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Web Agent introspection runtime

There is a newer version: 4.13.21

// Copyright 2015-2024 Nstream, inc.
//
// Licensed under the Redis Source Available License 2.0 (RSALv2) Agreement;
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     https://redis.com/legal/rsalv2-agreement/
//
// 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.

package nstream.reflect.agent;

import nstream.reflect.MetaMesh;
import nstream.reflect.model.MeshStats;
import swim.api.lane.DemandLane;
import swim.api.lane.function.OnCue;
import swim.api.warp.WarpUplink;
import swim.structure.Record;
import swim.structure.Value;
import swim.uri.Uri;

public class MetaMeshAgent extends MetaGlobalAgent {
  final MetaMesh meta;
  Value globalKey;
  volatile DemandLane meshStats;

  public MetaMeshAgent(MetaMesh meta) {
    this.meta = meta;
  }

  @Override
  public MetaMesh meta() {
    return this.meta;
  }

  @Override
  public Value globalKey() {
    Value globalKey = this.globalKey;
    if (globalKey == null) {
      final Uri meshUri = this.meta.meshUri();
      if (meshUri.isDefined()) {
        globalKey = Record.create(1).attr("mesh", meshUri.toString());
      } else {
        globalKey = Record.create(1).attr("mesh");
      }
      this.globalKey = globalKey.commit();
    }
    return globalKey;
  }

  @Override
  protected void openLanes() {
    super.openLanes();
    final DemandLane meshStats = demandLane()
        .valueForm(MeshStats.form())
        .observe(new MetaMeshStatsController(this));
    openLane(MESH_STATS_URI, meshStats);
    this.meshStats = meshStats;
  }

  public MeshStats meshStats() {
    return this.meta.meshStats();
  }

  @Override
  public void cueStats() {
    super.cueStats();
    cueMeshStats();
  }

  protected void cueMeshStats() {
    final DemandLane meshStats = this.meshStats;
    if (meshStats != null) {
      meshStats.cue();
    }
  }

  static final Uri MESH_STATS_URI = Uri.parse("meshStats");
}

final class MetaMeshStatsController implements OnCue {
  final MetaMeshAgent agent;

  MetaMeshStatsController(MetaMeshAgent agent) {
    this.agent = agent;
  }

  @Override
  public MeshStats onCue(WarpUplink uplink) {
    return this.agent.meshStats();
  }
}