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Settings.java
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Settings.java
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/*
* Copyright (c) 2002-2017 "Neo Technology,"
* Network Engine for Objects in Lund AB [http://neotechnology.com]
*
* This file is part of Neo4j.
*
* Neo4j is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.neo4j.kernel.configuration;
import org.apache.commons.lang3.StringUtils;
import java.io.File;
import java.net.URI;
import java.net.URISyntaxException;
import java.time.Duration;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.EnumSet;
import java.util.LinkedList;
import java.util.List;
import java.util.Optional;
import java.util.function.BiFunction;
import java.util.function.Function;
import java.util.regex.Pattern;
import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import org.neo4j.graphdb.config.BaseSetting;
import org.neo4j.graphdb.config.Configuration;
import org.neo4j.graphdb.config.InvalidSettingException;
import org.neo4j.graphdb.config.ScopeAwareSetting;
import org.neo4j.graphdb.config.Setting;
import org.neo4j.graphdb.factory.GraphDatabaseSettings;
import org.neo4j.helpers.AdvertisedSocketAddress;
import org.neo4j.helpers.HostnamePort;
import org.neo4j.helpers.ListenSocketAddress;
import org.neo4j.helpers.SocketAddressParser;
import org.neo4j.helpers.TimeUtil;
import org.neo4j.helpers.collection.Iterables;
import org.neo4j.io.ByteUnit;
import static java.lang.Character.isDigit;
import static java.lang.Double.parseDouble;
import static java.lang.Float.parseFloat;
import static java.lang.Integer.parseInt;
import static java.lang.Long.parseLong;
import static java.lang.String.format;
import static org.neo4j.graphdb.factory.GraphDatabaseSettings.default_advertised_address;
import static org.neo4j.graphdb.factory.GraphDatabaseSettings.default_listen_address;
import static org.neo4j.io.fs.FileUtils.fixSeparatorsInPath;
/**
* Create settings for configurations in Neo4j. See {@link org.neo4j.graphdb.factory.GraphDatabaseSettings} for
* example.
*
* <p>Each setting has a name, a parser that converts a string to the type of the setting, a default value,
* an optional inherited setting, and optional value converters/constraints.
*
* <p>A parser is a function that takes a string and converts to some type T. The parser may throw {@link
* IllegalArgumentException} if it fails.
*
* <p>The default value is the string representation of what you want as default. Special constants NO_DEFAULT, which means
* that you don't want any default value at all, can be used if no appropriate default value exists.
*/
public class Settings
{
private static final String MATCHES_PATTERN_MESSAGE = "matches the pattern `%s`";
private interface SettingHelper<T> extends Setting<T>
{
String lookup( Function<String, String> settings );
String defaultLookup( Function<String, String> settings );
}
public static final String NO_DEFAULT = null;
public static final String EMPTY = "";
public static final String TRUE = "true";
public static final String FALSE = "false";
public static final String DEFAULT = "default";
public static final String SEPARATOR = ",";
private static final String SIZE_FORMAT = "\\d+[kmgKMG]?";
private static final String SIZE_UNITS = Arrays.toString(
SIZE_FORMAT.substring( SIZE_FORMAT.indexOf( '[' ) + 1,
SIZE_FORMAT.indexOf( ']' ) )
.toCharArray() )
.replace( "[", "" )
.replace( "]", "" );
public static final String ANY = ".+";
/**
* Helper class to build a {@link Setting}. A setting always have a name, a parser and a default value.
*
* @param <T> The concrete type of the setting that is being build
*/
public static final class SettingBuilder<T>
{
private final String name;
private final Function<String,T> parser;
private final String defaultValue;
private Setting<T> inheritedSetting;
private List<BiFunction<T, Function<String,String>,T>> valueConstraints;
private SettingBuilder( @Nonnull final String name, @Nonnull final Function<String,T> parser, @Nullable final String defaultValue )
{
this.name = name;
this.parser = parser;
this.defaultValue = defaultValue;
}
/**
* Setup a class to inherit from. Both the default value and the actual user supplied value will be inherited.
