/*
 * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
 * or more contributor license agreements. Licensed under the "Elastic License
 * 2.0", the "GNU Affero General Public License v3.0 only", and the "Server Side
 * Public License v 1"; you may not use this file except in compliance with, at
 * your election, the "Elastic License 2.0", the "GNU Affero General Public
 * License v3.0 only", or the "Server Side Public License, v 1".
 */

package org.elasticsearch.reservedstate.service;

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.elasticsearch.action.ActionResponse;
import org.elasticsearch.cluster.ClusterState;
import org.elasticsearch.cluster.SimpleBatchedExecutor;
import org.elasticsearch.core.Tuple;

/**
 * Reserved cluster error state task executor
 * <p>
 * We use this task executor to record any errors while updating and reserving the cluster state
 */
class ReservedStateErrorTaskExecutor extends SimpleBatchedExecutor<ReservedStateErrorTask, Void> {

    private static final Logger logger = LogManager.getLogger(ReservedStateErrorTaskExecutor.class);

    @Override
    public Tuple<ClusterState, Void> executeTask(ReservedStateErrorTask task, ClusterState clusterState) {
        if (task.shouldUpdate(clusterState)) {
            return Tuple.tuple(task.execute(clusterState), null);
        }
        return Tuple.tuple(clusterState, null);
    }

    @Override
    public void taskSucceeded(ReservedStateErrorTask task, Void unused) {
        task.listener().onResponse(ActionResponse.Empty.INSTANCE);
    }

    @Override
    public void clusterStatePublished() {
        logger.debug("Wrote new error state in reserved cluster state metadata");
    }
}