user/src/com/google/gwt/logging/client/SimpleRemoteLogHandler.java

/*
 * 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.client;

import com.google.gwt.core.client.GWT;
import com.google.gwt.logging.shared.RemoteLoggingService;
import com.google.gwt.logging.shared.RemoteLoggingServiceAsync;
import com.google.gwt.user.client.rpc.AsyncCallback;

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

/**
 * A very simple handler which sends messages to the server via GWT RPC to be
 * logged. Note that this logger does not do any intelligent batching of RPC's,
 * nor does it disable when the RPC calls fail repeatedly.
 */
public final class SimpleRemoteLogHandler extends RemoteLogHandlerBase {
  class DefaultCallback implements AsyncCallback<String> {
    public void onFailure(Throwable caught) {
      wireLogger.log(Level.SEVERE, "Remote logging failed: ", caught);
    }
    public void onSuccess(String result) {
      if (result != null) {
        wireLogger.severe("Remote logging failed: " + result);
      } else {
        wireLogger.finest("Remote logging message acknowledged");
      }
    }
  }
  
  private AsyncCallback<String> callback;
  private RemoteLoggingServiceAsync service;

  public SimpleRemoteLogHandler() {
    service = (RemoteLoggingServiceAsync) GWT.create(RemoteLoggingService.class);
    this.callback = new DefaultCallback();
  }
  
  @Override
  public void publish(LogRecord record) {
    if (isLoggable(record)) {
      service.logOnServer(record, callback);
    }
  }
}