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/**
 * 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.hadoop.util;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.CommonConfigurationKeys;

/**
 * A helper to load the native hadoop code i.e. libhadoop.so.
 * This handles the fallback to either the bundled libhadoop-Linux-i386-32.so
 * or the default java implementations where appropriate.
 *
 */
@InterfaceAudience.Private
@InterfaceStability.Unstable
public class NativeCodeLoader {

	private static final Log LOG =
		LogFactory.getLog(NativeCodeLoader.class);

	private static boolean nativeCodeLoaded = false;

	static {
		LOG.info("Skipping native-hadoop library for flink-openstack-fs-hadoop's relocated Hadoop... " +
			"using builtin-java classes where applicable");
	}

	/**
	 * Check if native-hadoop code is loaded for this platform.
	 *
	 * @return true if native-hadoop is loaded,
	 *         else false
	 */
	public static boolean isNativeCodeLoaded() {
		return nativeCodeLoaded;
	}

	/**
	 * Returns true only if this build was compiled with support for snappy.
	 */
	public static native boolean buildSupportsSnappy();

	/**
	 * Returns true only if this build was compiled with support for openssl.
	 */
	public static native boolean buildSupportsOpenssl();

	public static native String getLibraryName();

	/**
	 * Return if native hadoop libraries, if present, can be used for this job.
	 * @param conf configuration
	 *
	 * @return true if native hadoop libraries, if present, can be
	 *         used for this job; false otherwise.
	 */
	public boolean getLoadNativeLibraries(Configuration conf) {
		return conf.getBoolean(CommonConfigurationKeys.IO_NATIVE_LIB_AVAILABLE_KEY,
			CommonConfigurationKeys.IO_NATIVE_LIB_AVAILABLE_DEFAULT);
	}

	/**
	 * Set if native hadoop libraries, if present, can be used for this job.
	 *
	 * @param conf configuration
	 * @param loadNativeLibraries can native hadoop libraries be loaded
	 */
	public void setLoadNativeLibraries(Configuration conf,
									   boolean loadNativeLibraries) {
		conf.setBoolean(CommonConfigurationKeys.IO_NATIVE_LIB_AVAILABLE_KEY,
			loadNativeLibraries);
	}

}