* Limited to one parent, but chains are allowed and works as expected by going up on level until a valid value
* is found.
*
* @param inheritedSetting the setting to inherit value and default value from.
* @throws AssertionError if more than one inheritance is provided.
*/
@Nonnull
public SettingBuilder<T> inherits( @Nonnull final Setting<T> inheritedSetting )
{
// Make sure we only inherits from one other setting
if ( this.inheritedSetting != null )
{
throw new AssertionError( "Can only inherit from one setting" );
}
this.inheritedSetting = inheritedSetting;
return this;
}
/**
* Add a constraint to this setting. If an error occurs, the constraint should throw {@link IllegalArgumentException}.
* Constraints are allowed to modify values and they are applied in the order they are attached to the builder.
*
* @param constraint to add.
*/
@Nonnull
public SettingBuilder<T> constraint( @Nonnull final BiFunction<T, Function<String,String>,T> constraint )
{
if ( valueConstraints == null )
{
valueConstraints = new LinkedList<>(); // Must guarantee order
}
valueConstraints.add( constraint );
return this;
}
@Nonnull
public Setting<T> build()
{
BiFunction<String,Function<String, String>, String> valueLookup = named();
BiFunction<String, Function<String, String>, String> defaultLookup = determineDefaultLookup( defaultValue, valueLookup );
if ( inheritedSetting != null )
{
valueLookup = inheritedValue( valueLookup, inheritedSetting );
defaultLookup = inheritedDefault( defaultLookup, inheritedSetting );
}
return new DefaultSetting<>( name, parser, valueLookup, defaultLookup, valueConstraints );
}
}
/**
* Constructs a {@link Setting} with a specified default value.
*
* @param name of the setting, e.g. "dbms.transaction.timeout".
* @param parser that will convert the string representation to the concrete type T.
* @param defaultValue the string representation of the default value.
* @param <T> the concrete type of the setting.
*/
@Nonnull
public static <T> Setting<T> setting( @Nonnull final String name, @Nonnull final Function<String,T> parser,
@Nullable final String defaultValue )
{
return new SettingBuilder<>( name, parser, defaultValue ).build();
}
/**
* Start building a setting with default value set to {@link Settings#NO_DEFAULT}.
*
* @param name of the setting, e.g. "dbms.transaction.timeout".
* @param parser that will convert the string representation to the concrete type T.
* @param <T> the concrete type of the setting.
*/
@Nonnull
public static <T> SettingBuilder<T> buildSetting( @Nonnull final String name, @Nonnull final Function<String, T> parser )
{
return buildSetting( name, parser, NO_DEFAULT );
}
/**
* Start building a setting with a specified default value.
*
* @param name of the setting, e.g. "dbms.transaction.timeout".
* @param parser that will convert the string representation to the concrete type T.
* @param defaultValue the string representation of the default value.
* @param <T> the concrete type of the setting.
*/
@Nonnull
public static <T> SettingBuilder<T> buildSetting( @Nonnull final String name, @Nonnull final Function<String,T> parser,
@Nullable final String defaultValue )
{
return new SettingBuilder<>( name, parser, defaultValue );
}
public static BiFunction<String,Function<String,String>,String> determineDefaultLookup( String defaultValue,
BiFunction<String,Function<String,String>,String> valueLookup )
{
BiFunction<String,Function<String,String>,String> defaultLookup;
if ( defaultValue != null )
{
defaultLookup = withDefault( defaultValue, valueLookup );
}
else
{
defaultLookup = ( n, from ) -> null;
}
return defaultLookup;
}
public static <OUT, IN1, IN2> Setting<OUT> derivedSetting( String name,
Setting<IN1> in1, Setting<IN2> in2,
BiFunction<IN1, IN2, OUT> derivation,
Function<String, OUT> overrideConverter )
{
// NOTE:
// we do not scope the input settings here (indeed they might be shared...)
