package org.onosproject.net.resource;

import java.util.Collection;
import java.util.Set;

import org.onosproject.net.DeviceId;

import com.google.common.collect.Multimap;

/**
 * Service for providing label resource allocation.
 */
public interface LabelResourceService {

    /**
     * Returns labels from resource pool by a specific device id.
     *
     * @param deviceId device identifier
     * @param applyNum the applying number
     * @return collection of applying labels
     */
    Collection<LabelResource> applyFromDevicePool(DeviceId deviceId,
                                                  long applyNum);

    /**
     * Returns labels from the global label resource pool.
     *
     * @param applyNum the applying number
     * @return collection of applying labels
     */
    Collection<LabelResource> applyFromGlobalPool(long applyNum);

    /**
     * Releases unused labels to device pools .
     *
     * @param release the collection of releasing labels
     * @return success or fail
     */
    boolean releaseToDevicePool(Multimap<DeviceId, LabelResource> release);

    /**
     * Releases unused labels to the global resource pool.
     *
     * @param release release the collection of releasing labels
     * @return success or fail
     */
    boolean releaseToGlobalPool(Set<LabelResourceId> release);

    /**
     * Judges if the pool of a specific device id is full.
     *
     * @param deviceId device identifier
     * @return yes or no
     */
    boolean isDevicePoolFull(DeviceId deviceId);

    /**
     * Judges if the global resource pool is full.
     *
     * @return yes or no
     */
    boolean isGlobalPoolFull();

    /**
     * Returns the unused label number of a label resource pool by a specific device
     * id.
     *
     * @param deviceId device identifier
     * @return number of unused labels
     */
    long getFreeNumOfDevicePool(DeviceId deviceId);

    /**
     * Returns the unused label number of a global label resource pool.
     *
     * @return number of unused labels
     */
    long getFreeNumOfGlobalPool();

    /**
     * Returns the label resource pool of a label resource by a specific device
     * id.
     *
     * @param deviceId device identifier
     * @return the device label resource pool
     */
    LabelResourcePool getDeviceLabelResourcePool(DeviceId deviceId);

    /**
     * Returns the global label resource pool.
     *
     * @return the global label resource pool
     */
    LabelResourcePool getGlobalLabelResourcePool();

    /**
     * Adds the specified label resource listener.
     *
     * @param listener label resource listener
     */
    void addListener(LabelResourceListener listener);

    /**
     * Removes the specified label resource listener.
     *
     * @param listener label resource listener
     */
    void removeListener(LabelResourceListener listener);
}