org.springframework.data.hadoop.store.split.AbstractSplitterTests.java Source code

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Here is the source code for org.springframework.data.hadoop.store.split.AbstractSplitterTests.java

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/*
 * Copyright 2014 the original author or authors.
 *
 * Licensed 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.springframework.data.hadoop.store.split;

import static org.mockito.Matchers.any;
import static org.mockito.Matchers.anyLong;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.when;

import java.util.ArrayList;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.BlockLocation;
import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.mockito.invocation.InvocationOnMock;
import org.mockito.stubbing.Answer;

/**
 * Base class for all splitter tests having a shared
 * mocking systems to isolate splitter functionality
 * from a real file system.
 *
 * @author Janne Valkealahti
 *
 */
public abstract class AbstractSplitterTests {

    protected final static Configuration CONFIGURATION = new Configuration();

    protected static Path mockWithFileSystem(int blockCount, long blockSize) throws Exception {
        return mockWithFileSystem(blockCount, blockSize, 0);
    }

    protected static Path mockWithFileSystem(int blockCount, long blockSize, long extraBlockSize) throws Exception {
        final ArrayList<BlockLocation> blocks = new ArrayList<BlockLocation>();
        long offset = 0;
        int i = 0;
        for (; i < blockCount; i++) {
            blocks.add(new BlockLocation(new String[] { "names" + i }, new String[] { "hosts" + i }, offset,
                    blockSize));
            offset += blockSize;
        }

        // extra just means that we add a non full last block
        if (extraBlockSize > 0 && extraBlockSize < blockSize) {
            blocks.add(new BlockLocation(new String[] { "names" + i }, new String[] { "hosts" + i }, offset,
                    extraBlockSize));
            offset += extraBlockSize;
        }

        FileStatus mStatus = mock(FileStatus.class);
        Path mPath = mock(Path.class);
        FileSystem mFs = mock(FileSystem.class);
        when(mStatus.getLen()).thenReturn(offset);
        when(mStatus.getBlockSize()).thenReturn(blockSize);
        when(mFs.getFileStatus(mPath)).thenReturn(mStatus);

        when(mFs.getFileBlockLocations((FileStatus) any(), anyLong(), anyLong()))
                .thenAnswer(new Answer<BlockLocation[]>() {

                    @Override
                    public BlockLocation[] answer(InvocationOnMock invocation) throws Throwable {
                        Object[] arguments = invocation.getArguments();
                        return findBlocks(blocks, (Long) arguments[1], (Long) arguments[2]);
                    }
                });

        when(mPath.getFileSystem((Configuration) any())).thenReturn(mFs);
        return mPath;
    }

    protected static BlockLocation[] findBlocks(ArrayList<BlockLocation> blocks, long start, long length) {
        final ArrayList<BlockLocation> ret = new ArrayList<BlockLocation>();
        for (BlockLocation block : blocks) {
            if (!((start >= (block.getOffset() + block.getLength())) && ((start + length) <= block.getOffset()))) {
                ret.add(block);
            }
        }
        return ret.toArray(new BlockLocation[0]);
    }

}