/*
 * 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.HashMap;
import java.util.List;
import java.util.Map;
import org.apache.ignite.Ignite;
import org.apache.ignite.IgniteCompute;
import org.apache.ignite.IgniteException;
import org.apache.ignite.cluster.ClusterNode;
import org.apache.ignite.compute.ComputeJob;
import org.apache.ignite.compute.ComputeJobResult;
import org.apache.ignite.compute.ComputeJobResultPolicy;
import org.apache.ignite.compute.ComputeTask;
import org.apache.ignite.compute.ComputeTaskFuture;
import org.apache.ignite.testframework.junits.common.GridCommonAbstractTest;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import org.junit.Test;

/**
 * Testing that if {@link ComputeTask#result(ComputeJobResult, List)} throws an {@link IgniteException}
 * then that exception is thrown as the execution result.
 */
public class IgniteComputeResultExceptionTest extends GridCommonAbstractTest {
    /** */
    @Test
    public void testIgniteExceptionExecute() throws Exception {
        checkExecuteException(new IgniteException());
    }

    /** */
    @Test
    public void testIgniteExceptionWithCauseExecute() throws Exception {
        checkExecuteException(new IgniteException(new Exception()));
    }

    /** */
    @Test
    public void testIgniteExceptionWithCauseChainExecute() throws Exception {
        checkExecuteException(new IgniteException(new Exception(new Throwable())));
    }

    /** */
    @Test
    public void testCustomExceptionExecute() throws Exception {
        checkExecuteException(new TaskException());
    }

    /** */
    @Test
    public void testCustomExceptionWithCauseExecute() throws Exception {
        checkExecuteException(new TaskException(new Exception()));
    }

    /** */
    @Test
    public void testCustomExceptionWithCauseChainExecute() throws Exception {
        checkExecuteException(new TaskException(new Exception(new Throwable())));
    }

    /** */
    private void checkExecuteException(IgniteException resE) throws Exception {
        try (Ignite ignite = startGrid()) {
            IgniteCompute compute = ignite.compute();
            try {
                compute.execute(new ResultExceptionTask(resE), null);
            }
            catch (IgniteException e) {
                assertSame(resE, e);
            }
        }
    }

    /** */
    @Test
    public void testIgniteExceptionExecuteAsync() throws Exception {
        checkExecuteAsyncException(new IgniteException());
    }

    /** */
    @Test
    public void testIgniteExceptionWithCauseExecuteAsync() throws Exception {
        checkExecuteAsyncException(new IgniteException(new Exception()));
    }

    /** */
    @Test
    public void testIgniteExceptionWithCauseChainExecuteAsync() throws Exception {
        checkExecuteAsyncException(new IgniteException(new Exception(new Throwable())));
    }


    /** */
    @Test
    public void testCustomExceptionExecuteAsync() throws Exception {
        checkExecuteAsyncException(new TaskException());
    }

    /** */
    @Test
    public void testCustomExceptionWithCauseExecuteAsync() throws Exception {
        checkExecuteAsyncException(new TaskException(new Exception()));
    }

    /** */
    @Test
    public void testCustomExceptionWithCauseChainExecuteAsync() throws Exception {
        checkExecuteAsyncException(new TaskException(new Exception(new Throwable())));
    }

    /** */
    private void checkExecuteAsyncException(IgniteException resE) throws Exception {
        try (Ignite ignite = startGrid()) {
            IgniteCompute compute = ignite.compute();
            ComputeTaskFuture<Object> fut = compute.executeAsync(new ResultExceptionTask(resE), null);
            try {
                fut.get();
            }
            catch (IgniteException e) {
                assertSame(resE, e);
            }
        }
    }

    /** */
    private static class TaskException extends IgniteException {
        /** */
        public TaskException() {
            // No-op.
        }

        /** */
        public TaskException(Throwable cause) {
            super(cause);
        }
    }

    /** */
    private static class NoopJob implements ComputeJob {
        /** */
        @Override public void cancel() {
            // No-op.
        }

        /** */
        @Override public Object execute() throws IgniteException {
            return null;
        }
    }

    /** */
    private static class ResultExceptionTask implements ComputeTask<Object, Object> {
        /** */
        private final IgniteException resE;

        /**
         * @param resE Exception to be rethrown by the
         */
        ResultExceptionTask(IgniteException resE) {
            this.resE = resE;
        }

        /** */
        @NotNull @Override public Map<? extends ComputeJob, ClusterNode> map(List<ClusterNode> subgrid,
            @Nullable Object arg) throws IgniteException {
            Map<ComputeJob, ClusterNode> jobs = new HashMap<>();

            for (ClusterNode node : subgrid)
                jobs.put(new NoopJob(), node);

            return jobs;
        }

        /** */
        @Override public ComputeJobResultPolicy result(ComputeJobResult res, List<ComputeJobResult> rcvd)
            throws IgniteException {
            throw resE;
        }

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