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Daemon.java
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package act.app;
/*-
* #%L
* ACT Framework
* %%
* Copyright (C) 2014 - 2017 ActFramework
* %%
* 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.
* #L%
*/
import org.joda.time.DateTime;
import java.util.Map;
/**
* A daemon encapsulate a long running logic that can be
*
* * {@link #start() started}
* * {@link #stop() stopped}
* * {@link #restart() restart}
* * Check {@link #state() state}
*/
public interface Daemon extends Runnable {
enum State {
STOPPING, STOPPED, STARTING, STARTED, ERROR, FATAL
}
/**
* Start this daemon
*/
void start();
/**
* Stop this daemon
*/
void stop();
/**
* {@link #stop() stop} this daemon first and then {@link #start() start}
*/
void restart();
/**
* Returns the {@link State state} of this daemon
* @return the state
*/
State state();
/**
* Returns the timestamp when last state transfer happening
* @return the timestamp
*/
DateTime timestamp();
/**
* Returns ID of the daemon logic
* @return ID
*/
String id();
/**
* Returns last error
* @return the last error encountered
*/
Exception lastError();
/**
* Returns the timestamp when last error happening
* @return the timestamp
*/
DateTime errorTimestamp();
/**
* Set an attribute to the daemon
* @param key the attribute key
* @param value attribute value
*/
void setAttribute(String key, Object value);
/**
* Remove an attribute from a daemon
* @param key the attribute key
*/
void removeAttribute(String key);
/**
* Return the attribute set to the daemon
* @param key the attribute key
* @param <T> the gneric type of the attribute value
* @return the attribute value
*/
<T> T getAttribute(String key);
/**
* Returns all attributes set on this daemon
* @return the attributes set on this daemon
*/
Map<String, Object> getAttributes();
}