/*
 * Copyright (c) 2016 Cisco Systems, Inc. and others.  All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v1.0 which accompanies this distribution,
 * and is available at http://www.eclipse.org/legal/epl-v10.html
 */
package org.opendaylight.controller.cluster.access.client;

import com.google.common.annotations.Beta;
import java.util.Optional;
import org.opendaylight.controller.cluster.access.concepts.RequestException;

@Beta
public final class ConnectingClientConnection<T extends BackendInfo> extends AbstractClientConnection<T> {
    /**
     * A wild estimate on how deep a queue should be. Without having knowledge of the remote actor we can only
     * guess its processing capabilities while we are doing initial buffering. With {@link AveragingProgressTracker}
     * this boils down to a burst of up to 2000 messages before we start throttling.
     */
    private static final int TARGET_QUEUE_DEPTH = 4000;

    // Initial state, never instantiated externally
    ConnectingClientConnection(final ClientActorContext context, final Long cookie) {
        super(context, cookie, new TransmitQueue.Halted(TARGET_QUEUE_DEPTH));
    }

    @Override
    public Optional<T> getBackendInfo() {
        return Optional.empty();
    }

    @Override
    long backendSilentTicks(final long now) {
        // We are still connecting and do not want the timer to attempt a reconnect
        return 0;
    }

    @Override
    ClientActorBehavior<T> lockedReconnect(final ClientActorBehavior<T> current, final RequestException cause) {
        throw new UnsupportedOperationException("Attempted to reconnect a connecting connection", cause);
    }
}