// if needed we can add a configuration option to allow for it
return new ScopeAwareSetting<OUT>()
{
@Override
protected String provideName()
{
return name;
}
@Override
public String getDefaultValue()
{
return NO_DEFAULT;
}
@Override
public OUT from( Configuration config )
{
return config.get( this );
}
@Override
public OUT apply( Function<String, String> config )
{
String override = config.apply( name() );
if ( override != null )
{
// Derived settings are intended not to be overridden and we should throw an exception here. However
// we temporarily need to allow the Desktop app to override the value of the derived setting
// unsupported.dbms.directories.database because we are not yet in a position to rework it to
// conform to the standard directory structure layout.
return overrideConverter.apply( override );
}
return derivation.apply( in1.apply( config ), in2.apply( config ) );
}
@Override
public String valueDescription()
{
return in1.valueDescription();
}
};
}
public static <OUT, IN1> Setting<OUT> derivedSetting( String name,
Setting<IN1> in1,
Function<IN1, OUT> derivation,
Function<String,OUT> overrideConverter )
{
return new ScopeAwareSetting<OUT>()
{
@Override
protected String provideName()
{
return name;
}
@Override
public String getDefaultValue()
{
return NO_DEFAULT;
}
@Override
public OUT from( Configuration config )
{
return config.get( this );
}
@Override
public OUT apply( Function<String, String> config )
{
String override = config.apply( name() );
if ( override != null )
{
return overrideConverter.apply( override );
}
return derivation.apply( in1.apply( config ) );
}
@Override
public String valueDescription()
{
return in1.valueDescription();
}
};
}
public static Setting<File> pathSetting( String name, String defaultValue )
{
return new FileSetting( name, defaultValue );
}
public static Setting<File> pathSetting( String name, String defaultValue, Setting<File> relativeRoot )
{
return new FileSetting( name, defaultValue, relativeRoot );
}
private static <T> BiFunction<String,Function<String, String>, String> inheritedValue(
final BiFunction<String,Function<String,String>, String> lookup, final Setting<T> inheritedSetting )
{
return ( name, settings ) ->
{
String value = lookup.apply( name, settings );
if ( value == null )
{
value = ((SettingHelper<T>) inheritedSetting).lookup( settings );
}
return value;
};
}
private static <T> BiFunction<String,Function<String, String>, String> inheritedDefault(
final BiFunction<String,Function<String,String>, String> lookup, final Setting<T> inheritedSetting )
{
return ( name, settings ) ->
{
String value = lookup.apply( name, settings );
if ( value == null )
{
value = ((SettingHelper<T>) inheritedSetting).defaultLookup( settings );
}
return value;
};
}
public static final Function<String, Integer> INTEGER = new Function<String, Integer>()
{
@Override
public Integer apply( String value )
{
try
{
return parseInt( value );
}
catch ( NumberFormatException e )
{
throw new IllegalArgumentException( "not a valid integer value" );
}
}
@Override
public String toString()
{
return "an integer";
}
};
public static final Function<String, Long> LONG = new Function<String, Long>()
{
@Override
public Long apply( String value )
{
try
{
return parseLong( value );
}
catch ( NumberFormatException e )
{
throw new IllegalArgumentException( "not a valid long value" );
}
}
@Override
public String toString()
{
return "a long";
}
};
public static final Function<String, Boolean> BOOLEAN = new Function<String, Boolean>()
{
@Override
public Boolean apply( String value )
{
if ( value.equalsIgnoreCase( "true" ) )
{
return true;
}
else if ( value.equalsIgnoreCase( "false" ) )
{
return false;
}
else
{
throw new IllegalArgumentException( "must be 'true' or 'false'" );
}
}
@Override
public String toString()
{
return "a boolean";
}
};
public static final Function<String, Float> FLOAT = new Function<String, Float>()
