com.cloudera.livy.rsc.driver.Statement.java Source code

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Here is the source code for com.cloudera.livy.rsc.driver.Statement.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 com.cloudera.livy.rsc.driver;

import java.util.concurrent.atomic.AtomicReference;

import com.fasterxml.jackson.annotation.JsonRawValue;

public class Statement {
    public final Integer id;
    public final AtomicReference<StatementState> state;
    @JsonRawValue
    public volatile String output;
    public double progress;

    public Statement(Integer id, StatementState state, String output) {
        this.id = id;
        this.state = new AtomicReference<>(state);
        this.output = output;
        this.progress = 0.0;
    }

    public Statement() {
        this(null, null, null);
    }

    public boolean compareAndTransit(final StatementState from, final StatementState to) {
        if (state.compareAndSet(from, to)) {
            StatementState.validate(from, to);
            return true;
        }
        return false;
    }

    public void updateProgress(double p) {
        if (this.state.get().isOneOf(StatementState.Cancelled, StatementState.Available)) {
            this.progress = 1.0;
        } else {
            this.progress = p;
        }
    }
}