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package org.openslx.imagemaster.serverconnection;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicLong;
public abstract class AbstractTransfer {
/**
* How long to keep this transfer information when the transfer is
* (potentially) done
*/
private static final long FINISH_TIMEOUT = TimeUnit.MINUTES.toMillis(5);
/**
* How long to keep this transfer information when there are no active
* connections and the transfer seems unfinished
*/
private static final long IDLE_TIMEOUT = TimeUnit.HOURS.toMillis(4);
/**
* Time stamp of when (we think) the transfer finished. Clients can/might
* not tell us they're done, and simply taking "no active connection" as a
* sign the download is done might have unwanted effects if the user's
* connection drops for a minute. If this time stamp (plus a FINISH_TIMEOUT)
* passed,
* we consider the download done and flag it for removal.
* If set to zero, the transfer is not finished, or not assumed to have
* finished.
*/
protected final AtomicLong potentialFinishTime = new AtomicLong(0);
/**
* Time of last activity on this transfer.
*/
protected final AtomicLong lastActivityTime = new AtomicLong(System.currentTimeMillis());
private final String transferId;
public AbstractTransfer(String transferId) {
this.transferId = transferId;
}
/**
* Returns true if the transfer is considered completed.
*
* @param now pass System.currentTimeMillis()
* @return true if the transfer is considered completed
*/
public boolean isComplete(long now) {
long val = potentialFinishTime.get();
return val != 0 && val + FINISH_TIMEOUT < now;
}
/**
* Returns true if there has been no activity on this transfer for a certain
* amount of time.
*
* @param now pass System.currentTimeMillis()
* @return true if the transfer reached its idle timeout
*/
public final boolean hasReachedIdleTimeout(long now) {
return getActiveConnectionCount() == 0 && lastActivityTime.get() + IDLE_TIMEOUT < now;
}
public final String getId() {
return transferId;
}
/**
* Returns true if this transfer would potentially accept new connections.
* This should NOT return false if there are too many concurrent
* connections, as this is used to signal the client whether to keep trying
* to connect.
*
* @return true if this transfer would potentially accept new connections
*/
public abstract boolean isActive();
/**
* Cancel this transfer, aborting all active connections and rejecting
* further incoming ones.
*/
public abstract void cancel();
/**
* Returns number of active transfer connections.
*
* @return number of active transfer connections
*/
public abstract int getActiveConnectionCount();
}
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