io.druid.storage.cloudfiles.CloudFilesByteSource.java Source code

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Here is the source code for io.druid.storage.cloudfiles.CloudFilesByteSource.java

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/*
 * Licensed to Metamarkets Group Inc. (Metamarkets) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. Metamarkets 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 io.druid.storage.cloudfiles;

import com.google.common.base.Throwables;
import com.google.common.io.ByteSource;
import org.jclouds.io.Payload;

import java.io.IOException;
import java.io.InputStream;

public class CloudFilesByteSource extends ByteSource {

    final private CloudFilesObjectApiProxy objectApi;
    final private String path;
    private Payload payload;

    public CloudFilesByteSource(CloudFilesObjectApiProxy objectApi, String path) {
        this.objectApi = objectApi;
        this.path = path;
        this.payload = null;
    }

    public void closeStream() throws IOException {
        if (payload != null) {
            payload.close();
            payload = null;
        }
    }

    @Override
    public InputStream openStream() throws IOException {
        payload = (payload == null) ? objectApi.get(path).getPayload() : payload;

        try {
            return payload.openStream();
        } catch (IOException e) {
            if (CloudFilesUtils.CLOUDFILESRETRY.apply(e)) {
                throw new IOException("Recoverable exception", e);
            }
            throw Throwables.propagate(e);
        }
    }
}