/*
* Copyright © 2015 Cask Data, 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 co.cask.cdap.internal.app.runtime.artifact;
import co.cask.cdap.common.service.RetryOnStartFailureService;
import co.cask.cdap.common.service.RetryStrategies;
import co.cask.cdap.proto.security.Principal;
import co.cask.cdap.security.spi.authentication.SecurityRequestContext;
import com.google.common.base.Supplier;
import com.google.common.util.concurrent.AbstractService;
import com.google.common.util.concurrent.Service;
import com.google.inject.Inject;
import java.util.concurrent.TimeUnit;
/**
* Thread that scans the local filesystem for system artifacts and adds them to the artifact repository if they
* are not already there.
*/
public final class SystemArtifactLoader extends AbstractService {
private final Service serviceDelegate;
@Inject
SystemArtifactLoader(final ArtifactRepository artifactRepository) {
this.serviceDelegate = new RetryOnStartFailureService(new Supplier<Service>() {
@Override
public Service get() {
return new AbstractService() {
@Override
protected void doStart() {
String oldUserId = SecurityRequestContext.getUserId();
try {
SecurityRequestContext.setUserId(Principal.SYSTEM.getName());
artifactRepository.addSystemArtifacts();
// if there is no exception, all good, continue on
notifyStarted();
} catch (Exception e) {
// transient error, fail it and retry
notifyFailed(e);
} finally {
SecurityRequestContext.setUserId(oldUserId);
}
}
@Override
protected void doStop() {
notifyStopped();
}
};
}
}, RetryStrategies.exponentialDelay(200, 5000, TimeUnit.MILLISECONDS));
}
@Override
protected void doStart() {
serviceDelegate.start();
notifyStarted();
}
@Override
protected void doStop() {
serviceDelegate.stop();
notifyStopped();
}
}