NativeLogger.java

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// Copyright 2012 Cloudera Inc.
//
// 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 com.cloudera.impala.util;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class NativeLogger {
  private final static Logger LOG = LoggerFactory.getLogger(NativeLogger.class);
  private static boolean loaded_ = false;

  // Writes a log message to glog
  private native static void Log(int severity, String msg, String filename, int line);

  public static void LogToGlog(int severity, String msg, String filename, int line) {
    try {
      Log(severity, msg, filename, line);
    } catch (UnsatisfiedLinkError e) {
      loadLibrary();
      Log(severity, msg, filename, line);
    }
  }

  private static synchronized void loadLibrary() {
    if (loaded_) return;
    NativeLibUtil.loadLibrary("libloggingsupport.so");
    loaded_ = true;
  }
}