org.apache.flink.runtime.query.netty.KvStateClientHandlerTest.java Source code

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Here is the source code for org.apache.flink.runtime.query.netty.KvStateClientHandlerTest.java

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/*
 * 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.flink.runtime.query.netty;

import io.netty.buffer.ByteBuf;
import io.netty.channel.embedded.EmbeddedChannel;
import org.apache.flink.runtime.query.netty.message.KvStateRequestSerializer;
import org.junit.Test;

import java.nio.channels.ClosedChannelException;

import static org.junit.Assert.assertEquals;
import static org.mockito.Matchers.any;
import static org.mockito.Matchers.eq;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.times;
import static org.mockito.Mockito.verify;

public class KvStateClientHandlerTest {

    /**
     * Tests that on reads the expected callback methods are called and read
     * buffers are recycled.
     */
    @Test
    public void testReadCallbacksAndBufferRecycling() throws Exception {
        KvStateClientHandlerCallback callback = mock(KvStateClientHandlerCallback.class);

        EmbeddedChannel channel = new EmbeddedChannel(new KvStateClientHandler(callback));

        //
        // Request success
        //
        ByteBuf buf = KvStateRequestSerializer.serializeKvStateRequestResult(channel.alloc(), 1222112277,
                new byte[0]);
        buf.skipBytes(4); // skip frame length

        // Verify callback
        channel.writeInbound(buf);
        verify(callback, times(1)).onRequestResult(eq(1222112277L), any(byte[].class));
        assertEquals("Buffer not recycled", 0, buf.refCnt());

        //
        // Request failure
        //
        buf = KvStateRequestSerializer.serializeKvStateRequestFailure(channel.alloc(), 1222112278,
                new RuntimeException("Expected test Exception"));
        buf.skipBytes(4); // skip frame length

        // Verify callback
        channel.writeInbound(buf);
        verify(callback, times(1)).onRequestFailure(eq(1222112278L), any(RuntimeException.class));
        assertEquals("Buffer not recycled", 0, buf.refCnt());

        //
        // Server failure
        //
        buf = KvStateRequestSerializer.serializeServerFailure(channel.alloc(),
                new RuntimeException("Expected test Exception"));
        buf.skipBytes(4); // skip frame length

        // Verify callback
        channel.writeInbound(buf);
        verify(callback, times(1)).onFailure(any(RuntimeException.class));

        //
        // Unexpected messages
        //
        buf = channel.alloc().buffer(4).writeInt(1223823);

        // Verify callback
        channel.writeInbound(buf);
        verify(callback, times(2)).onFailure(any(IllegalStateException.class));
        assertEquals("Buffer not recycled", 0, buf.refCnt());

        //
        // Exception caught
        //
        channel.pipeline().fireExceptionCaught(new RuntimeException("Expected test Exception"));
        verify(callback, times(3)).onFailure(any(RuntimeException.class));

        //
        // Channel inactive
        //
        channel.pipeline().fireChannelInactive();
        verify(callback, times(4)).onFailure(any(ClosedChannelException.class));
    }

}