org.apache.tajo.engine.planner.physical.PhysicalExec.java Source code

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Here is the source code for org.apache.tajo.engine.planner.physical.PhysicalExec.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.tajo.engine.planner.physical;

import org.apache.commons.logging.Log;
import org.apache.hadoop.fs.Path;
import org.apache.tajo.SessionVars;
import org.apache.tajo.catalog.Schema;
import org.apache.tajo.catalog.SchemaObject;
import org.apache.tajo.catalog.statistics.TableStats;
import org.apache.tajo.engine.codegen.CompilationError;
import org.apache.tajo.storage.Tuple;
import org.apache.tajo.worker.TaskAttemptContext;

import java.io.IOException;
import java.util.UUID;

public abstract class PhysicalExec implements SchemaObject {
    protected final TaskAttemptContext context;
    protected Schema inSchema;
    protected Schema outSchema;
    protected int outColumnNum;

    public PhysicalExec(final TaskAttemptContext context, final Schema inSchema, final Schema outSchema) {
        this.context = context;
        this.inSchema = inSchema;
        this.outSchema = outSchema;
        this.outColumnNum = outSchema.size();
    }

    public final Schema getSchema() {
        return outSchema;
    }

    public void init() throws IOException {
        if (context.getQueryContext().getBool(SessionVars.CODEGEN)) {
            this.compile();
        }
    }

    protected void compile() throws CompilationError {
    }

    public abstract Tuple next() throws IOException;

    public abstract void rescan() throws IOException;

    public abstract void close() throws IOException;

    public abstract float getProgress();

    protected void info(Log log, String message) {
        log.info("[" + context.getTaskId() + "] " + message);
    }

    protected void debug(Log log, String message) {
        log.debug("[" + context.getTaskId() + "] " + message);
    }

    protected void warn(Log log, String message) {
        log.warn("[" + context.getTaskId() + "] " + message);
    }

    protected void fatal(Log log, String message) {
        log.fatal("[" + context.getTaskId() + "] " + message);
    }

    protected Path getExecutorTmpDir() {
        return new Path(context.getTaskId().getTaskId().getExecutionBlockId().getQueryId().toString(),
                UUID.randomUUID().toString());
    }

    public TableStats getInputStats() {
        return null;
    }
}