@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()];
FSDataInputStream fileStream;
try {
fileStream = blobStore.fileSystem().open(new Path(path, blobName));
} catch (IOException e) {
listener.onFailure(e);
return;
}
try {
int bytesRead;
while ((bytesRead = fileStream.read(buffer)) != -1) {
listener.onPartial(buffer, 0, bytesRead);
}
listener.onCompleted();
} catch (Exception e) {
try {
fileStream.close();
} catch (IOException e1) {
// ignore
}
listener.onFailure(e);
}
}
});
}
@Override
public boolean blobExists(String blobName) {
try {
return blobStore.fileSystem().exists(new Path(path, blobName));
} catch (Exception e) {
return false;
}
}
public ImmutableMap<String, BlobMetaData> listBlobs() throws IOException {
FileStatus[] files = blobStore.fileSystem().listStatus(path);
if (files == null || files.length == 0) {
return ImmutableMap.of();
}
ImmutableMap.Builder<String, BlobMetaData> builder = ImmutableMap.builder();
for (FileStatus file : files) {
builder.put(
file.getPath().getName(), new PlainBlobMetaData(file.getPath().getName(), file.getLen()));
}
return builder.build();
}
@Override
public ImmutableMap<String, BlobMetaData> listBlobsByPrefix(final @Nullable String blobNamePrefix)
throws IOException {
FileStatus[] files =
blobStore
.fileSystem()
.listStatus(
path,
new PathFilter() {
@Override
public boolean accept(Path path) {
return path.getName().startsWith(blobNamePrefix);
}
});
if (files == null || files.length == 0) {
return ImmutableMap.of();
}
ImmutableMap.Builder<String, BlobMetaData> builder = ImmutableMap.builder();
for (FileStatus file : files) {
builder.put(
file.getPath().getName(), new PlainBlobMetaData(file.getPath().getName(), file.getLen()));
}
return builder.build();
}
@Override
public boolean deleteBlob(String blobName) throws IOException {
return blobStore.fileSystem().delete(new Path(path, blobName), true);
}