resource_discrete: Create a discrete resource

In WARDEN: Workflows for Health Technology Assessments in R using Discrete EveNts

Create a discrete resource

Description

Creates a discrete resource management system for discrete event simulations. This system manages a fixed number of identical resource units that can be blocked (used) by patients and maintains a priority queue for waiting patients.

Usage

resource_discrete(n)

Arguments

n	Integer. The total capacity of the resource (must be >= 1).

Details

The returned environment has the following methods:

• size(): Returns the total capacity

• queue_size(): Returns the number of patients in queue

• n_free(): Returns the number of free resource units

• patients_using(): Vector of patient IDs currently using the resource

• patients_using_times(): Vector of start times for patients using the resource

• queue_start_times(): Vector of queue start times parallel to queue order

• queue_priorities(): Vector of priorities parallel to queue order

• queue_info(n): Data.frame with patient_id, priority, start_time for queue

• is_patient_in_queue(patient_id): Check if patient is in queue

• is_patient_using(patient_id): Check if patient is using resource

• attempt_block(patient_id, priority, start_time): Attempt to block a resource unit

• attempt_free(patient_id, remove_all): Free a resource unit

• attempt_free_if_using(patient_id, remove_all): Free only if patient is using

• next_patient_in_line(n): Get next n patients in queue

• modify_priority(patient_id, new_priority): Modify patient priority in queue

• add_resource(n): Add n resource units to total capacity

• remove_resource(n, current_time): Remove n resource units from total capacity

Value

An environment with methods for resource management.

Examples

# Create a resource with 3 units
beds <- resource_discrete(3)

# Check initial state
beds$size()      # 3
beds$n_free()    # 3
beds$queue_size() # 0

# Block resources
i <- 101; curtime <- 0.0
beds$attempt_block()  # Uses i and curtime from environment

# Or explicitly
beds$attempt_block(patient_id = 102, priority = 1, start_time = 1.0)

# Check patient status
beds$is_patient_using(101)     # TRUE
beds$is_patient_in_queue(102)  # FALSE

WARDEN documentation built on Nov. 5, 2025, 7:45 p.m.