org.apache.lens.server.query.LensPersistentResult.java Source code

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Here is the source code for org.apache.lens.server.query.LensPersistentResult.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.lens.server.query;

import java.io.IOException;

import org.apache.lens.api.query.QueryHandle;
import org.apache.lens.server.api.LensConfConstants;
import org.apache.lens.server.api.driver.LensResultSetMetadata;
import org.apache.lens.server.api.driver.PersistentResultSet;
import org.apache.lens.server.api.error.LensException;
import org.apache.lens.server.api.query.FinishedLensQuery;
import org.apache.lens.server.api.query.QueryContext;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;

import lombok.Getter;
import lombok.extern.slf4j.Slf4j;

/** The Class LensPersistentResult. */
@Slf4j
public class LensPersistentResult extends PersistentResultSet {

    /** The metadata. */
    private final LensResultSetMetadata metadata;

    /** The output path. */
    private final String outputPath;

    /** The num rows. */
    private final Integer numRows;

    /** The file size. */
    private final Long fileSize;
    private final Configuration conf;
    @Getter
    private String httpResultUrl = null;

    /**
     * Instantiates a new lens persistent result.
     *  @param queryHandle the query handle
     * @param metadata    the metadata
     * @param outputPath  the output path
     * @param numRows     the num rows
     * @param conf        the lens server conf
     */
    public LensPersistentResult(QueryHandle queryHandle, LensResultSetMetadata metadata, String outputPath,
            Integer numRows, Long fileSize, Configuration conf) {
        this.metadata = metadata;
        this.outputPath = outputPath;
        this.numRows = numRows;
        this.fileSize = fileSize;
        this.conf = conf;
        if (isHttpResultAvailable()) {
            this.httpResultUrl = conf.get(LensConfConstants.SERVER_BASE_URL,
                    LensConfConstants.DEFAULT_SERVER_BASE_URL) + "queryapi/queries/" + queryHandle
                    + "/httpresultset";
        }
    }

    public LensPersistentResult(QueryContext ctx, Configuration conf) {
        this(ctx.getQueryHandle(), ctx.getQueryOutputFormatter().getMetadata(),
                ctx.getQueryOutputFormatter().getFinalOutputPath(), ctx.getQueryOutputFormatter().getNumRows(),
                ctx.getQueryOutputFormatter().getFileSize(), conf);
    }

    public LensPersistentResult(FinishedLensQuery query, Configuration conf)
            throws ClassNotFoundException, IOException {
        this(QueryHandle.fromString(query.getHandle()), LensResultSetMetadata.fromJson(query.getMetadata()),
                query.getResult(), query.getRows(), query.getFileSize(), conf);
    }

    @Override
    public String getOutputPath() throws LensException {
        return outputPath;
    }

    /*
     * (non-Javadoc)
     *
     * @see org.apache.lens.server.api.driver.LensResultSet#size()
     */
    @Override
    public Integer size() throws LensException {
        return numRows;
    }

    @Override
    public Long getFileSize() throws LensException {
        return fileSize;
    }

    @Override
    public LensResultSetMetadata getMetadata() throws LensException {
        return metadata;
    }

    @Override
    public boolean isHttpResultAvailable() {
        try {
            final Path resultPath = new Path(getOutputPath());
            FileSystem fs = resultPath.getFileSystem(conf);
            if (fs.isDirectory(resultPath)) {
                return false;
            }
        } catch (IOException | LensException e) {
            log.warn("Unable to get status for Result Directory", e);
            return false;
        }
        return true;
    }
}