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    • org.smallmind.claxon.registry.ObservableTracker Maven / Gradle / Ivy

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    /*
 * Copyright (c) 2007 through 2024 David Berkman
 *
 * This file is part of the SmallMind Code Project.
 *
 * The SmallMind Code Project is free software, you can redistribute
 * it and/or modify it under either, at your discretion...
 *
 * 1) The terms of GNU Affero General Public License as published by the
 * Free Software Foundation, either version 3 of the License, or (at
 * your option) any later version.
 *
 * ...or...
 *
 * 2) The terms of the Apache License, Version 2.0.
 *
 * The SmallMind Code Project is distributed in the hope that it will
 * be useful, but WITHOUT ANY WARRANTY; without even the implied warranty
 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License or Apache License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * and the Apache License along with the SmallMind Code Project. If not, see
 *  or .
 *
 * Additional permission under the GNU Affero GPL version 3 section 7
 * ------------------------------------------------------------------
 * If you modify this Program, or any covered work, by linking or
 * combining it with other code, such other code is not for that reason
 * alone subject to any of the requirements of the GNU Affero GPL
 * version 3.
 */
package org.smallmind.claxon.registry;

import java.lang.ref.Reference;
import java.lang.ref.ReferenceQueue;
import java.lang.ref.WeakReference;
import java.util.Observable;
import org.smallmind.claxon.registry.meter.Meter;
import org.smallmind.claxon.registry.meter.MeterBuilder;

public class ObservableTracker {

  private final ReferenceQueue referenceQueue = new ReferenceQueue<>();
  private final ClaxonRegistry registry;

  public ObservableTracker (ClaxonRegistry registry) {

    this.registry = registry;
  }

  public  O track (Class caller, MeterBuilder builder, O observable, Tag... tags) {

    new RegisteredWeakReference<>(observable, referenceQueue, caller, tags);

    observable.addObserver((Observable obs, Object arg) -> {

      Meter meter = registry.register(caller, builder, tags);

      if (Number.class.isAssignableFrom(arg.getClass())) {
        meter.update(((Number)arg).longValue());
      } else if (String.class.equals(arg.getClass())) {
        meter.update(Long.parseLong((String)arg));
      } else {
        throw new IllegalArgumentException("Must be a long value(" + arg + ")");
      }
    });

    return observable;
  }

  public void sweep () {

    Reference sweptReference;

    while ((sweptReference = referenceQueue.poll()) != null) {

      registry.unregister(((RegisteredWeakReference)sweptReference).getCaller(), ((RegisteredWeakReference)sweptReference).getTags());
    }
  }

  private static class RegisteredWeakReference extends WeakReference {

    private final Tag[] tags;
    private final Class caller;

    public RegisteredWeakReference (O referent, ReferenceQueue q, Class caller, Tag... tags) {

      super(referent, q);

      this.caller = caller;
      this.tags = tags;
    }

    public Class getCaller () {

      return caller;
    }

    public Tag[] getTags () {

      return tags;
    }
  }
}    
    
    
    

    




    
    
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