org.jclouds.blobstore.strategy.internal.ListBlobMetadataInContainer.java Source code

Introduction

Here is the source code for org.jclouds.blobstore.strategy.internal.ListBlobMetadataInContainer.java

Source

/**
 *
 * Copyright (C) 2009 Cloud Conscious, LLC. <info@cloudconscious.com>
 *
 * ====================================================================
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF 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.jclouds.blobstore.strategy.internal;

import java.util.SortedSet;
import java.util.concurrent.TimeUnit;

import javax.inject.Named;
import javax.inject.Singleton;

import org.jclouds.blobstore.AsyncBlobStore;
import org.jclouds.blobstore.domain.BlobMetadata;
import org.jclouds.blobstore.domain.ListResponse;
import org.jclouds.blobstore.domain.ResourceMetadata;
import org.jclouds.blobstore.domain.ResourceType;
import org.jclouds.blobstore.internal.BlobRuntimeException;
import org.jclouds.blobstore.options.ListContainerOptions;
import org.jclouds.blobstore.reference.BlobStoreConstants;
import org.jclouds.blobstore.strategy.ListBlobMetadataStrategy;
import org.jclouds.util.Utils;

import com.google.common.collect.Sets;
import com.google.inject.Inject;

/**
 * Retrieves all blobs in the blobstore by the most efficient means possible.
 * 
 * @author Adrian Cole
 */
@Singleton
public class ListBlobMetadataInContainer implements ListBlobMetadataStrategy {
    /**
     * maximum duration of an blob Request
     */
    @Inject(optional = true)
    @Named(BlobStoreConstants.PROPERTY_BLOBSTORE_TIMEOUT)
    protected long requestTimeoutMilliseconds = 30000;
    protected final AsyncBlobStore connection;

    @Inject
    ListBlobMetadataInContainer(AsyncBlobStore connection) {
        this.connection = connection;
    }

    public SortedSet<? extends BlobMetadata> execute(String container, ListContainerOptions options) {
        try {
            ListResponse<? extends ResourceMetadata> resources = connection.list(container, options)
                    .get(requestTimeoutMilliseconds, TimeUnit.MILLISECONDS);
            SortedSet<BlobMetadata> blobM = Sets.newTreeSet();
            for (ResourceMetadata from : resources) {
                if (from.getType() == ResourceType.BLOB)
                    blobM.add((BlobMetadata) from);
            }
            return blobM;
        } catch (Exception e) {
            Utils.<BlobRuntimeException>rethrowIfRuntimeOrSameType(e);
            throw new BlobRuntimeException("Error getting resource metadata in container: " + container, e);
        }
    }

}