org.elasticsearch.common.blobstore.url.AbstractURLBlobContainer Maven / Gradle / Ivy
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* 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 com.google.common.collect.ImmutableMap;
import org.apache.lucene.util.IOUtils;
import org.elasticsearch.common.blobstore.BlobMetaData;
import org.elasticsearch.common.blobstore.BlobPath;
import org.elasticsearch.common.blobstore.support.AbstractBlobContainer;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
/**
* URL blob implementation of {@link org.elasticsearch.common.blobstore.BlobContainer}
*/
public abstract class AbstractURLBlobContainer extends AbstractBlobContainer {
protected final URLBlobStore blobStore;
protected final URL path;
/**
* Constructs new AbstractURLBlobContainer
*
* @param blobStore blob store
* @param blobPath blob path for this container
* @param path URL for this container
*/
public AbstractURLBlobContainer(URLBlobStore blobStore, BlobPath blobPath, URL path) {
super(blobPath);
this.blobStore = blobStore;
this.path = path;
}
/**
* Returns URL for this container
*
* @return URL for this container
*/
public URL url() {
return this.path;
}
/**
* This operation is not supported by AbstractURLBlobContainer
*/
@Override
public ImmutableMap listBlobs() throws IOException {
throw new UnsupportedOperationException("URL repository doesn't support this operation");
}
/**
* This operation is not supported by AbstractURLBlobContainer
*/
@Override
public boolean deleteBlob(String blobName) throws IOException {
throw new UnsupportedOperationException("URL repository is read only");
}
/**
* This operation is not supported by AbstractURLBlobContainer
*/
@Override
public boolean blobExists(String blobName) {
throw new UnsupportedOperationException("URL repository doesn't support this operation");
}
/**
* {@inheritDoc}
*/
@Override
public void readBlob(final String blobName, final ReadBlobListener listener) {
blobStore.executor().execute(new Runnable() {
@Override
public void run() {
byte[] buffer = new byte[blobStore.bufferSizeInBytes()];
InputStream is = null;
try {
is = new URL(path, blobName).openStream();
int bytesRead;
while ((bytesRead = is.read(buffer)) != -1) {
listener.onPartial(buffer, 0, bytesRead);
}
} catch (Throwable t) {
IOUtils.closeWhileHandlingException(is);
listener.onFailure(t);
return;
}
try {
IOUtils.closeWhileHandlingException(is);
listener.onCompleted();
} catch (Throwable t) {
listener.onFailure(t);
}
}
});
}
}