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//
// ========================================================================
// Copyright (c) 1995 Mort Bay Consulting Pty Ltd and others.
//
// This program and the accompanying materials are made available under the
// terms of the Eclipse Public License v. 2.0 which is available at
// https://www.eclipse.org/legal/epl-2.0, or the Apache License, Version 2.0
// which is available at https://www.apache.org/licenses/LICENSE-2.0.
//
// SPDX-License-Identifier: EPL-2.0 OR Apache-2.0
// ========================================================================
//

package org.eclipse.jetty.io.internal;

import java.util.ArrayList;
import java.util.Collection;
import java.util.stream.Stream;

import org.eclipse.jetty.util.Pool;

/**
 * A {@link Pool} implementation that uses a primary pool which overflows to a secondary pool.
 *
 * @param  the type of the pooled objects
 */
public class CompoundPool
 implements Pool

{
    private final Pool
 primaryPool;
    private final Pool
 secondaryPool;

    public CompoundPool(Pool
 primaryPool, Pool
 secondaryPool)
    {
        this.primaryPool = primaryPool;
        this.secondaryPool = secondaryPool;
    }

    @Override
    public Entry
 reserve()
    {
        Entry
 primary = primaryPool.reserve();
        return primary != null ? primary : secondaryPool.reserve();
    }

    @Override
    public Entry
 acquire()
    {
        Entry primary = primaryPool.acquire();
        return primary != null ? primary : secondaryPool.acquire();
    }

    @Override
    public boolean isTerminated()
    {
        return primaryPool.isTerminated();
    }

    @Override
    public Collection> terminate()
    {
        Collection> entries = new ArrayList<>();
        entries.addAll(primaryPool.terminate());
        entries.addAll(secondaryPool.terminate());
        return entries;
    }

    @Override
    public int size()
    {
        return primaryPool.size() + secondaryPool.size();
    }

    @Override
    public int getMaxSize()
    {
        return primaryPool.getMaxSize() + secondaryPool.getMaxSize();
    }

    @Override
    public Stream> stream()
    {
        return Stream.concat(primaryPool.stream(), secondaryPool.stream());
    }
}