org.opensafety.hishare.managers.implementation.remoting.PayloadManagerImpl.java Source code

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Here is the source code for org.opensafety.hishare.managers.implementation.remoting.PayloadManagerImpl.java

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/*******************************************************************************
 * Copyright 2011 Pascal Metrics
 * 
 * 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.opensafety.hishare.managers.implementation.remoting;

import java.util.HashMap;
import java.util.Map;
import java.util.UUID;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.opensafety.hishare.dao.interfaces.PayloadDao;
import org.opensafety.hishare.managers.implementation.remoting.helpers.DownloadingPayload;
import org.opensafety.hishare.managers.implementation.remoting.helpers.UploadingPayload;
import org.opensafety.hishare.managers.interfaces.PayloadManager;
import org.opensafety.hishare.model.Parcel;
import org.springframework.beans.factory.annotation.Autowired;

public class PayloadManagerImpl implements PayloadManager {
    public static String createTransferKey() {
        return UUID.randomUUID().toString();
    }

    @Autowired
    PayloadDao payloadDao;

    private Log log = LogFactory.getLog(this.getClass());
    private Map<String, UploadingPayload> uploadingPayloads;

    private Map<String, DownloadingPayload> downloadingPayloads;

    private int chunkSize;

    public PayloadManagerImpl(int chunkSize) {
        this.chunkSize = chunkSize;

        uploadingPayloads = new HashMap<String, UploadingPayload>();
    }

    public String beginDownload(Parcel parcel) {
        String transferKey = createTransferKey();

        byte[] payload = payloadDao.retrievePayload(parcel);

        // keep track of this download
        downloadingPayloads.put(transferKey, new DownloadingPayload(payload));

        // give the user a transfer key to tie them to the object
        return transferKey;
    }

    public String beginUpload() {
        String transferKey = createTransferKey();

        // keep track of this upload
        uploadingPayloads.put(transferKey, new UploadingPayload());

        // give the user a transfer key to tie them to the object
        return transferKey;
    }

    public boolean deletePayload(String payloadLocation) {
        return payloadDao.deletePayload(payloadLocation);
    }

    public boolean downloadAvailable(String transferKey) {
        if (downloadingPayloads.containsKey(transferKey)) {
            return downloadingPayloads.get(transferKey).dataAvailable();
        }
        return false;
    }

    public Integer getChunkSize() {
        return chunkSize;
    }

    public boolean persistPayload(Parcel parcel, byte[] payload) {
        return payloadDao.savePayload(parcel, payload);
    }

    public byte[] resolveUpload(String transferKey) {
        UploadingPayload uploadedPayload = uploadingPayloads.get(transferKey);

        if (uploadedPayload != null) {
            byte[] payload = uploadedPayload.getPayload();

            if (payload != null) {
                uploadingPayloads.remove(transferKey);
            }

            return payload;
        }
        return null;
    }

    public Boolean uploadChunk(String transferKey, byte[] chunk) {
        UploadingPayload uploadingPayload = uploadingPayloads.get(transferKey);

        if (uploadingPayload != null) {
            uploadingPayload.append(chunk);
            return true;
        }
        return false;
    }

    public byte[] downloadPayload(Parcel parcel) {
        // TODO Auto-generated method stub
        return null;
    }
}