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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 act.util.SingletonBase;
import org.joda.time.DateTime;
import org.osgl.exception.ConfigurationException;
import org.osgl.util.C;
import java.util.Map;
/**
* The base implementation of {@link Daemon}
*/
@SuppressWarnings("unused")
public abstract class DaemonBase extends SingletonBase implements Daemon {
private State state = State.STOPPED;
private Exception lastError;
private DateTime ts = DateTime.now();
private DateTime errTs;
private Map<String, Object> attributes = C.newMap();
@Override
public final void restart() {
try {
stop();
} finally {
start();
}
}
@Override
public final void start() {
synchronized (this) {
if (state == State.STARTED || state == State.STARTING) {
return;
}
setState(State.STARTING);
}
try {
setup();
App.instance().jobManager().now(this);
} catch (Exception e) {
onException(e, "error starting daemon: %s", id());
return;
}
synchronized (this) {
setState(State.STARTED);
}
info("Daemon[%s] started", id());
}
@Override
public final void stop() {
synchronized (this) {
if (state == State.STOPPED || state == State.STOPPING) {
return;
}
setState(State.STOPPING);
}
try {
teardown();
} catch (Exception e) {
onException(e, "error stopping daemon: %s", id());
return;
}
synchronized (this){
setState(State.STOPPED);
}
info("Daemon[%s] stopped", id());
}
@Override
public final void run() {
try {
doJob();
} catch (Exception e) {
onException(e, "Error executing daemon: %s", id());
}
}
/**
* Execute the main logic
*/
protected abstract void doJob() throws Exception;
@Override
public synchronized State state() {
return state;
}
@Override
public DateTime timestamp() {
return ts;
}
protected void setup() throws Exception {}
protected void teardown() throws Exception {}
@Override
protected void releaseResources() {
try {
stop();
} finally {
super.releaseResources();
}
}
/**
* Returns the full class name of this daemon.
*
* Sub class can override this method to provide short version
*
* @return id of this daemon
*/
@Override
public String id() {
return getClass().getName();
}
@Override
public Exception lastError() {
return lastError;
}
@Override
public DateTime errorTimestamp() {
return errTs;
}
@Override
public synchronized void setAttribute(String key, Object value) {
attributes.put(key, value);
}
@Override
public synchronized void removeAttribute(String key) {
attributes.remove(key);
}
@Override
public synchronized <T> T getAttribute(String key) {
return (T) attributes.get(key);
}
public Map<String, Object> getAttributes() {
return C.newMap(attributes);
}
protected synchronized void onException(Exception e, String message, Object... args) {
this.lastError = e;
setState(errorState(e));
error(e, message, args);
}
private State errorState(Exception e) {
return isFatal(e) ? State.FATAL : State.ERROR;
}
protected boolean isFatal(Exception e) {
return e instanceof ConfigurationException;
}
/**
* Set last error without updating the state and logging the message
* @param e the error
*/
protected synchronized void setLastError(Exception e) {
this.lastError = e;
}
private void setState(State state) {
this.state = state;
ts = DateTime.now();
if (state == State.ERROR) {
errTs = ts;
}
}
}