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Web Agent introspection runtime

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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.reflect;

import swim.kernel.KernelProxy;
import swim.structure.Value;
import swim.system.EdgeAddress;
import swim.system.EdgeBinding;

public class ReflectKernel extends KernelProxy {
  final double kernelPriority;

  public ReflectKernel(double kernelPriority) {
    this.kernelPriority = kernelPriority;
  }

  public ReflectKernel() {
    this(KERNEL_PRIORITY);
  }

  @Override
  public final double kernelPriority() {
    return this.kernelPriority;
  }

  @Override
  public EdgeBinding injectEdge(EdgeAddress edgeAddress, EdgeBinding edge) {
    return new MetaEdge(super.injectEdge(edgeAddress, edge));
  }

  private static final double KERNEL_PRIORITY = 2.0;

  public static ReflectKernel fromValue(Value moduleConfig) {
    final Value header = moduleConfig.getAttr("kernel");
    final String kernelClassName = header.get("class").stringValue(null);
    if (kernelClassName == null || ReflectKernel.class.getName().equals(kernelClassName)) {
      final double kernelPriority = header.get("priority").doubleValue(KERNEL_PRIORITY);
      return new ReflectKernel(kernelPriority);
    }
    return null;
  }
}