package com.thinkbiganalytics.nifi.v2.ingest;
/*-
* #%L
* thinkbig-nifi-core-processors
* %%
* Copyright (C) 2017 ThinkBig Analytics
* %%
* 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.
* #L%
*/
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableSet;
import com.thinkbiganalytics.ingest.TableRegisterSupport;
import com.thinkbiganalytics.nifi.processor.AbstractNiFiProcessor;
import com.thinkbiganalytics.nifi.v2.thrift.ThriftService;
import com.thinkbiganalytics.util.TableType;
import org.apache.nifi.annotation.behavior.EventDriven;
import org.apache.nifi.annotation.behavior.InputRequirement;
import org.apache.nifi.annotation.documentation.CapabilityDescription;
import org.apache.nifi.annotation.documentation.Tags;
import org.apache.nifi.components.PropertyDescriptor;
import org.apache.nifi.components.Validator;
import org.apache.nifi.flowfile.FlowFile;
import org.apache.nifi.processor.ProcessContext;
import org.apache.nifi.processor.ProcessSession;
import org.apache.nifi.processor.Relationship;
import org.apache.nifi.processor.exception.ProcessException;
import java.sql.Connection;
import java.util.Arrays;
import java.util.List;
import java.util.Set;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import javax.annotation.Nonnull;
/**
* A NiFi processor that drops the Hive tables specified in the properties.
*/
@CapabilityDescription("Drops the standard feed tables managed by the Think Big platform.")
@EventDriven
@InputRequirement(InputRequirement.Requirement.INPUT_REQUIRED)
@Tags({"hive", "ddl", "drop", "thinkbig"})
public class DropFeedTables extends AbstractNiFiProcessor {
/**
* Property specifying additional tables to drop
*/
public static final PropertyDescriptor ADDITIONAL_TABLES = new PropertyDescriptor.Builder()
.name("Additional Tables")
.description("Additional tables to drop separated by comma.")
.expressionLanguageSupported(true)
.required(false)
.addValidator(Validator.VALID) // required for unit tests, see NIFI-1977
.build();
/**
* Value indicating all tables should be dropped
*/
public static final String ALL_TABLES = "ALL";
/**
* Property indicating which tables to drop
*/
public static final PropertyDescriptor TABLE_TYPE = new PropertyDescriptor.Builder()
.name("Table Type")
.description("Specifies the standard table type to drop or ALL for standard set.")
.allowableValues(Stream.concat(Arrays.stream(TableType.values()).map(Enum::toString), Stream.of(ALL_TABLES)).collect(Collectors.toSet()))
.required(true)
.build();
/**
* Configuration fields
*/
private static final List<PropertyDescriptor> properties = ImmutableList.of(IngestProperties.THRIFT_SERVICE, IngestProperties.FEED_CATEGORY, IngestProperties.FEED_NAME, TABLE_TYPE,
ADDITIONAL_TABLES);
/**
* Output paths to other NiFi processors
*/
private static final Set<Relationship> relationships = ImmutableSet.of(IngestProperties.REL_SUCCESS, IngestProperties.REL_FAILURE);
@Nonnull
@Override
public Set<Relationship> getRelationships() {
return relationships;
}
@Nonnull
@Override
protected List<PropertyDescriptor> getSupportedPropertyDescriptors() {
return properties;
}
@Override
public void onTrigger(@Nonnull final ProcessContext context, @Nonnull final ProcessSession session) throws ProcessException {
// Verify flow file exists
FlowFile flowFile = session.get();
if (flowFile == null) {
return;
}
// Verify properties and attributes
String additionalTablesValue = context.getProperty(ADDITIONAL_TABLES).evaluateAttributeExpressions(flowFile).getValue();
Set<String> additionalTables = (additionalTablesValue != null) ? ImmutableSet.copyOf(additionalTablesValue.split(",")) : ImmutableSet.of();
String entity = context.getProperty(IngestProperties.FEED_NAME).evaluateAttributeExpressions(flowFile).getValue();
if (entity == null || entity.isEmpty()) {
getLog().error("Missing feed name");
session.transfer(flowFile, IngestProperties.REL_FAILURE);
return;
}
String source = context.getProperty(IngestProperties.FEED_CATEGORY).evaluateAttributeExpressions(flowFile).getValue();
if (source == null || source.isEmpty()) {
getLog().error("Missing category name");
session.transfer(flowFile, IngestProperties.REL_FAILURE);
return;
}
Set<TableType> tableTypes;
String tableTypesValue = context.getProperty(TABLE_TYPE).getValue();
if (ALL_TABLES.equals(tableTypesValue)) {
tableTypes = ImmutableSet.copyOf(TableType.values());
} else {
tableTypes = ImmutableSet.of(TableType.valueOf(tableTypesValue));
}
// Drop the tables
final ThriftService thriftService = context.getProperty(IngestProperties.THRIFT_SERVICE).asControllerService(ThriftService.class);
try (final Connection conn = thriftService.getConnection()) {
boolean result = new TableRegisterSupport(conn).dropTables(source, entity, tableTypes, additionalTables);
session.transfer(flowFile, result ? IngestProperties.REL_SUCCESS : IngestProperties.REL_FAILURE);
} catch (final Exception e) {
getLog().error("Unable drop tables", e);
session.transfer(flowFile, IngestProperties.REL_FAILURE);
}
}
}