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Instrumentation of Java libraries using OpenTelemetry.

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/*
 * Copyright The OpenTelemetry Authors
 * SPDX-License-Identifier: Apache-2.0
 */

package io.opentelemetry.javaagent.bootstrap.internal;

import io.opentelemetry.instrumentation.api.internal.GuardedBy;
import io.opentelemetry.instrumentation.api.internal.cache.Cache;
import java.net.URL;
import java.util.ArrayList;
import java.util.List;

/**
 * A holder of all ClassLoaderMatcher caches. We store them in the bootstrap class loader so that
 * instrumentation can invalidate the ClassLoaderMatcher for a particular ClassLoader, e.g. when
 * {@link java.net.URLClassLoader#addURL(URL)} is called.
 *
 * This class is internal and is hence not for public use. Its APIs are unstable and can change
 * at any time.
 */
public final class ClassLoaderMatcherCacheHolder {

  @GuardedBy("allCaches")
  private static final List> allCaches = new ArrayList<>();

  private ClassLoaderMatcherCacheHolder() {}

  public static void addCache(Cache cache) {
    synchronized (allCaches) {
      allCaches.add(cache);
    }
  }

  public static void invalidateAllCachesForClassLoader(ClassLoader loader) {
    synchronized (allCaches) {
      for (Cache cache : allCaches) {
        cache.remove(loader);
      }
    }
  }
}