPool_Create(); + * + * if (parcScheduledThreadPool_Compare(a, b) == 0) { + * printf("Instances are equal.\n"); + * } + * + * parcScheduledThreadPool_Release(&a); + * parcScheduledThreadPool_Release(&b); + * } + * @endcode + * + * @see parcScheduledThreadPool_Equals + */ +int parcScheduledThreadPool_Compare(const PARCScheduledThreadPool *instance, const PARCScheduledThreadPool *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 PARCScheduledThreadPool instance. + * + * @return NULL Memory could not be allocated. + * @return non-NULL A pointer to a new `PARCScheduledThreadPool` instance. + * + * Example: + * @code + * { + * PARCScheduledThreadPool *a = parcScheduledThreadPool_Create(); + * + * PARCScheduledThreadPool *copy = parcScheduledThreadPool_Copy(&b); + * + * parcScheduledThreadPool_Release(&b); + * parcScheduledThreadPool_Release(©); + * } + * @endcode + */ +PARCScheduledThreadPool *parcScheduledThreadPool_Copy(const PARCScheduledThreadPool *original); + +/** + * Print a human readable representation of the given `PARCScheduledThreadPool`. + * + * @param [in] instance A pointer to a valid PARCScheduledThreadPool instance. + * @param [in] indentation The indentation level to use for printing. + * + * Example: + * @code + * { + * PARCScheduledThreadPool *a = parcScheduledThreadPool_Create(); + * + * parcScheduledThreadPool_Display(a, 0); + * + * parcScheduledThreadPool_Release(&a); + * } + * @endcode + */ +void parcScheduledThreadPool_Display(const PARCScheduledThreadPool *instance, int indentation); + +/** + * Determine if two `PARCScheduledThreadPool` instances are equal. + * + * The following equivalence relations on non-null `PARCScheduledThreadPool` instances are maintained: * + * * It is reflexive: for any non-null reference value x, `parcScheduledThreadPool_Equals(x, x)` must return true. + * + * * It is symmetric: for any non-null reference values x and y, `parcScheduledThreadPool_Equals(x, y)` must return true if and only if + * `parcScheduledThreadPool_Equals(y x)` returns true. + * + * * It is transitive: for any non-null reference values x, y, and z, if + * `parcScheduledThreadPool_Equals(x, y)` returns true and + * `parcScheduledThreadPool_Equals(y, z)` returns true, + * then `parcScheduledThreadPool_Equals(x, z)` must return true. + * + * * It is consistent: for any non-null reference values x and y, multiple invocations of `parcScheduledThreadPool_Equals(x, y)` + * consistently return true or consistently return false. + * + * * For any non-null reference value x, `parcScheduledThreadPool_Equals(x, NULL)` must return false. + * + * @param [in] x A pointer to a valid PARCScheduledThreadPool instance. + * @param [in] y A pointer to a valid PARCScheduledThreadPool instance. + * + * @return true The instances x and y are equal. + * + * Example: + * @code + * { + * PARCScheduledThreadPool *a = parcScheduledThreadPool_Create(); + * PARCScheduledThreadPool *b = parcScheduledThreadPool_Create(); + * + * if (parcScheduledThreadPool_Equals(a, b)) { + * printf("Instances are equal.\n"); + * } + * + * parcScheduledThreadPool_Release(&a); + * parcScheduledThreadPool_Release(&b); + * } + * @endcode + * @see parcScheduledThreadPool_HashCode + */ +bool parcScheduledThreadPool_Equals(const PARCScheduledThreadPool *x, const PARCScheduledThreadPool *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 parcScheduledThreadPool_Equals} method, + * then calling the {@link parcScheduledThreadPool_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 parcScheduledThreadPool_Equals} function, + * then calling the `parcScheduledThreadPool_HashCode` + * method on each of the two objects must produce distinct integer results. + * + * @param [in] instance A pointer to a valid PARCScheduledThreadPool instance. + * + * @return The hashcode for the given instance. + * + * Example: + * @code + * { + * PARCScheduledThreadPool *a = parcScheduledThreadPool_Create(); + * + * PARCHashCode hashValue = parcScheduledThreadPool_HashCode(buffer); + * parcScheduledThreadPool_Release(&a); + * } + * @endcode + */ +PARCHashCode parcScheduledThreadPool_HashCode(const PARCScheduledThreadPool *instance); + +/** + * Determine if an instance of `PARCScheduledThreadPool` 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 PARCScheduledThreadPool instance. + * + * @return true The instance is valid. + * @return false The instance is not valid. + * + * Example: + * @code + * { + * PARCScheduledThreadPool *a = parcScheduledThreadPool_Create(); + * + * if (parcScheduledThreadPool_IsValid(a)) { + * printf("Instance is valid.