/*
 * Copyright 2010 Google 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.google.gwt.logging.server;

import com.google.gwt.core.server.StackTraceDeobfuscator;
import com.google.gwt.logging.server.RemoteLoggingServiceUtil.RemoteLoggingException;
import com.google.gwt.logging.shared.RemoteLoggingService;
import com.google.gwt.user.server.rpc.RemoteServiceServlet;

import java.util.logging.Level;
import java.util.logging.LogRecord;
import java.util.logging.Logger;

/**
 * Server-side code for the remote log handler.
 */
public class RemoteLoggingServiceImpl extends RemoteServiceServlet implements RemoteLoggingService {

  private static Logger logger = Logger.getLogger(RemoteServiceServlet.class.getName());

  // No deobfuscator by default
  private StackTraceDeobfuscator deobfuscator = null;
  private String loggerNameOverride = null;

  /**
   * Logs a Log Record which has been serialized using GWT RPC on the server.
   * @return either an error message, or null if logging is successful.
   */
  public final String logOnServer(LogRecord lr) {
    String strongName = getPermutationStrongName();
    try {
      RemoteLoggingServiceUtil.logOnServer(
          lr, strongName, deobfuscator, loggerNameOverride);
    } catch (RemoteLoggingException e) {
      logger.log(Level.SEVERE, "Remote logging failed", e);
      return "Remote logging failed, check stack trace for details.";
    }
    return null;
  }
  
  /**
   * By default, messages are logged to a logger that has the same name as
   * the logger that created them on the client. If you want to log all messages
   * from the client to a logger with another name, you can set the override
   * using this method.
   */
  public void setLoggerNameOverride(String override) {
    loggerNameOverride = override;
  }
  
  /**
   * By default, this service does not do any deobfuscation. In order to do
   * server-side deobfuscation, you must copy the symbolMaps files to a
   * directory visible to the server and set the directory using this method.
   */
  public void setSymbolMapsDirectory(String symbolMapsDir) {
    deobfuscator = StackTraceDeobfuscator.fromFileSystem(symbolMapsDir);
  }
}