java/fury-core/src/test/java/org/apache/fury/TestUtils.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 org.apache.fury;

import com.google.common.collect.ImmutableBiMap;
import com.google.common.collect.ImmutableMap;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.ObjectOutputStream;
import java.util.ArrayList;
import java.util.function.Supplier;
import org.apache.fury.util.FieldAccessor;
import org.apache.fury.util.ReflectionUtils;
import org.apache.fury.util.unsafe._JDKAccess;
import org.testng.SkipException;

/** Test utils. */
public class TestUtils {
  @SuppressWarnings("unchecked")
  public static <T> T getFieldValue(Object obj, String fieldName) {
    return (T)
        FieldAccessor.createAccessor(ReflectionUtils.getField(obj.getClass(), fieldName)).get(obj);
  }

  public static <K, V> ImmutableMap<K, V> mapOf(K k1, V v1) {
    return ImmutableBiMap.of(k1, v1);
  }

  /**
   * Trigger OOM for SoftGC by allocate more memory.
   *
   * @param predicate whether stop Trigger OOM.
   */
  public static void triggerOOMForSoftGC(Supplier<Boolean> predicate) {
    if (_JDKAccess.IS_OPEN_J9) {
      throw new SkipException("OpenJ9 unsupported");
    }
    System.gc();
    while (predicate.get()) {
      triggerOOM();
      System.gc();
      System.out.printf("Wait gc.");
      try {
        Thread.sleep(50);
      } catch (InterruptedException e1) {
        throw new RuntimeException(e1);
      }
    }
  }

  private static void triggerOOM() {
    while (true) {
      // Force an OOM
      try {
        final ArrayList<Object[]> allocations = new ArrayList<>();
        int size;
        while ((size =
                Math.min(Math.abs((int) Runtime.getRuntime().freeMemory()), Integer.MAX_VALUE))
            > 0) allocations.add(new Object[size]);
      } catch (OutOfMemoryError e) {
        System.out.println("Met OOM.");
        break;
      }
    }
  }

  public static byte[] jdkSerialize(Object data) {
    ByteArrayOutputStream bas = new ByteArrayOutputStream();
    jdkSerialize(bas, data);
    return bas.toByteArray();
  }

  public static void jdkSerialize(ByteArrayOutputStream bas, Object data) {
    bas.reset();
    try (ObjectOutputStream objectOutputStream = new ObjectOutputStream(bas)) {
      objectOutputStream.writeObject(data);
      objectOutputStream.flush();
    } catch (IOException e) {
      throw new RuntimeException(e);
    }
  }
}