org.elasticsearch.action.admin.cluster.desirednodes.TransportGetDesiredNodesAction Maven / Gradle / Ivy

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Elasticsearch subproject :server

There is a newer version: 8.14.0

/*
 * 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 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 or the Server
 * Side Public License, v 1.
 */

package org.elasticsearch.action.admin.cluster.desirednodes;

import org.elasticsearch.ResourceNotFoundException;
import org.elasticsearch.action.ActionListener;
import org.elasticsearch.action.support.ActionFilters;
import org.elasticsearch.action.support.master.TransportMasterNodeReadAction;
import org.elasticsearch.cluster.ClusterState;
import org.elasticsearch.cluster.block.ClusterBlockException;
import org.elasticsearch.cluster.block.ClusterBlockLevel;
import org.elasticsearch.cluster.metadata.DesiredNodes;
import org.elasticsearch.cluster.metadata.IndexNameExpressionResolver;
import org.elasticsearch.cluster.service.ClusterService;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.tasks.Task;
import org.elasticsearch.threadpool.ThreadPool;
import org.elasticsearch.transport.TransportService;

public class TransportGetDesiredNodesAction extends TransportMasterNodeReadAction<
    GetDesiredNodesAction.Request,
    GetDesiredNodesAction.Response> {
    @Inject
    public TransportGetDesiredNodesAction(
        TransportService transportService,
        ClusterService clusterService,
        ThreadPool threadPool,
        ActionFilters actionFilters,
        IndexNameExpressionResolver indexNameExpressionResolver
    ) {
        super(
            GetDesiredNodesAction.NAME,
            transportService,
            clusterService,
            threadPool,
            actionFilters,
            GetDesiredNodesAction.Request::new,
            indexNameExpressionResolver,
            GetDesiredNodesAction.Response::new,
            ThreadPool.Names.SAME
        );
    }

    @Override
    protected void masterOperation(
        Task task,
        GetDesiredNodesAction.Request request,
        ClusterState state,
        ActionListener listener
    ) throws Exception {
        final DesiredNodes latestDesiredNodes = DesiredNodes.latestFromClusterState(state);
        if (latestDesiredNodes == null) {
            listener.onFailure(new ResourceNotFoundException("Desired nodes not found"));
        } else {
            listener.onResponse(new GetDesiredNodesAction.Response(latestDesiredNodes));
        }
    }

    @Override
    protected ClusterBlockException checkBlock(GetDesiredNodesAction.Request request, ClusterState state) {
        return state.blocks().globalBlockedException(ClusterBlockLevel.METADATA_READ);
    }
}