/*
* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch 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.elasticsearch.common.blobstore.url;
import org.elasticsearch.common.blobstore.BlobContainer;
import org.elasticsearch.common.blobstore.BlobPath;
import org.elasticsearch.common.blobstore.BlobStore;
import org.elasticsearch.common.blobstore.BlobStoreException;
import org.elasticsearch.common.component.AbstractComponent;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.unit.ByteSizeUnit;
import org.elasticsearch.common.unit.ByteSizeValue;
import org.elasticsearch.threadpool.ThreadPool;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.concurrent.Executor;
/**
* Read-only URL-based blob store
*/
public class URLBlobStore extends AbstractComponent implements BlobStore {
private final URL path;
private final int bufferSizeInBytes;
/**
* Constructs new read-only URL-based blob store
* <p/>
* The following settings are supported
* <dl>
* <dt>buffer_size</dt>
* <dd>- size of the read buffer, defaults to 100KB</dd>
* </dl>
*
* @param settings settings
* @param path base URL
*/
public URLBlobStore(Settings settings, URL path) {
super(settings);
this.path = path;
this.bufferSizeInBytes = (int) settings.getAsBytesSize("buffer_size", new ByteSizeValue(100, ByteSizeUnit.KB)).bytes();
}
/**
* {@inheritDoc}
*/
@Override
public String toString() {
return path.toString();
}
/**
* Returns base URL
*
* @return base URL
*/
public URL path() {
return path;
}
/**
* Returns read buffer size
*
* @return read buffer size
*/
public int bufferSizeInBytes() {
return this.bufferSizeInBytes;
}
/**
* {@inheritDoc}
*/
@Override
public BlobContainer blobContainer(BlobPath path) {
try {
return new URLBlobContainer(this, path, buildPath(path));
} catch (MalformedURLException ex) {
throw new BlobStoreException("malformed URL " + path, ex);
}
}
/**
* This operation is not supported by URL Blob Store
*
* @param path
*/
@Override
public void delete(BlobPath path) {
throw new UnsupportedOperationException("URL repository is read only");
}
/**
* {@inheritDoc}
*/
@Override
public void close() {
// nothing to do here...
}
/**
* Builds URL using base URL and specified path
*
* @param path relative path
* @return Base URL + path
* @throws MalformedURLException
*/
private URL buildPath(BlobPath path) throws MalformedURLException {
String[] paths = path.toArray();
if (paths.length == 0) {
return path();
}
URL blobPath = new URL(this.path, paths[0] + "/");
if (paths.length > 1) {
for (int i = 1; i < paths.length; i++) {
blobPath = new URL(blobPath, paths[i] + "/");
}
}
return blobPath;
}
}