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package com.qcloud.cos.transfer;

import com.qcloud.cos.event.ProgressListener;
import com.qcloud.cos.exception.CosClientException;
import com.qcloud.cos.exception.CosServiceException;

public interface Transfer {

    /**
     * Enumeration of the possible transfer states.
     */
    public static enum TransferState {
        /** The transfer is waiting for resources to execute and has not started yet. */
        Waiting,

        /** The transfer is actively uploading or downloading and hasn't finished yet. */
        InProgress,

        /** The transfer completed successfully. */
        Completed,

        /** The transfer was canceled and did not complete successfully. */
        Canceled,

        /** The transfer failed. */
        Failed;
    }

    /**
     * Returns whether or not the transfer is finished (i.e. completed successfully, failed, or was
     * canceled).
     *
     * @return Returns true if this transfer is finished (i.e. completed successfully,
     *         failed, or was canceled). Returns false if otherwise.
     */
    public boolean isDone();

    /**
     * Waits for this transfer to complete. This is a blocking call; the current thread is suspended
     * until this transfer completes.
     *
     * @throws CosClientException If any errors were encountered in the client while making the
     *         request or handling the response.
     * @throws CosServiceException If any errors occurred in Qcloud COS while processing the
     *         request.
     * @throws InterruptedException If this thread is interrupted while waiting for the transfer to
     *         complete.
     */
    public void waitForCompletion()
            throws CosClientException, CosServiceException, InterruptedException;

    /**
     * Waits for this transfer to finish and returns any error that occurred, or returns
     * null if no errors occurred. This is a blocking call; the current thread will be
     * suspended until this transfer either fails or completes successfully.
     *
     * @return Any error that occurred while processing this transfer. Otherwise returns
     *         null if no errors occurred.
     *
     * @throws InterruptedException If this thread is interrupted while waiting for the transfer to
     *         complete.
     */
    public CosClientException waitForException() throws InterruptedException;

    /**
     * Returns a human-readable description of this transfer.
     *
     * @return A human-readable description of this transfer.
     */
    public String getDescription();

    /**
     * Returns the current state of this transfer.
     *
     * @return The current state of this transfer.
     */
    public TransferState getState();

    /**
     * Adds the specified progress listener to the list of listeners receiving updates about this
     * transfer's progress.
     *
     * @param listener The progress listener to add.
     */
    public void addProgressListener(ProgressListener listener);

    /**
     * Removes the specified progress listener from the list of progress listeners receiving updates
     * about this transfer's progress.
     *
     * @param listener The progress listener to remove.
     */
    public void removeProgressListener(ProgressListener listener);

    /**
     * Returns progress information about this transfer.
     *
     * @return The progress information about this transfer.
     */
    public TransferProgress getProgress();
}