/*
 *  Copyright 2002-2022 Barcelona Supercomputing Center (www.bsc.es)
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *
 */
package es.bsc.compss.types.job;

import es.bsc.compss.log.Loggers;
import es.bsc.compss.types.data.listener.EventListener;
import es.bsc.compss.types.data.operation.DataOperation;

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;


public abstract class JobTransfersListener extends EventListener {

    // Loggers
    private static final Logger LOGGER = LogManager.getLogger(Loggers.FTM_COMP);
    private static final boolean DEBUG = LOGGER.isDebugEnabled();

    private int operation = 0;
    private int errors = 0;
    private boolean enabled = false;


    /**
     * New JobTransfersListener for a given job.
     */
    public JobTransfersListener() {

    }

    /**
     * Activate the transfers listener.
     */
    public void enable() {
        boolean finished;
        boolean failed;
        synchronized (this) {
            this.enabled = true;
            finished = (this.operation == 0);
            failed = (this.errors > 0);
        }
        if (finished) {
            if (failed) {
                stageInFailed(this.errors);
            } else {
                stageInCompleted();
            }
        }
    }

    /**
     * Adds a new operation to the listener.
     */
    public synchronized void addOperation() {
        this.operation++;
    }

    @Override
    public void notifyEnd(DataOperation fOp) {
        boolean enabled;
        boolean finished;
        boolean failed;
        synchronized (this) {
            this.operation--;
            finished = (this.operation == 0);
            failed = this.errors > 0;
            enabled = this.enabled;
        }
        if (finished && enabled) {
            if (failed) {
                stageInFailed(this.errors);
            } else {
                stageInCompleted();
            }
        }
    }

    @Override
    public void notifyFailure(DataOperation fOp, Exception e) {
        String fOpName = "None";
        if (fOp != null) {
            fOpName = fOp.getName();
        }
        if (DEBUG) {
            LOGGER.error("THREAD " + Thread.currentThread().getName() + " File Operation failed on " + fOpName
                + ", file role is JOB_FILE, operation end state is FAILED", e);
        } else {
            LOGGER.error("THREAD " + Thread.currentThread().getName() + " File Operation failed on " + fOpName
                + ", file role is JOB_FILE operation end state is FAILED");
        }

        boolean enabled;
        boolean finished;
        synchronized (this) {
            this.errors++;
            this.operation--;
            finished = this.operation == 0;
            enabled = this.enabled;
        }
        if (enabled && finished) {
            stageInFailed(this.errors);
        }
    }

    public abstract void stageInCompleted();

    public abstract void stageInFailed(int numErrors);

}
