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  * Copyright (c) OSGi Alliance (2004, 2013). All Rights Reserved.
  * 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
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * See the License for the specific language governing permissions and
 * limitations under the License.
package org.osgi.service.dmt.notification.spi;
The RemoteAlertSender can be used to send notifications to (remote) entities identified by principal names. This service is provided by Protocol Adapters, and is used by the org.osgi.service.dmt.notification.NotificationService when sending alerts. Implementations of this interface have to be able to connect and send alerts to one or more management servers in a protocol specific way.

The properties of the service registration should specify a list of destinations (principals) where the service is capable of sending alerts. This can be done by providing a String array of principal names in the principals registration property. If this property is not registered, the service will be treated as the default sender. The default alert sender is only used when a more specific alert sender cannot be found.

The principals registration property is used when the org.osgi.service.dmt.notification.NotificationService.sendNotification(java.lang.String,int,java.lang.String,org.osgi.service.dmt.notification.AlertItem[]) method is called, to find the proper RemoteAlertSender for the given destination. If the caller does not specify a principal, the alert is only sent if the Notification Sender finds a default alert sender, or if the choice is unambiguous for some other reason (for example if only one alert sender is registered).

$Id: a24a035f3110fb96d009ccb7e94006915fee43c4 $
public interface RemoteAlertSender {
Sends an alert to a server identified by its principal name. In case the alert is sent in response to a previous execute command, a correlation identifier can be specified to provide the association between the execute and the alert.

The principal parameter specifies which server the alert should be sent to. This parameter can be null if the client does not know the name of the destination. The alert should still be delivered if possible; for example if the alert sender is only connected to one destination.

Any exception thrown on this method will be propagated to the original sender of the event, wrapped in a DmtException with the code REMOTE_ERROR.

Since sending the alert and receiving acknowledgment for it is potentially a very time-consuming operation, alerts are sent asynchronously. This method should attempt to ensure that the alert can be sent successfully, and should throw an exception if it detects any problems. If the method returns without error, the alert is accepted for sending and the implementation must make a best-effort attempt to deliver it.

principal the name identifying the server where the alert should be sent, can be null
code the alert code, can be 0 if not needed
correlator the correlation identifier of an associated EXEC command, or null if there is no associated EXEC
items the data of the alert items carried in this alert, can be empty or null if no alert items are needed
java.lang.Exception if the alert can not be sent to the server
	void sendAlert(String principalint codeString correlatorAlertItem[] itemsthrows Exception;
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