/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 org.apache.ignite.internal.processors.cache;

import java.util.concurrent.Callable;
import java.util.concurrent.CyclicBarrier;
import java.util.concurrent.atomic.AtomicInteger;
import org.apache.ignite.IgniteCache;
import org.apache.ignite.cache.CacheMode;
import org.apache.ignite.cache.store.CacheStore;
import org.apache.ignite.cache.store.CacheStoreAdapter;
import org.apache.ignite.configuration.CacheConfiguration;
import org.apache.ignite.configuration.IgniteConfiguration;
import org.apache.ignite.internal.IgniteInterruptedCheckedException;
import org.apache.ignite.internal.util.typedef.internal.U;
import org.apache.ignite.spi.discovery.tcp.TcpDiscoverySpi;
import org.apache.ignite.spi.discovery.tcp.ipfinder.vm.TcpDiscoveryVmIpFinder;
import org.apache.ignite.testframework.junits.common.GridCommonAbstractTest;
import org.junit.Test;

import static org.apache.ignite.cache.CacheWriteSynchronizationMode.FULL_SYNC;

/**
 * Basic store test.
 */
public abstract class GridCacheBasicStoreMultithreadedAbstractTest extends GridCommonAbstractTest {
    /** */
    private static final long DELAY = 100;

    /** Cache store. */
    private CacheStore<Integer, Integer> store;

    /**
     *
     */
    protected GridCacheBasicStoreMultithreadedAbstractTest() {
        super(false /*start grid. */);
    }

    /** {@inheritDoc} */
    @Override protected void afterTest() throws Exception {
        IgniteCache<?, ?> cache = jcache();

        if (cache != null)
            cache.clear();

        stopAllGrids();
    }

    /**
     * @return Caching mode.
     */
    protected abstract CacheMode cacheMode();

    /** {@inheritDoc} */
    @SuppressWarnings("unchecked")
    @Override protected final IgniteConfiguration getConfiguration(String igniteInstanceName) throws Exception {
        IgniteConfiguration c = super.getConfiguration(igniteInstanceName);

        TcpDiscoverySpi disco = new TcpDiscoverySpi();

        disco.setIpFinder(new TcpDiscoveryVmIpFinder(true));

        c.setDiscoverySpi(disco);

        CacheConfiguration cc = defaultCacheConfiguration();

        cc.setCacheMode(cacheMode());
        cc.setWriteSynchronizationMode(FULL_SYNC);

        cc.setCacheStoreFactory(singletonFactory(store));
        cc.setReadThrough(true);
        cc.setWriteThrough(true);
        cc.setLoadPreviousValue(true);

        c.setCacheConfiguration(cc);

        return c;
    }

    /**
     * @throws Exception If failed.
     */
    @Test
    public void testConcurrentGet() throws Exception {
        final AtomicInteger cntr = new AtomicInteger();

        store = new CacheStoreAdapter<Integer, Integer>() {
            @Override public Integer load(Integer key) {
                int res = cntr.incrementAndGet();

                try {
                    U.sleep(DELAY);
                }
                catch (IgniteInterruptedCheckedException e) {
                    e.printStackTrace();

                    Thread.currentThread().interrupt();
                }

                cntr.decrementAndGet();

                return res;
            }

            /** {@inheritDoc} */
            @Override public void write(javax.cache.Cache.Entry<? extends Integer, ? extends Integer> e) {
                assert false;
            }

            /** {@inheritDoc} */
            @Override public void delete(Object key) {
                assert false;
            }
        };

        startGrid();

        final IgniteCache<Integer, Integer> cache = jcache();

        int threads = 2;

        final CyclicBarrier barrier = new CyclicBarrier(threads);

        multithreaded(new Callable<Object>() {
            @Override public Object call() throws Exception {
                barrier.await();

                assertEquals(1, (int)cache.get(1));

                return null;
            }
        }, threads, "concurrent-get-worker");

        assertEquals(0, cntr.get());
    }
}