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SchemaTreeProvider.java
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SchemaTreeProvider.java
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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.drill.exec.store;
import java.util.List;
import org.apache.drill.common.AutoCloseables;
import org.apache.drill.exec.ExecConstants;
import org.apache.drill.exec.ops.ViewExpansionContext;
import org.apache.drill.exec.proto.UserBitShared.UserCredentials;
import org.apache.calcite.jdbc.DynamicSchema;
import org.apache.calcite.schema.SchemaPlus;
import org.apache.drill.exec.server.DrillbitContext;
import org.apache.drill.exec.server.options.OptionManager;
import org.apache.drill.exec.server.options.OptionValue;
import org.apache.drill.exec.store.SchemaConfig.SchemaConfigInfoProvider;
import org.apache.drill.exec.util.ImpersonationUtil;
import com.google.common.collect.Lists;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Creates new schema trees. It keeps track of newly created schema trees and
* closes them safely as part of {@link #close()}.
*/
public class SchemaTreeProvider implements AutoCloseable {
private static final Logger logger = LoggerFactory.getLogger(SchemaTreeProvider.class);
private final DrillbitContext dContext;
private final List<SchemaPlus> schemaTreesToClose;
private final boolean isImpersonationEnabled;
public SchemaTreeProvider(final DrillbitContext dContext) {
this.dContext = dContext;
schemaTreesToClose = Lists.newArrayList();
isImpersonationEnabled = dContext.getConfig().getBoolean(ExecConstants.IMPERSONATION_ENABLED);
}
/**
* Return root schema for process user.
*
* @param options list of options
* @return root of the schema tree
*/
public SchemaPlus createRootSchema(final OptionManager options) {
SchemaConfigInfoProvider schemaConfigInfoProvider = new SchemaConfigInfoProvider() {
@Override
public ViewExpansionContext getViewExpansionContext() {
throw new UnsupportedOperationException("View expansion context is not supported");
}
@Override
public OptionValue getOption(String optionKey) {
return options.getOption(optionKey);
}
@Override
public String getTemporaryTableName(String table) {
throw new UnsupportedOperationException("getTemporaryTableName is not supported");
}
@Override
public String getTemporaryWorkspace() {
throw new UnsupportedOperationException("getTemporaryWorkspace is not supported");
}
@Override public SchemaPlus getRootSchema(String userName) {
return createRootSchema(userName, this);
}
@Override public String getQueryUserName() {
return ImpersonationUtil.getProcessUserName();
}
@Override public UserCredentials getQueryUserCredentials() {
return UserCredentials.newBuilder()
.setUserName(ImpersonationUtil.getProcessUserName())
.build();
}
};
final SchemaConfig schemaConfig = SchemaConfig.newBuilder(
ImpersonationUtil.getProcessUserName(), schemaConfigInfoProvider)
.build();
return createRootSchema(schemaConfig);
}
/**
* Return root schema with schema owner as the given user.
*
* @param userName Name of the user who is accessing the storage sources.
* @param provider {@link SchemaConfigInfoProvider} instance
* @return Root of the schema tree.
*/
public SchemaPlus createRootSchema(final String userName, final SchemaConfigInfoProvider provider) {
final String schemaUser = isImpersonationEnabled ? userName : ImpersonationUtil.getProcessUserName();
final SchemaConfig schemaConfig = SchemaConfig.newBuilder(schemaUser, provider).build();
return createRootSchema(schemaConfig);
}
/**
* Create and return a SchemaTree with given <i>schemaConfig</i>.
* @param schemaConfig
* @return Root of the schema tree.
*/
public SchemaPlus createRootSchema(SchemaConfig schemaConfig) {
SchemaPlus rootSchema = DynamicSchema.createRootSchema(dContext.getStorage(), schemaConfig,
dContext.getAliasRegistryProvider());
schemaTreesToClose.add(rootSchema);
return rootSchema;
}
@Override
public void close() throws Exception {
for (SchemaPlus sp : schemaTreesToClose) {
AutoCloseables.closeWithUserException(sp.unwrap(AbstractSchema.class));
}
}
}