fe/src/main/java/org/apache/doris/common/proc/DbsProcDir.java

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// 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,
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// specific language governing permissions and limitations
// under the License.

package org.apache.doris.common.proc;

import org.apache.doris.catalog.Catalog;
import org.apache.doris.catalog.Database;
import org.apache.doris.common.AnalysisException;
import org.apache.doris.common.Pair;
import org.apache.doris.common.util.DebugUtil;
import org.apache.doris.common.util.ListComparator;
import org.apache.doris.common.util.TimeUtils;

import com.google.common.base.Preconditions;
import com.google.common.base.Strings;
import com.google.common.collect.ImmutableList;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

/*
 * SHOW PROC /dbs/
 * show all dbs' info
 */
public class DbsProcDir implements ProcDirInterface {
    public static final ImmutableList<String> TITLE_NAMES = new ImmutableList.Builder<String>()
            .add("DbId").add("DbName").add("TableNum").add("Quota")
            .add("LastConsistencyCheckTime")
            .build();

    private Catalog catalog;

    public DbsProcDir(Catalog catalog) {
        this.catalog = catalog;
    }

    @Override
    public boolean register(String name, ProcNodeInterface node) {
        // 不支持静态注册，全部都是动态的查看
        return false;
    }

    @Override
    public ProcNodeInterface lookup(String dbIdStr) throws AnalysisException {
        if (catalog == null || Strings.isNullOrEmpty(dbIdStr)) {
            throw new AnalysisException("Db id is null");
        }

        long dbId = -1L;
        try {
            dbId = Long.valueOf(dbIdStr);
        } catch (NumberFormatException e) {
            throw new AnalysisException("Invalid db id format: " + dbIdStr);
        }

        Database db = catalog.getDb(dbId);
        if (db == null) {
            throw new AnalysisException("Database[" + dbId + "] does not exist.");
        }

        return new TablesProcDir(db);
    }

    @Override
    public ProcResult fetchResult() throws AnalysisException {
        Preconditions.checkNotNull(catalog);
        BaseProcResult result = new BaseProcResult();
        result.setNames(TITLE_NAMES);

        List<String> dbNames = catalog.getDbNames();
        if (dbNames == null || dbNames.isEmpty()) {
            // empty
            return result;
        }

        // get info
        List<List<Comparable>> dbInfos = new ArrayList<List<Comparable>>();
        for (String dbName : dbNames) {
            Database db = catalog.getDb(dbName);
            if (db == null) {
                continue;
            }
            List<Comparable> dbInfo = new ArrayList<Comparable>();
            db.readLock();
            try {
                int tableNum = db.getTables().size();
                dbInfo.add(db.getId());
                dbInfo.add(dbName);
                dbInfo.add(tableNum);

                long quota = db.getDataQuota();
                Pair<Double, String> quotaUnitPair = DebugUtil.getByteUint(quota);
                String readableQuota = DebugUtil.DECIMAL_FORMAT_SCALE_3.format(quotaUnitPair.first) + " "
                        + quotaUnitPair.second;
                dbInfo.add(readableQuota);

                dbInfo.add(TimeUtils.longToTimeString(db.getLastCheckTime()));
            } finally {
                db.readUnlock();
            }
            dbInfos.add(dbInfo);
        }

        // order by dbId, asc
        ListComparator<List<Comparable>> comparator = new ListComparator<List<Comparable>>(0);
        Collections.sort(dbInfos, comparator);

        // set result
        for (List<Comparable> info : dbInfos) {
            List<String> row = new ArrayList<String>(info.size());
            for (Comparable comparable : info) {
                row.add(comparable.toString());
            }
            result.addRow(row);
        }
        return result;
    }
}