{
@Override
public Float apply( String value )
{
try
{
return parseFloat( value );
}
catch ( NumberFormatException e )
{
throw new IllegalArgumentException( "not a valid float value" );
}
}
@Override
public String toString()
{
return "a float";
}
};
public static final Function<String, Double> DOUBLE = new Function<String, Double>()
{
@Override
public Double apply( String value )
{
try
{
return parseDouble( value );
}
catch ( NumberFormatException e )
{
throw new IllegalArgumentException( "not a valid double value" );
}
}
@Override
public String toString()
{
return "a double";
}
};
public static final Function<String, String> STRING = new Function<String, String>()
{
@Override
public String apply( String value )
{
return value.trim();
}
@Override
public String toString()
{
return "a string";
}
};
public static final Function<String,List<String>> STRING_LIST = list( SEPARATOR, STRING );
public static final Function<String,HostnamePort> HOSTNAME_PORT = new Function<String, HostnamePort>()
{
@Override
public HostnamePort apply( String value )
{
return new HostnamePort( value );
}
@Override
public String toString()
{
return "a hostname and port";
}
};
public static final Function<String,Duration> DURATION = new Function<String, Duration>()
{
@Override
public Duration apply( String value )
{
return Duration.ofMillis( TimeUtil.parseTimeMillis.apply( value ) );
}
@Override
public String toString()
{
return "a duration (" + TimeUtil.VALID_TIME_DESCRIPTION + ")";
}
};
public static final Function<String, ListenSocketAddress> LISTEN_SOCKET_ADDRESS =
new Function<String, ListenSocketAddress>()
{
@Override
public ListenSocketAddress apply( String value )
{
return SocketAddressParser.socketAddress( value, ListenSocketAddress::new );
}
@Override
public String toString()
{
return "a listen socket address";
}
};
public static final Function<String, AdvertisedSocketAddress> ADVERTISED_SOCKET_ADDRESS =
new Function<String, AdvertisedSocketAddress>()
{
@Override
public AdvertisedSocketAddress apply( String value )
{
return SocketAddressParser.socketAddress( value, AdvertisedSocketAddress::new );
}
@Override
public String toString()
{
return "an advertised socket address";
}
};
public static BaseSetting<ListenSocketAddress> listenAddress( String name, int defaultPort )
{
return new ScopeAwareSetting<ListenSocketAddress>()
{
@Override
protected String provideName()
{
return name;
}
@Override
public String getDefaultValue()
{
return default_listen_address.getDefaultValue() + ":" + defaultPort;
}
@Override
public ListenSocketAddress from( Configuration config )
{
return config.get( this );
}
@Override
public ListenSocketAddress apply( Function<String, String> config )
{
String name = name();
String value = config.apply( name );
String hostname = default_listen_address.apply( config );
return SocketAddressParser.deriveSocketAddress( name, value, hostname, defaultPort, ListenSocketAddress::new );
}
@Override
public String valueDescription()
{
return LISTEN_SOCKET_ADDRESS.toString();
}
};
}
public static BaseSetting<AdvertisedSocketAddress> advertisedAddress( String name,
Setting<ListenSocketAddress> listenAddressSetting )
{
return new ScopeAwareSetting<AdvertisedSocketAddress>()
{
@Override
protected String provideName()
{
return name;
}
@Override
public String getDefaultValue()
{
return default_advertised_address.getDefaultValue() + ":" +
LISTEN_SOCKET_ADDRESS.apply( listenAddressSetting.getDefaultValue() ).socketAddress().getPort();
}
@Override
public AdvertisedSocketAddress from( Configuration config )
{
return config.get( this );
}
@Override
public AdvertisedSocketAddress apply( Function<String, String> config )
{
ListenSocketAddress listenSocketAddress = listenAddressSetting.apply( config );
String hostname = default_advertised_address.apply( config );
int port = listenSocketAddress.socketAddress().getPort();
