| /** |
| * 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.hadoop.raid.protocol; |
| |
| import java.io.IOException; |
| import java.io.DataInput; |
| import java.io.DataOutput; |
| import java.util.Collection; |
| import java.util.List; |
| import java.util.LinkedList; |
| import java.util.Comparator; |
| |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| import org.apache.hadoop.io.Writable; |
| import org.apache.hadoop.io.WritableFactories; |
| import org.apache.hadoop.io.WritableFactory; |
| import org.apache.hadoop.fs.Path; |
| import org.apache.hadoop.fs.FileSystem; |
| import org.apache.hadoop.conf.Configuration; |
| |
| /** |
| * Maintains informatiom about all policies that belong to a category. |
| * These policies have to be applied one-at-a-time and cannot be run |
| * simultaneously. |
| */ |
| public class PolicyList implements Writable { |
| public static final Log LOG = LogFactory.getLog( |
| "org.apache.hadoop.raid.protocol.PolicyList"); |
| |
| private List<PolicyInfo> category; // list of policies |
| private Path srcPath; |
| |
| /** |
| * Create a new category of policies. |
| */ |
| public PolicyList() { |
| this.category = new LinkedList<PolicyInfo>(); |
| this.srcPath = null; |
| } |
| |
| /** |
| * Add a new policy to this category. |
| */ |
| public void add(PolicyInfo info) { |
| category.add(info); |
| } |
| |
| public void setSrcPath(Configuration conf, String src) throws IOException { |
| srcPath = new Path(src); |
| srcPath = srcPath.makeQualified(srcPath.getFileSystem(conf)); |
| } |
| |
| public Path getSrcPath() { |
| return srcPath; |
| } |
| |
| /** |
| * Returns the policies in this category |
| */ |
| public Collection<PolicyInfo> getAll() { |
| return category; |
| } |
| |
| /** |
| * Sort Categries based on their srcPath. reverse lexicographical order. |
| */ |
| public static class CompareByPath implements Comparator<PolicyList> { |
| public CompareByPath() throws IOException { |
| } |
| public int compare(PolicyList l1, PolicyList l2) { |
| return 0 - l1.getSrcPath().compareTo(l2.getSrcPath()); |
| } |
| } |
| |
| |
| ////////////////////////////////////////////////// |
| // Writable |
| ////////////////////////////////////////////////// |
| static { // register a ctor |
| WritableFactories.setFactory |
| (PolicyList.class, |
| new WritableFactory() { |
| public Writable newInstance() { return new PolicyList(); } |
| }); |
| } |
| |
| public void write(DataOutput out) throws IOException { |
| out.writeInt(category.size()); |
| for (PolicyInfo p : category) { |
| p.write(out); |
| } |
| } |
| |
| public void readFields(DataInput in) throws IOException { |
| int count = in.readInt(); |
| for (int i = 0; i < count; i++) { |
| PolicyInfo p = new PolicyInfo(); |
| p.readFields(in); |
| add(p); |
| } |
| } |
| } |