de.arbeitsagentur.opdt.keycloak.cassandra.cache.L1CacheInterceptor Maven / Gradle / Ivy

Go to download
/*
 * Copyright 2022 IT-Systemhaus der Bundesagentur fuer Arbeit
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * 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 de.arbeitsagentur.opdt.keycloak.cassandra.cache;

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.util.Arrays;
import java.util.HashSet;
import java.util.Set;
import java.util.stream.Collectors;
import lombok.RequiredArgsConstructor;
import lombok.extern.jbosslog.JBossLog;
import org.keycloak.models.KeycloakSession;

@JBossLog
@RequiredArgsConstructor
public class L1CacheInterceptor implements InvocationHandler {
  private static final Set CACHE_INVALIDATION_NAMES = new HashSet<>();

  static {
    CACHE_INVALIDATION_NAMES.add("create");
    CACHE_INVALIDATION_NAMES.add("update");
    CACHE_INVALIDATION_NAMES.add("add");
    CACHE_INVALIDATION_NAMES.add("delete");
    CACHE_INVALIDATION_NAMES.add("remove");
    CACHE_INVALIDATION_NAMES.add("insert");
    CACHE_INVALIDATION_NAMES.add("make");
  }

  private final KeycloakSession session;
  private final Object target;

  @Override
  public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
    Method classMethod = target.getClass().getMethod(method.getName(), method.getParameterTypes());
    L1Cached cacheAnnotation = classMethod.getAnnotation(L1Cached.class);

    if (cacheAnnotation == null) {
      return method.invoke(target, args);
    }

    String cacheName = cacheAnnotation.cacheName();
    boolean invalidateCache = classMethod.getAnnotation(InvalidateCache.class) != null;

    if (invalidateCache) {
      if (log.isTraceEnabled()) {
        log.tracef(
            "Cache wird invalidiert durch Methode %s (%s)",
            method.getName(),
            Arrays.stream(args)
                .map(Object::getClass)
                .map(Object::toString)
                .collect(Collectors.joining(", ")));
      }

      KeycloakSessionCache.reset(session, cacheName);

      return method.invoke(target, args);
    } else if (CACHE_INVALIDATION_NAMES.stream()
        .anyMatch(name -> method.getName().toLowerCase().contains(name))) {
      log.warnf(
          "Method %s(%s) might need to invalidate cache but isnt annotated with @InvalidateCache",
          method.getName(),
          Arrays.stream(args)
              .map(Object::getClass)
              .map(Object::toString)
              .collect(Collectors.joining(", ")));
    }

    CacheInvocationContext cacheInvocationContext =
        CacheInvocationContext.create(target, method, args);

    Object result = KeycloakSessionCache.get(session, cacheName, cacheInvocationContext);
    long timestamp = System.currentTimeMillis();

    if (KeycloakSessionCache.NONE == result) {
      result = method.invoke(target, args);

      if (log.isTraceEnabled()) {
        log.tracef(
            "Uncached Call %s - %s",
            cacheInvocationContext.getTargetMethod(),
            (System.currentTimeMillis() - timestamp) + "ms");
      }

      KeycloakSessionCache.put(session, cacheName, cacheInvocationContext, result);
    } else if (log.isTraceEnabled()) {
      log.tracef(
          "Cached Result for Call %s - %s",
          cacheInvocationContext.getTargetMethod(),
          (System.currentTimeMillis() - timestamp) + "ms");
    }

    return result;
  }
}