org.akubraproject.rmi.client.ClientConnection.java Source code

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Here is the source code for org.akubraproject.rmi.client.ClientConnection.java

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/* $HeadURL$
 * $Id$
 *
 * Copyright (c) 2009-2010 DuraSpace
 * http://duraspace.org
 *
 * In collaboration with Topaz Inc.
 * http://www.topazproject.org
 *
 * Licensed 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.akubraproject.rmi.client;

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

import java.net.URI;

import java.util.Iterator;
import java.util.Map;

import org.apache.commons.io.IOUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import org.akubraproject.Blob;
import org.akubraproject.BlobStore;
import org.akubraproject.impl.AbstractBlobStoreConnection;
import org.akubraproject.impl.StreamManager;
import org.akubraproject.rmi.remote.RemoteBlob;
import org.akubraproject.rmi.remote.RemoteBlobCreator;
import org.akubraproject.rmi.remote.RemoteConnection;
import org.akubraproject.rmi.remote.RemoteIterator;

/**
 * Connection returned by the akubra-rmi-client that wraps a remote connection.
 *
 * @author Pradeep Krishnan
 */
class ClientConnection extends AbstractBlobStoreConnection {
    private static final Logger log = LoggerFactory.getLogger(ClientConnection.class);
    private final RemoteConnection remote;

    /**
     * Number of items to pre-fetch during iteration
     */
    public static int ITERATOR_BATCH_SIZE = 100;

    /**
     * Creates a new ClienteConnection object.
     *
     * @param store the blob store
     * @param strMgr the StreamManager
     * @param con the remote connection stub
     */
    public ClientConnection(BlobStore store, StreamManager strMgr, RemoteConnection con) {
        super(store, strMgr);
        this.remote = con;
    }

    @Override
    public void close() {
        if (!isClosed()) {
            super.close();

            try {
                remote.close();
            } catch (IOException e) {
                log.warn("Failed to close connection on remote server.", e);
            }
        }
    }

    @Override
    public Blob getBlob(URI blobId, Map<String, String> hints) throws IOException {
        ensureOpen();

        return new ClientBlob(this, streamManager, remote.getBlob(blobId, hints));
    }

    @Override
    public Blob getBlob(InputStream in, long estimatedSize, Map<String, String> hints) throws IOException {
        ensureOpen();
        if (in == null)
            throw new NullPointerException();

        RemoteBlobCreator bc = remote.getBlobCreator(estimatedSize, hints);
        RemoteBlob rb = null;
        try {
            OutputStream out = new ClientOutputStream(bc);
            IOUtils.copyLarge(in, out);
            out.close();
            rb = bc.shutDown(false);
            bc = null;
        } finally {
            try {
                if (bc != null)
                    bc.shutDown(true);
            } catch (Throwable t) {
                log.warn("Failed to shutdown remote blob creator", t);
            }
        }

        if (rb == null)
            throw new NullPointerException();

        return new ClientBlob(this, streamManager, rb);
    }

    @Override
    public Iterator<URI> listBlobIds(String filterPrefix) throws IOException {
        ensureOpen();

        RemoteIterator<URI> ri = remote.listBlobIds(filterPrefix);

        return new ClientIterator<URI>(ri, ITERATOR_BATCH_SIZE);
    }

    @Override
    public void sync() throws IOException {
        ensureOpen();
        remote.sync();
    }
}