/*
* This file is part of the Wayback archival access software
* (http://archive-access.sourceforge.net/projects/wayback/).
*
* Licensed to the Internet Archive (IA) by one or more individual
* contributors.
*
* The IA 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.archive.wayback.resourcestore.indexer;
import java.io.File;
import java.io.IOException;
import org.archive.wayback.util.DirMaker;
/**
* Simple queue implementation, which uses a directory containing empty files
* to indicate the presence of items in a queue (set in this case...)
*
* @author brad
* @version $Date$, $Revision$
*/
public class DirectoryIndexQueue implements IndexQueue {
private File path = null;
/* (non-Javadoc)
* @see org.archive.wayback.resourcestore.indexer.IndexQueue#dequeue()
*/
public String dequeue() throws IOException {
String[] names = path.list();
for(String name : names) {
File tmp = new File(path,name);
if(tmp.isFile()) {
if(tmp.delete()) {
return name;
} else {
throw new IOException("Unable to dequeue/delete (" +
tmp.getAbsolutePath());
}
}
}
return null;
}
/* (non-Javadoc)
* @see org.archive.wayback.resourcestore.indexer.IndexQueue#enqueue(java.lang.String)
*/
public void enqueue(String resourceFileName) throws IOException {
File tmp = new File(path,resourceFileName);
if(!tmp.isFile()) {
tmp.createNewFile();
}
}
/**
* @return the path
*/
public String getPath() {
if(path != null) {
return path.getAbsolutePath();
}
return null;
}
/**
* @param path the path to set
* @throws IOException
*/
public void setPath(String path) throws IOException {
this.path = DirMaker.ensureDir(path);
}
/* (non-Javadoc)
* @see org.archive.wayback.resourcestore.indexer.IndexQueue#recordStatus(java.lang.String, int)
*/
public void recordStatus(String resourceFileName, int status) {
}
}