nstream.adapter.common.patches.LatestValuePatch Maven / Gradle / Ivy

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// 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.adapter.common.patches;

import nstream.adapter.common.NstreamAgent;
import swim.api.SwimLane;
import swim.api.lane.CommandLane;
import swim.api.lane.ValueLane;
import swim.structure.Value;

public class LatestValuePatch extends NstreamAgent {

  public LatestValuePatch() {
  }

  protected Value extractValueFromEvent(Value event) {
    return event;
  }

  @SwimLane("latest")
  protected ValueLane latest = this.valueLane()
      .didSet((n, o) -> {
        trace("(LatestValuePatch) " + nodeUri()
            + ".latest#didSet(): newValue=" + n + ", oldValue=" + o);
      });

  @SwimLane("addEvent")
  protected CommandLane addEvent = this.commandLane()
      .onCommand(v -> {
        trace("(LatestValuePatch) " + nodeUri()
            + ".addEvent#onCommand(): value=" + v);
        this.latest.set(extractValueFromEvent(v));
      });

  @Override
  public void didStart() {
    info(nodeUri() + ": didStart");
  }

}