/**
* 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 org.apache.whirr.service;
import org.apache.commons.io.IOUtils;
import org.apache.whirr.Cluster;
import org.apache.whirr.ClusterSpec;
import org.jclouds.blobstore.BlobStore;
import org.jclouds.blobstore.BlobStoreContext;
import org.jclouds.blobstore.domain.Blob;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.IOException;
import static com.google.common.base.Preconditions.checkNotNull;
public class BlobClusterStateStore extends ClusterStateStore {
private static final Logger LOG = LoggerFactory
.getLogger(FileClusterStateStore.class);
private ClusterSpec spec;
private BlobStoreContext context;
private String container;
private String blobName;
public BlobClusterStateStore(ClusterSpec spec) {
this.spec = spec;
this.context = BlobStoreContextBuilder.build(spec);
this.container = checkNotNull(spec.getStateStoreContainer());
this.blobName = checkNotNull(spec.getStateStoreBlob());
/* create container if it does not already exists */
if (!context.getBlobStore().containerExists(container)) {
context.getBlobStore().createContainerInLocation(null, container);
}
}
@Override
public Cluster load() throws IOException {
Blob blob = context.getBlobStore().getBlob(container, blobName);
if (blob != null) {
return unserialize(spec,
IOUtils.toString(blob.getPayload().getInput(), "utf-8"));
}
return null;
}
@Override
public void save(Cluster cluster) throws IOException {
BlobStore store = context.getBlobStore();
Blob blob = store.newBlob(blobName);
blob.setPayload(serialize(cluster));
store.putBlob(container, blob);
LOG.info("Saved cluster state to '{}' ", context.getSigner()
.signGetBlob(container, blobName).getEndpoint().toString());
}
@Override
public void destroy() throws IOException {
context.getBlobStore().removeBlob(container, blobName);
}
}