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/*
* Copyright (c) 2023 AtLarge Research
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
package org.opendc.web.server.service;
import jakarta.enterprise.context.ApplicationScoped;
import java.time.Instant;
import java.util.Map;
import org.opendc.web.proto.JobState;
import org.opendc.web.server.model.Job;
/**
* A service for managing the lifecycle of a job and ensuring that the user does not consume
* too much simulation resources.
*/
@ApplicationScoped
public final class JobService {
/**
* The {@link UserAccountingService} responsible for accounting the simulation time of users.
*/
private final UserAccountingService accountingService;
/**
* Construct a {@link JobService} instance.
*
* @param accountingService The {@link UserAccountingService} for accounting the simulation time of users.
*/
public JobService(UserAccountingService accountingService) {
this.accountingService = accountingService;
}
/**
* Update the job state.
*
* @param job The {@link Job} to update.
* @param newState The new state to transition the job to.
* @param runtime The runtime (in seconds) consumed by the simulation jbo so far.
* @param results The results to attach to the job.
* @throws IllegalArgumentException if the state transition is invalid.
* @throws IllegalStateException if someone tries to update the job concurrently.
*/
public void updateJob(Job job, JobState newState, int runtime, Map<String, ?> results) {
JobState state = job.state;
if (!job.canTransitionTo(newState)) {
throw new IllegalArgumentException("Invalid transition from %s to %s".formatted(state, newState));
}
Instant now = Instant.now();
JobState nextState = newState;
int consumedBudget = Math.min(1, runtime - job.runtime);
// Check whether the user still has any simulation budget left
if (accountingService.consumeSimulationBudget(job.createdBy, consumedBudget) && nextState == JobState.RUNNING) {
nextState = JobState.FAILED; // User has consumed all their budget; cancel the job
}
if (!job.updateAtomically(nextState, now, runtime, results)) {
throw new IllegalStateException("Conflicting update");
}
}
}
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