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/*
 * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
 * or more contributor license agreements. Licensed under the Elastic License
 * 2.0 and the Server Side Public License, v 1; you may not use this file except
 * in compliance with, at your election, the Elastic License 2.0 or the Server
 * Side Public License, v 1.
 */

package org.elasticsearch.common.util.concurrent;

import org.elasticsearch.common.metrics.CounterMetric;

import java.util.concurrent.RejectedExecutionHandler;
import java.util.concurrent.ThreadPoolExecutor;

public abstract class EsRejectedExecutionHandler implements RejectedExecutionHandler {

    private final CounterMetric rejected = new CounterMetric();

    /**
     * The number of rejected executions.
     */
    public long rejected() {
        return rejected.count();
    }

    protected void incrementRejections() {
        rejected.inc();
    }

    protected static EsRejectedExecutionException newRejectedException(
        Runnable r,
        ThreadPoolExecutor executor,
        boolean isExecutorShutdown
    ) {
        final StringBuilder builder = new StringBuilder("rejected execution of ").append(r).append(" on ").append(executor);
        if (isExecutorShutdown) {
            builder.append(" (shutdown)");
        }
        return new EsRejectedExecutionException(builder.toString(), isExecutorShutdown);
    }
}