\n"); + * } + * + * parcScheduledThreadPool_Release(&a); + * } + * @endcode + * + */ +bool parcScheduledThreadPool_IsValid(const PARCScheduledThreadPool *instance); + +/** + * Release a previously acquired reference to the given `PARCScheduledThreadPool` 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 + * { + * PARCScheduledThreadPool *a = parcScheduledThreadPool_Create(); + * + * parcScheduledThreadPool_Release(&a); + * } + * @endcode + */ +void parcScheduledThreadPool_Release(PARCScheduledThreadPool **instancePtr); + +/** + * Create a `PARCJSON` instance (representation) of the given object. + * + * @param [in] instance A pointer to a valid PARCScheduledThreadPool 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 + * { + * PARCScheduledThreadPool *a = parcScheduledThreadPool_Create(); + * + * PARCJSON *json = parcScheduledThreadPool_ToJSON(a); + * + * printf("JSON representation: %s\n", parcJSON_ToString(json)); + * parcJSON_Release(&json); + * + * parcScheduledThreadPool_Release(&a); + * } + * @endcode + */ +PARCJSON *parcScheduledThreadPool_ToJSON(const PARCScheduledThreadPool *instance); + +/** + * Produce a null-terminated string representation of the specified `PARCScheduledThreadPool`. + * + * The result must be freed by the caller via {@link parcMemory_Deallocate}. + * + * @param [in] instance A pointer to a valid PARCScheduledThreadPool 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 + * { + * PARCScheduledThreadPool *a = parcScheduledThreadPool_Create(); + * + * char *string = parcScheduledThreadPool_ToString(a); + * + * parcScheduledThreadPool_Release(&a); + * + * parcMemory_Deallocate(&string); + * } + * @endcode + * + * @see parcScheduledThreadPool_Display + */ +char *parcScheduledThreadPool_ToString(const PARCScheduledThreadPool *instance); + +/** + * Executes command with zero required delay. + */ +void parcScheduledThreadPool_Execute(PARCScheduledThreadPool *pool, PARCFutureTask *command); + +/** + * Gets the policy on whether to continue executing existing periodic tasks even when this executor has been shutdown. + */ +bool parcScheduledThreadPool_GetContinueExistingPeriodicTasksAfterShutdownPolicy(PARCScheduledThreadPool *pool); + +/** + * Gets the policy on whether to execute existing delayed tasks even when this executor has been shutdown. + */ +bool parcScheduledThreadPool_GetExecuteExistingDelayedTasksAfterShutdownPolicy(PARCScheduledThreadPool *pool); + +/** + * Returns the task queue used by this executor. + */ +PARCSortedList *parcScheduledThreadPool_GetQueue(const PARCScheduledThreadPool *pool); + +/** + * Gets the policy on whether cancelled tasks should be immediately removed from the work queue at time of cancellation. + */ +bool parcScheduledThreadPool_GetRemoveOnCancelPolicy(const PARCScheduledThreadPool *pool); + +/** + * Creates and executes a one-shot action that becomes enabled after the given delay. + */ +PARCScheduledTask *parcScheduledThreadPool_Schedule(PARCScheduledThreadPool *pool, PARCFutureTask *task, const PARCTimeout *delay); + +/** + * Creates and executes a periodic action that becomes enabled first after the given initial delay, and subsequently with the given period; that is executions will commence after initialDelay then initialDelay+period, then initialDelay + 2 * period, and so on. + */ +PARCScheduledTask *parcScheduledThreadPool_ScheduleAtFixedRate(PARCScheduledThreadPool *pool, PARCFutureTask *task, PARCTimeout initialDelay, PARCTimeout period); + +/** + * Creates and executes a periodic action that becomes enabled first after the given initial delay, and subsequently with the given delay between the termination of one execution and the commencement of the next. + */ +PARCScheduledTask *parcScheduledThreadPool_ScheduleWithFixedDelay(PARCScheduledThreadPool *pool, PARCFutureTask *task, PARCTimeout initialDelay, PARCTimeout delay); + +/** + * Sets the policy on whether to continue executing existing periodic tasks even when this executor has been shutdown. + */ +void parcScheduledThreadPool_SetContinueExistingPeriodicTasksAfterShutdownPolicy(PARCScheduledThreadPool *pool, bool value); + +/** + * Sets the policy on whether to execute existing delayed tasks even when this executor has been shutdown. + */ +void parcScheduledThreadPool_SetExecuteExistingDelayedTasksAfterShutdownPolicy(PARCScheduledThreadPool *pool, bool value); + +/** + * Sets the policy on whether cancelled tasks should be immediately removed from the work queue at time of cancellation. + */ +void parcScheduledThreadPool_SetRemoveOnCancelPolicy(PARCScheduledThreadPool *pool, bool value); + +/** + * Initiates an orderly shutdown in which previously submitted tasks are executed, but no new tasks will be accepted. + */ +void parcScheduledThreadPool_Shutdown(PARCScheduledThreadPool *pool); + +/** + * Attempts to stop all actively executing tasks, halts the processing of waiting tasks, and returns a list of the tasks that were awaiting execution. + */ +PARCList *parcScheduledThreadPool_ShutdownNow(PARCScheduledThreadPool *pool); + +/** + * Submits a PARCFutureTask task for execution and returns the PARCFutureTask representing that task. + */ +PARCScheduledTask *parcScheduledThreadPool_Submit(PARCScheduledThreadPool *pool, PARCFutureTask *task); +#endif |