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// Portions Copyright [2019] Payara Foundation and/or affiliates

package com.sun.enterprise.resource.listener;

/**
 * Pool Life cycle listener that can be implemented by listeners for pool monitoring
 *
 * @author Jagadish Ramu
 */
public interface PoolLifeCycleListener {

    /**
     * Print stack trace in server.log
     * @param stackTrace
     */
    void toString(StringBuilder stackTrace);

    /**
     * indicates that a connection is acquired by application
     */
    void connectionAcquired(long resourceHandleId);

    /**
     * indicates that a connection request is server in the time
     * @param timeTakenInMillis time taken to serve a connection
     */
    void connectionRequestServed(long timeTakenInMillis);

    /**
     * indicates that a connection is timed-out
     */
    void connectionTimedOut();

    /**
     * indicates that a connection under test does not match the current request
     */
    void connectionNotMatched();

    /**
     * indicates that a connection under test matches the current request
     */
    void connectionMatched();

    /**
     * indicates that a connection is being used
     */
    void connectionUsed(long resourceHandleId);

    /**
     * indicates that a connection is destroyed
     */
    void connectionDestroyed(long resourceHandleId);

    /**
     * indicates that a connection is released
     */
    void connectionReleased(long resourceHandleId);

    /**
     * indicates that a new connection is created
     */
    void connectionCreated();

    /**
     * indicates that a potential connection leak happened
     */
    void foundPotentialConnectionLeak();

    /**
     * indicates that a number of connections have failed validation
     * @param count number of connections
     */
    void connectionValidationFailed(int count);

    /**
     * indicates the number of connections freed to pool
     * @param count number of connections
     */
    void connectionsFreed(int count);

    /**
     * indicates that connection count that is used has to be decremented.
     */
    void decrementConnectionUsed(long resourceHandleId);

    /**
     * indicates that free connections count in the pool has to be decremented.
     */
    void decrementNumConnFree();

    /**
     * indicates that a connection is freed and the count is to be incremented.
     * @param beingDestroyed in case of an error.
     * @param steadyPoolSize
     */
    void incrementNumConnFree(boolean beingDestroyed, int steadyPoolSize);

    /**
     * indicates that the wait queue length has increased.
     */
    void connectionRequestQueued();

    /**
     * indicates that the wait queue length has decreased.
     */
    void connectionRequestDequeued();

}