/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 gobblin.runtime.api;
import java.net.URI;
import com.google.common.base.Objects;
import gobblin.annotation.Alpha;
import gobblin.util.callbacks.Callback;
/**
* A listener for changes to the {@link JobSpec}s of a {@link JobCatalog}.
*/
@Alpha
public interface JobCatalogListener {
/** Invoked when a new JobSpec is added to the catalog and for all pre-existing jobs on registration
* of the listener.*/
void onAddJob(JobSpec addedJob);
/**
* Invoked when a JobSpec gets removed from the catalog.
*/
public void onDeleteJob(URI deletedJobURI, String deletedJobVersion);
/**
* Invoked when the contents of a JobSpec gets updated in the catalog.
*/
public void onUpdateJob(JobSpec updatedJob);
/** A standard implementation of onAddJob as a functional object */
public static class AddJobCallback extends Callback<JobCatalogListener, Void> {
private final JobSpec _addedJob;
public AddJobCallback(JobSpec addedJob) {
super(Objects.toStringHelper("onAddJob").add("addedJob", addedJob).toString());
_addedJob = addedJob;
}
@Override public Void apply(JobCatalogListener listener) {
listener.onAddJob(_addedJob);
return null;
}
}
/** A standard implementation of onDeleteJob as a functional object */
public static class DeleteJobCallback extends Callback<JobCatalogListener, Void> {
private final URI _deletedJobURI;
private final String _deletedJobVersion;
public DeleteJobCallback(URI deletedJobURI, String deletedJobVersion) {
super(Objects.toStringHelper("onDeleteJob")
.add("deletedJobURI", deletedJobURI)
.add("deletedJobVersion", deletedJobVersion)
.toString());
_deletedJobURI = deletedJobURI;
_deletedJobVersion = deletedJobVersion;
}
@Override public Void apply(JobCatalogListener listener) {
listener.onDeleteJob(_deletedJobURI, _deletedJobVersion);
return null;
}
}
public static class UpdateJobCallback extends Callback<JobCatalogListener, Void> {
private final JobSpec _updatedJob;
public UpdateJobCallback(JobSpec updatedJob) {
super(Objects.toStringHelper("onUpdateJob")
.add("updatedJob", updatedJob).toString());
_updatedJob = updatedJob;
}
@Override
public Void apply(JobCatalogListener listener) {
listener.onUpdateJob(_updatedJob);
return null;
}
}
}