com.pivotal.gemfirexd.internal.engine.diag.SysPoliciesVTI Maven / Gradle / Ivy

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/*
 * Copyright (c) 2017-2019 TIBCO Software Inc. All rights reserved.
 *
 * 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. See accompanying
 * LICENSE file.
 */

package com.pivotal.gemfirexd.internal.engine.diag;

import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import java.sql.Types;
import java.util.Collections;
import java.util.Iterator;

import com.gemstone.gemfire.internal.cache.PolicyTableData;
import com.pivotal.gemfirexd.internal.catalog.ExternalCatalog;
import com.pivotal.gemfirexd.internal.engine.GfxdVTITemplate;
import com.pivotal.gemfirexd.internal.engine.GfxdVTITemplateNoAllNodesRoute;
import com.pivotal.gemfirexd.internal.engine.Misc;
import com.pivotal.gemfirexd.internal.engine.jdbc.GemFireXDRuntimeException;
import com.pivotal.gemfirexd.internal.iapi.sql.ResultColumnDescriptor;
import com.pivotal.gemfirexd.internal.impl.jdbc.EmbedResultSetMetaData;
import com.pivotal.gemfirexd.internal.impl.sql.catalog.GfxdDataDictionary;
import com.pivotal.gemfirexd.internal.shared.common.SharedUtils;
import com.pivotal.gemfirexd.internal.shared.common.reference.Limits;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * A virtual table that shows the policy details
 */
public class SysPoliciesVTI extends GfxdVTITemplate
    implements GfxdVTITemplateNoAllNodesRoute {

  private final Logger logger = LoggerFactory.getLogger(getClass().getName());

  private Iterator policyDatas;
  private PolicyTableData currentPolicyMeta;

  @Override
  public ResultSetMetaData getMetaData() throws SQLException {
    return metadata;
  }

  @Override
  public boolean next() {
    if (this.policyDatas == null) {
      final ExternalCatalog hiveCatalog;
      if (!GfxdDataDictionary.SKIP_CATALOG_OPS.get().skipHiveCatalogCalls &&
          (hiveCatalog = Misc.getMemStore().getExternalCatalog()) != null) {
        try {
          this.policyDatas = hiveCatalog.getPolicies().iterator();
        } catch (Exception e) {
          // log and move on
          logger.warn("ERROR in retrieving Policies : " + e.toString());
          this.policyDatas = Collections.emptyIterator();
        }
      } else {
        this.policyDatas = Collections.emptyIterator();
      }
    }
    if (this.policyDatas.hasNext()) {
      this.currentPolicyMeta = this.policyDatas.next();
      return true;
    } else {
      this.currentPolicyMeta = null;
      return false;
    }
  }

  @Override
  protected Object getObjectForColumn(int columnNumber) {
    switch (columnNumber) {
      case 1: // Policy Name
        return SharedUtils.SQLToUpperCase(this.currentPolicyMeta.policyName);
      case 2: // TABLE SCHEMA NAME
        return SharedUtils.SQLToUpperCase(this.currentPolicyMeta.schemaName);
      case 3: // TABLE
        return SharedUtils.SQLToUpperCase(this.currentPolicyMeta.tableName);
      case 4: // For
        return this.currentPolicyMeta.policyFor;
      case 5: // Apply To
        return this.currentPolicyMeta.policyApplyTo;
      case 6: // filter
        return this.currentPolicyMeta.filter;
      case 7: //owner
        return this.currentPolicyMeta.owner;
      default:
        throw new GemFireXDRuntimeException("unexpected column=" +
            columnNumber + " for HiveTablesVTI");
    }
  }

  /**
   * Metadata
   */

  private static final String POLICYNAME = "NAME";
  private static final String SCHEMANAME = "SCHEMANAME";
  private static final String TABLE = "TABLENAME";
  private static final String FOR = "POLICYFOR";
  private static final String APPLYTO = "APPLYTO";
  private static final String FILTER = "FILTER";
  private static final String OWNER = "OWNER";

  private static final ResultColumnDescriptor[] columnInfo = {
      EmbedResultSetMetaData.getResultColumnDescriptor(POLICYNAME,
          Types.VARCHAR, false, 128),
      EmbedResultSetMetaData.getResultColumnDescriptor(SCHEMANAME,
          Types.VARCHAR, false, 128),
      EmbedResultSetMetaData.getResultColumnDescriptor(TABLE,
          Types.VARCHAR, false, 512),
      EmbedResultSetMetaData.getResultColumnDescriptor(FOR,
          Types.VARCHAR, false, 64),
      EmbedResultSetMetaData.getResultColumnDescriptor(APPLYTO,
          Types.VARCHAR, true, Limits.DB2_VARCHAR_MAXWIDTH),
      EmbedResultSetMetaData.getResultColumnDescriptor(FILTER,
          Types.VARCHAR, false, Limits.DB2_VARCHAR_MAXWIDTH),
      EmbedResultSetMetaData.getResultColumnDescriptor(OWNER,
          Types.VARCHAR, true, 512),
  };

  private static final ResultSetMetaData metadata = new EmbedResultSetMetaData(
      columnInfo);
}