com.arcadedb.server.ha.message.DatabaseChangeStructureRequest Maven / Gradle / Ivy

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/*
 * Copyright © 2021-present Arcade Data Ltd ([email protected])
 *
 * Licensed 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.
 *
 * SPDX-FileCopyrightText: 2021-present Arcade Data Ltd ([email protected])
 * SPDX-License-Identifier: Apache-2.0
 */
package com.arcadedb.server.ha.message;

import com.arcadedb.database.Binary;
import com.arcadedb.database.DatabaseContext;
import com.arcadedb.database.DatabaseInternal;
import com.arcadedb.engine.ComponentFile;
import com.arcadedb.log.LogManager;
import com.arcadedb.serializer.json.JSONObject;
import com.arcadedb.server.ArcadeDBServer;
import com.arcadedb.server.ha.HAServer;
import com.arcadedb.server.ha.ReplicationException;

import java.io.*;
import java.util.*;
import java.util.logging.*;

public class DatabaseChangeStructureRequest extends HAAbstractCommand {
  private String               databaseName;
  private String               schemaJson;
  private Map filesToAdd;
  private Map filesToRemove;

  public DatabaseChangeStructureRequest() {
  }

  public DatabaseChangeStructureRequest(final String databaseName, final String schemaJson, final Map filesToAdd,
      final Map filesToRemove) {
    this.databaseName = databaseName;
    this.schemaJson = schemaJson;
    this.filesToAdd = filesToAdd;
    this.filesToRemove = filesToRemove;
  }

  @Override
  public void toStream(final Binary stream) {
    stream.putString(databaseName);
    stream.putString(schemaJson);

    stream.putUnsignedNumber(filesToAdd.size());
    for (final Map.Entry file : filesToAdd.entrySet()) {
      stream.putInt(file.getKey());
      stream.putByte((byte) (file.getValue() != null ? 1 : 0));
      if (file.getValue() != null)
        stream.putString(file.getValue());
    }

    stream.putUnsignedNumber(filesToRemove.size());
    for (final Map.Entry file : filesToRemove.entrySet()) {
      stream.putInt(file.getKey());
      stream.putByte((byte) (file.getValue() != null ? 1 : 0));
      if (file.getValue() != null)
        stream.putString(file.getValue());
    }
  }

  @Override
  public void fromStream(final ArcadeDBServer server, final Binary stream) {
    databaseName = stream.getString();
    schemaJson = stream.getString();

    filesToAdd = new HashMap<>();
    int fileCount = (int) stream.getUnsignedNumber();
    for (int i = 0; i < fileCount; ++i) {
      final int fileId = stream.getInt();
      final boolean notNull = stream.getByte() == 1;
      if (notNull)
        filesToAdd.put(fileId, stream.getString());
      else
        filesToAdd.put(fileId, null);
    }

    filesToRemove = new HashMap<>();
    fileCount = (int) stream.getUnsignedNumber();
    for (int i = 0; i < fileCount; ++i) {
      final int fileId = stream.getInt();
      final boolean notNull = stream.getByte() == 1;
      if (notNull)
        filesToRemove.put(fileId, stream.getString());
      else
        filesToRemove.put(fileId, null);
    }
  }

  @Override
  public HACommand execute(final HAServer server, final String remoteServerName, final long messageNumber) {
    try {
      final DatabaseInternal db = server.getServer().getDatabase(databaseName);

      DatabaseContext.INSTANCE.init(db);

      updateFiles(db);

      // RELOAD SCHEMA
      db.getSchema().getEmbedded().load(ComponentFile.MODE.READ_WRITE, true);
      return new DatabaseChangeStructureResponse();

    } catch (final Exception e) {
      LogManager.instance().log(this, Level.SEVERE, "Error on changing database structure request from the leader node", e);
      throw new ReplicationException("Error on changing database structure request from the leader node", e);
    }
  }

  public void updateFiles(final DatabaseInternal db) throws IOException {
    final String databasePath = db.getDatabasePath();

    // ADD FILES
    for (final Map.Entry entry : filesToAdd.entrySet())
      db.getFileManager().getOrCreateFile(entry.getKey(), databasePath + File.separator + entry.getValue());

    // REMOVE FILES
    for (final Map.Entry entry : filesToRemove.entrySet()) {
      db.getPageManager().deleteFile(db, entry.getKey());
      db.getFileManager().dropFile(entry.getKey());
      db.getSchema().getEmbedded().removeFile(entry.getKey());
    }

    if (!schemaJson.isEmpty())
      // REPLACE SCHEMA FILE
      db.getSchema().getEmbedded().update(new JSONObject(schemaJson));
  }

  @Override
  public String toString() {
    return "dbchangestructure add=" + filesToAdd + " remove=" + filesToRemove;
  }
}