| /* |
| * 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.server.options; |
| |
| import java.util.Collection; |
| import java.util.Map; |
| |
| import org.apache.commons.lang3.tuple.ImmutablePair; |
| import org.apache.drill.common.map.CaseInsensitiveMap; |
| import org.apache.drill.exec.rpc.user.UserSession; |
| |
| import com.google.common.base.Predicate; |
| import com.google.common.collect.Collections2; |
| |
| /** |
| * {@link OptionManager} that holds options within {@link org.apache.drill.exec.rpc.user.UserSession} context. Options |
| * set at the session level only apply to queries that you run during the current Drill connection. Session level |
| * settings override system level settings. |
| * |
| * NOTE that currently, the effects of deleting a short lived option (see {@link OptionValidator#isShortLived}) are |
| * undefined. For example, we inject an exception (passed through an option), then try to delete the option, depending |
| * on where the exception was injected, the reset query could either succeed or the exception could actually be thrown |
| * in the reset query itself. |
| */ |
| public class SessionOptionManager extends InMemoryOptionManager { |
| |
| private final UserSession session; |
| |
| /** |
| * Map of short lived options. Key: option name, Value: [ start, end ) |
| */ |
| private final Map<String, ImmutablePair<Integer, Integer>> shortLivedOptions = |
| CaseInsensitiveMap.newConcurrentMap(); |
| |
| public SessionOptionManager(final OptionManager systemOptions, final UserSession session) { |
| super(systemOptions, CaseInsensitiveMap.<OptionValue>newConcurrentMap()); |
| this.session = session; |
| } |
| |
| @Override |
| public void setLocalOptionHelper(final OptionValue value) { |
| super.setLocalOptionHelper(value); |
| final String name = value.name; |
| final OptionDefinition definition = getOptionDefinition(name); // if set, validator must exist. |
| final OptionValidator validator = definition.getValidator(); |
| final boolean shortLived = validator.isShortLived(); |
| if (shortLived) { |
| final int start = session.getQueryCount() + 1; // start from the next query |
| final int ttl = validator.getTtl(); |
| final int end = start + ttl; |
| shortLivedOptions.put(name, new ImmutablePair<>(start, end)); |
| } |
| } |
| |
| @Override |
| OptionValue getLocalOption(final String name) { |
| final OptionValue value = super.getLocalOption(name); |
| if (shortLivedOptions.containsKey(name)) { |
| if (withinRange(name)) { |
| return value; |
| } |
| final int queryNumber = session.getQueryCount(); |
| final int start = shortLivedOptions.get(name).getLeft(); |
| // option is not in effect if queryNumber < start |
| if (queryNumber < start) { |
| return fallback.getOption(name); |
| // reset if queryNumber <= end |
| } else { |
| options.remove(name); |
| shortLivedOptions.remove(name); |
| return null; // fallback takes effect |
| } |
| } |
| return value; |
| } |
| |
| private boolean withinRange(final String name) { |
| final int queryNumber = session.getQueryCount(); |
| final ImmutablePair<Integer, Integer> pair = shortLivedOptions.get(name); |
| final int start = pair.getLeft(); |
| final int end = pair.getRight(); |
| return start <= queryNumber && queryNumber < end; |
| } |
| |
| private final Predicate<OptionValue> isLive = new Predicate<OptionValue>() { |
| @Override |
| public boolean apply(final OptionValue value) { |
| final String name = value.name; |
| return !shortLivedOptions.containsKey(name) || withinRange(name); |
| } |
| }; |
| |
| @Override |
| Iterable<OptionValue> getLocalOptions() { |
| final Collection<OptionValue> liveOptions = Collections2.filter(options.values(), isLive); |
| return liveOptions; |
| } |
| |
| /** |
| * Gets the SystemOptionManager. |
| * @return The SystemOptionManager. |
| */ |
| public SystemOptionManager getSystemOptionManager() { |
| final SystemOptionManager systemOptionManager = (SystemOptionManager) fallback; |
| return systemOptionManager; |
| } |
| |
| @Override |
| public OptionValue getDefault(String optionName) { |
| return fallback.getDefault(optionName); |
| } |
| |
| @Override |
| protected OptionValue.OptionScope getScope() { |
| return OptionValue.OptionScope.SESSION; |
| } |
| } |