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A framework for building native apps with React

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/**
 * Copyright (c) 2015-present, Facebook, Inc.
 * All rights reserved.
 *
 * This source code is licensed under the BSD-style license found in the
 * LICENSE file in the root directory of this source tree. An additional grant
 * of patent rights can be found in the PATENTS file in the same directory.
 */

package com.facebook.react.cxxbridge;

import javax.annotation.Nullable;

import com.facebook.jni.HybridData;
import com.facebook.soloader.SoLoader;
import com.facebook.proguard.annotations.DoNotStrip;
import com.facebook.react.bridge.JavaJSExecutor;

/**
 * JavaScript executor that delegates JS calls processed by native code back to a java version
 * of the native executor interface.
 *
 * When set as a executor with {@link CatalystInstance.Builder}, catalyst native code will delegate
 * low level javascript calls to the implementation of {@link JavaJSExecutor} interface provided
 * with the constructor of this class.
 */
@DoNotStrip
public class ProxyJavaScriptExecutor extends JavaScriptExecutor {
  public static class Factory implements JavaScriptExecutor.Factory {
    private final JavaJSExecutor.Factory mJavaJSExecutorFactory;

    public Factory(JavaJSExecutor.Factory javaJSExecutorFactory) {
      mJavaJSExecutorFactory = javaJSExecutorFactory;
    }

    @Override
    public JavaScriptExecutor create() throws Exception {
      return new ProxyJavaScriptExecutor(mJavaJSExecutorFactory.create());
    }
  }

  static {
    SoLoader.loadLibrary(CatalystInstanceImpl.REACT_NATIVE_LIB);
  }

  private @Nullable JavaJSExecutor mJavaJSExecutor;

  /**
   * Create {@link ProxyJavaScriptExecutor} instance
   * @param executor implementation of {@link JavaJSExecutor} which will be responsible for handling
   * javascript calls
   */
  public ProxyJavaScriptExecutor(JavaJSExecutor executor) {
    super(initHybrid(executor));
    mJavaJSExecutor = executor;
  }

  @Override
  public void close() {
    if (mJavaJSExecutor != null) {
      mJavaJSExecutor.close();
      mJavaJSExecutor = null;
    }
  }

  private native static HybridData initHybrid(JavaJSExecutor executor);
}