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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.sys;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import org.apache.drill.exec.ops.FragmentContext;
import org.apache.drill.exec.server.options.DrillConfigIterator;
import org.apache.drill.exec.server.options.OptionManager;
import org.apache.drill.exec.server.options.OptionValue;
import org.apache.drill.exec.server.options.OptionValue.AccessibleScopes;
import org.apache.drill.exec.server.options.OptionValue.Kind;
import org.apache.drill.exec.server.options.OptionValue.OptionScope;
import org.apache.drill.exec.store.pojo.NonNullable;
import com.google.common.collect.Iterators;
import com.google.common.collect.Lists;
public class OptionIterator implements Iterator<Object> {
// private static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(OptionIterator.class);
enum Mode {
BOOT,
// These represent System/Session options that are public. These are available for everyone to change and are considered safe to change.
SYS_SESS_PUBLIC,
// These represent System/Session options that are internal. These are segregated from the public options and are not visible in the same tables and rest endpoints as public
// options. These are technically available for anyone to change, but users are discouraged from doing so unless they absolutely know what they are doing. The general purpose
// for internal options is to enable support to easily debug.
SYS_SESS_INTERNAL
};
private final OptionManager fragmentOptions;
private final Iterator<OptionValue> mergedOptions;
public OptionIterator(FragmentContext context, Mode mode){
final DrillConfigIterator configOptions = new DrillConfigIterator(context.getConfig());
fragmentOptions = context.getOptions();
final Iterator<OptionValue> optionList;
switch(mode){
case BOOT:
optionList = configOptions.iterator();
break;
case SYS_SESS_PUBLIC:
optionList = fragmentOptions.getPublicOptionList().iterator();
break;
case SYS_SESS_INTERNAL:
optionList = fragmentOptions.getInternalOptionList().iterator();
break;
default:
optionList = Iterators.concat(configOptions.iterator(), fragmentOptions.iterator());
}
List<OptionValue> values = Lists.newArrayList(optionList);
Collections.sort(values);
mergedOptions = values.iterator();
}
@Override
public boolean hasNext() {
return mergedOptions.hasNext();
}
@Override
public OptionValueWrapper next() {
final OptionValue value = mergedOptions.next();
final Status status;
if (value.accessibleScopes == AccessibleScopes.BOOT) {
status = Status.BOOT;
} else {
final OptionValue def = fragmentOptions.getDefault(value.name);
if (value.equalsIgnoreType(def)) {
status = Status.DEFAULT;
} else {
status = Status.CHANGED;
}
}
return new OptionValueWrapper(value.name, value.kind, value.accessibleScopes, value.scope, value.num_val, value.string_val,
value.bool_val, value.float_val, status);
}
public enum Status {
BOOT, DEFAULT, CHANGED
}
/**
* Wrapper class for OptionValue to add Status
*/
public static class OptionValueWrapper {
@NonNullable
public final String name;
@NonNullable
public final Kind kind;
@NonNullable
public final AccessibleScopes accessibleScopes;
@NonNullable
public final OptionScope optionScope;
@NonNullable
public final Status status;
public final Long num_val;
public final String string_val;
public final Boolean bool_val;
public final Double float_val;
public OptionValueWrapper(final String name, final Kind kind, final OptionValue.AccessibleScopes type, final OptionScope scope, final Long num_val,
final String string_val, final Boolean bool_val, final Double float_val,
final Status status) {
this.name = name;
this.kind = kind;
this.accessibleScopes = type;
this.optionScope = scope;
this.num_val = num_val;
this.string_val = string_val;
this.bool_val = bool_val;
this.float_val = float_val;
this.status = status;
}
}
@Override
public void remove() {
throw new UnsupportedOperationException();
}
}
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