org.forstdb.AbstractTransactionNotifier Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of forstjni Show documentation

ForSt fat jar with modifications specific for Apache Flink that contains .so files for linux32 and linux64 (glibc and musl-libc), jnilib files for Mac OSX, and a .dll for Windows x64.

The newest version!

// Copyright (c) 2011-present, Facebook, Inc.  All rights reserved.
//  This source code is licensed under both the GPLv2 (found in the
//  COPYING file in the root directory) and Apache 2.0 License
//  (found in the LICENSE.Apache file in the root directory).

package org.forstdb;

/**
 * Provides notification to the caller of SetSnapshotOnNextOperation when
 * the actual snapshot gets created
 */
public abstract class AbstractTransactionNotifier
    extends RocksCallbackObject {

  protected AbstractTransactionNotifier() {
    super();
  }

  /**
   * Implement this method to receive notification when a snapshot is
   * requested via {@link Transaction#setSnapshotOnNextOperation()}.
   *
   * @param newSnapshot the snapshot that has been created.
   */
  public abstract void snapshotCreated(final Snapshot newSnapshot);

  /**
   * This is intentionally private as it is the callback hook
   * from JNI
   */
  private void snapshotCreated(final long snapshotHandle) {
    snapshotCreated(new Snapshot(snapshotHandle));
  }

  @Override
  protected long initializeNative(final long... nativeParameterHandles) {
    return createNewTransactionNotifier();
  }

  private native long createNewTransactionNotifier();

  /**
   * Deletes underlying C++ TransactionNotifier pointer.
   * 
   * Note that this function should be called only after all
   * Transactions referencing the comparator are closed.
   * Otherwise, an undefined behavior will occur.
   */
  @Override
  protected void disposeInternal() {
    disposeInternal(nativeHandle_);
  }
  protected final native void disposeInternal(final long handle);
}