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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 static com.google.common.base.Preconditions.checkNotNull;

Stores/Reads cluster state from a local file (located at: "~/.whirr/cluster-name/instances")
public class FileClusterStateStore extends ClusterStateStore {
  private static final Logger LOG = LoggerFactory
      .getLogger(FileClusterStateStore.class);
  private ClusterSpec spec;
  public FileClusterStateStore(ClusterSpec spec) {
    checkNotNull(spec,"clusterSpec");
    this. = spec;
  }
  public Cluster load() throws IOException {
    File instancesFile = new File(.getClusterDirectory(), "instances");
    return unserialize(,
      Joiner.on("\n").join(Files.readLines(instancesFile.)));
  }
  public void destroy() throws IOException {
  }
  public void save(Cluster clusterthrows IOException {
    File instancesFile = new File(.getClusterDirectory(), "instances");
    try {
      Files.write(serialize(cluster).toString(), instancesFile.);
      .info("Wrote instances file {}"instancesFile);
    } catch (IOException e) {
      .error("Problem writing instances file {}"instancesFilee);
    }
  }
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