org.apache.tajo.QueryId.java Source code

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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;

import org.apache.hadoop.yarn.api.records.ApplicationId;
import org.apache.hadoop.yarn.api.records.impl.pb.ApplicationIdPBImpl;
import org.apache.hadoop.yarn.proto.YarnProtos.ApplicationAttemptIdProto;
import org.apache.hadoop.yarn.proto.YarnProtos.ApplicationAttemptIdProtoOrBuilder;
import org.apache.hadoop.yarn.proto.YarnProtos.ApplicationIdProto;

import java.text.NumberFormat;

/**
 * QueryId represents a unique identifier of a query.
 */
public class QueryId implements Comparable<QueryId> {
    public static final String PREFIX = "q";
    public static final String SEPARATOR = "_";

    ApplicationAttemptIdProto proto = ApplicationAttemptIdProto.getDefaultInstance();
    ApplicationAttemptIdProto.Builder builder = null;
    boolean viaProto = false;

    private ApplicationId applicationId = null;

    public QueryId() {
        builder = ApplicationAttemptIdProto.newBuilder();
    }

    public QueryId(ApplicationAttemptIdProto proto) {
        this.proto = proto;
        viaProto = true;
    }

    public synchronized ApplicationAttemptIdProto getProto() {
        mergeLocalToProto();
        proto = viaProto ? proto : builder.build();
        viaProto = true;
        return proto;
    }

    private synchronized void mergeLocalToBuilder() {
        if (this.applicationId != null
                && !((ApplicationIdPBImpl) applicationId).getProto().equals(builder.getApplicationId())) {
            builder.setApplicationId(convertToProtoFormat(this.applicationId));
        }
    }

    private synchronized void mergeLocalToProto() {
        if (viaProto)
            maybeInitBuilder();
        mergeLocalToBuilder();
        proto = builder.build();
        viaProto = true;
    }

    private synchronized void maybeInitBuilder() {
        if (viaProto || builder == null) {
            builder = ApplicationAttemptIdProto.newBuilder(proto);
        }
        viaProto = false;
    }

    public synchronized int getAttemptId() {
        ApplicationAttemptIdProtoOrBuilder p = viaProto ? proto : builder;
        return (p.getAttemptId());
    }

    public synchronized void setAttemptId(int attemptId) {
        maybeInitBuilder();
        builder.setAttemptId((attemptId));
    }

    public synchronized ApplicationId getApplicationId() {
        ApplicationAttemptIdProtoOrBuilder p = viaProto ? proto : builder;
        if (this.applicationId != null) {
            return this.applicationId;
        }
        if (!p.hasApplicationId()) {
            return null;
        }
        this.applicationId = convertFromProtoFormat(p.getApplicationId());
        return this.applicationId;
    }

    public synchronized void setApplicationId(ApplicationId appId) {
        maybeInitBuilder();
        if (appId == null)
            builder.clearApplicationId();
        this.applicationId = appId;
    }

    private ApplicationIdPBImpl convertFromProtoFormat(ApplicationIdProto p) {
        return new ApplicationIdPBImpl(p);
    }

    private ApplicationIdProto convertToProtoFormat(ApplicationId t) {
        return ((ApplicationIdPBImpl) t).getProto();
    }

    @Override
    public int compareTo(QueryId queryId) {
        int compVal = getApplicationId().compareTo(queryId.getApplicationId());
        if (compVal != 0) {
            return compVal;
        } else {
            return getAttemptId() - queryId.getAttemptId();
        }
    }

    static final ThreadLocal<NumberFormat> appIdFormat = new ThreadLocal<NumberFormat>() {
        @Override
        public NumberFormat initialValue() {
            NumberFormat fmt = NumberFormat.getInstance();
            fmt.setGroupingUsed(false);
            fmt.setMinimumIntegerDigits(4);
            return fmt;
        }
    };

    static final ThreadLocal<NumberFormat> attemptIdFormat = new ThreadLocal<NumberFormat>() {
        @Override
        public NumberFormat initialValue() {
            NumberFormat fmt = NumberFormat.getInstance();
            fmt.setGroupingUsed(false);
            fmt.setMinimumIntegerDigits(6);
            return fmt;
        }
    };

    @Override
    public int hashCode() {
        // Generated by eclipse.
        final int prime = 31;
        int result = 1;
        ApplicationId appId = getApplicationId();
        result = prime * result + appId.hashCode();
        result = prime * result + getAttemptId();
        return result;
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj)
            return true;
        if (obj == null)
            return false;
        if (getClass() != obj.getClass())
            return false;
        QueryId other = (QueryId) obj;
        if (!this.getApplicationId().equals(other.getApplicationId()))
            return false;
        if (this.getAttemptId() != other.getAttemptId())
            return false;
        return true;
    }

    @Override
    public String toString() {
        StringBuilder sb = new StringBuilder(PREFIX).append(SEPARATOR)
                .append(this.getApplicationId().getClusterTimestamp()).append(SEPARATOR)
                .append(appIdFormat.get().format(this.getApplicationId().getId())).append(SEPARATOR)
                .append(attemptIdFormat.get().format(getAttemptId()));
        return sb.toString();
    }
}