/*
 * 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;

import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.concurrent.atomic.AtomicInteger;
import org.apache.ignite.Ignite;
import org.apache.ignite.cluster.ClusterNode;
import org.apache.ignite.compute.ComputeJob;
import org.apache.ignite.compute.ComputeJobAdapter;
import org.apache.ignite.compute.ComputeJobResult;
import org.apache.ignite.compute.ComputeTaskAdapter;
import org.apache.ignite.compute.ComputeTaskSession;
import org.apache.ignite.compute.ComputeTaskSessionFullSupport;
import org.apache.ignite.configuration.IgniteConfiguration;
import org.apache.ignite.resources.TaskSessionResource;
import org.apache.ignite.spi.IgniteSpiAdapter;
import org.apache.ignite.spi.IgniteSpiException;
import org.apache.ignite.spi.IgniteSpiMultipleInstancesSupport;
import org.apache.ignite.spi.checkpoint.CheckpointListener;
import org.apache.ignite.spi.checkpoint.CheckpointSpi;
import org.apache.ignite.testframework.junits.common.GridCommonAbstractTest;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import org.junit.Test;

/**
 * Test for checkpoint cleanup.
 */
public class GridJobCheckpointCleanupSelfTest extends GridCommonAbstractTest {
    /** Number of currently alive checkpoints. */
    private final AtomicInteger cntr = new AtomicInteger();

    /** Checkpoint. */
    private CheckpointSpi checkpointSpi;

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

        c.setCheckpointSpi(checkpointSpi);

        return c;
    }

    /**
     * Spawns one job on the node other than task node and
     * ensures that all checkpoints were removed after task completion.
     *
     * @throws Exception if failed.
     */
    @Test
    public void testCheckpointCleanup() throws Exception {
        try {
            checkpointSpi = new TestCheckpointSpi("task-checkpoints", cntr);

            Ignite taskIgnite = startGrid(0);

            checkpointSpi = new TestCheckpointSpi("job-checkpoints", cntr);

            Ignite jobIgnite = startGrid(1);

            taskIgnite.compute().execute(new CheckpointCountingTestTask(), jobIgnite.cluster().localNode());
        }
        finally {
            stopAllGrids();
        }

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

    /**
     * Test checkpoint SPI.
     */
    @IgniteSpiMultipleInstancesSupport(true)
    private static class TestCheckpointSpi extends IgniteSpiAdapter implements CheckpointSpi {
        /** Counter. */
        private final AtomicInteger cntr;

        /**
         * @param name Name.
         * @param cntr Counter.
         */
        TestCheckpointSpi(String name, AtomicInteger cntr) {
            setName(name);

            this.cntr = cntr;
        }

        /** {@inheritDoc} */
        @Override public byte[] loadCheckpoint(String key) throws IgniteSpiException {
            return null;
        }

        /** {@inheritDoc} */
        @Override public boolean saveCheckpoint(String key, byte[] state, long timeout, boolean overwrite)
            throws IgniteSpiException {
            cntr.incrementAndGet();

            return true;
        }

        /** {@inheritDoc} */
        @Override public boolean removeCheckpoint(String key) {
            cntr.decrementAndGet();

            return true;
        }

        /** {@inheritDoc} */
        @Override public void setCheckpointListener(CheckpointListener lsnr) {
            // No-op.
        }

        /** {@inheritDoc} */
        @Override public void spiStart(@Nullable String igniteInstanceName) throws IgniteSpiException {
            // No-op.
        }

        /** {@inheritDoc} */
        @Override public void spiStop() throws IgniteSpiException {
            // No-op.
        }
    }

    /**
     *
     */
    @ComputeTaskSessionFullSupport
    private static class CheckpointCountingTestTask extends ComputeTaskAdapter<ClusterNode, Object> {
        /** {@inheritDoc} */
        @NotNull @Override public Map<? extends ComputeJob, ClusterNode> map(List<ClusterNode> subgrid, @Nullable ClusterNode arg) {
            for (ClusterNode node : subgrid) {
                if (node.id().equals(arg.id()))
                    return Collections.singletonMap(new ComputeJobAdapter() {
                        @TaskSessionResource
                        private ComputeTaskSession ses;

                        @Nullable @Override public Object execute() {
                            ses.saveCheckpoint("checkpoint-key", "checkpoint-value");

                            return null;
                        }
                    }, node);
            }

            assert false : "Expected node wasn't found in grid";

            // Never accessible.
            return null;
        }

        /** {@inheritDoc} */
        @Override public Object reduce(List<ComputeJobResult> results) {
            return null;
        }
    }
}