String name = name();
String value = config.apply( name );
return SocketAddressParser.deriveSocketAddress( name, value, hostname, port, AdvertisedSocketAddress::new );
}
@Override
public void withScope( Function<String,String> scopingRule )
{
super.withScope( scopingRule );
listenAddressSetting.withScope( scopingRule );
}
@Override
public String valueDescription()
{
return ADVERTISED_SOCKET_ADDRESS.toString();
}
};
}
public static final Function<String, Long> BYTES = new Function<String, Long>()
{
@Override
public Long apply( String value )
{
long bytes;
try
{
bytes = ByteUnit.parse( value );
}
catch ( IllegalArgumentException e )
{
throw new IllegalArgumentException( format(
"%s is not a valid size, must be e.g. 10, 5K, 1M, 11G", value ) );
}
if ( bytes < 0 )
{
throw new IllegalArgumentException(
value + " is not a valid number of bytes. Must be positive or zero." );
}
return bytes;
}
@Override
public String toString()
{
return "a byte size (valid multipliers are `" + SIZE_UNITS.replace( ", ", "`, `" ) + "`)";
}
};
public static final Function<String, URI> URI =
new Function<String, URI>()
{
@Override
public URI apply( String value )
{
try
{
return new URI( value );
}
catch ( URISyntaxException e )
{
throw new IllegalArgumentException( "not a valid URI" );
}
}
@Override
public String toString()
{
return "a URI";
}
};
public static final Function<String, URI> NORMALIZED_RELATIVE_URI = new Function<String, URI>()
{
@Override
public URI apply( String value )
{
try
{
String normalizedUri = new URI( value ).normalize().getPath();
if ( normalizedUri.endsWith( "/" ) )
{
// Force the string end without "/"
normalizedUri = normalizedUri.substring( 0, normalizedUri.length() - 1 );
}
return new URI( normalizedUri );
}
catch ( URISyntaxException e )
{
throw new IllegalArgumentException( "not a valid URI" );
}
}
@Override
public String toString()
{
return "a URI";
}
};
public static final Function<String, File> PATH = new Function<String, File>()
{
@Override
public File apply( String setting )
{
File file = new File( fixSeparatorsInPath( setting ) );
if ( !file.isAbsolute() )
{
throw new IllegalArgumentException( "Paths must be absolute. Got " + file );
}
return file;
}
@Override
public String toString()
{
return "a path";
}
};
public static <T extends Enum<T>> Function<String, T> options( final Class<T> enumClass )
{
return options( EnumSet.allOf( enumClass ), false );
}
public static <T extends Enum<T>> Function<String, T> options( final Class<T> enumClass, boolean ignoreCase )
{
return options( EnumSet.allOf( enumClass ), ignoreCase );
}
public static <T> Function<String, T> options( T... optionValues )
{
return options( Iterables.iterable( optionValues ), false );
}
public static <T> Function<String, T> optionsIgnoreCase( T... optionValues )
{
return options( Iterables.iterable( optionValues ), true );
}
public static <T> Function<String, T> options( final Iterable<T> optionValues, final boolean ignoreCase )
{
return new Function<String, T>()
{
@Override
public T apply( String value )
{
for ( T optionValue : optionValues )
{
String allowedValue = optionValue.toString();
if ( allowedValue.equals( value ) || (ignoreCase && allowedValue.equalsIgnoreCase( value )) )
{
return optionValue;
}
}
String possibleValues = Iterables.asList( optionValues ).toString();
throw new IllegalArgumentException(
"must be one of " + possibleValues + " case " + (ignoreCase ? "insensitive" : "sensitive") );
}
@Override
public String toString()
{
return describeOneOf( optionValues );
}
};
}
/**
*
* @param optionValues iterable of objects with descriptive toString methods
* @return a string describing possible values like "one of `X, Y, Z`"
*/
@Nonnull
public static String describeOneOf( @Nonnull Iterable optionValues )
{
StringBuilder builder = new StringBuilder();
builder.append( "one of `" );
String comma = "";
for ( Object optionValue : optionValues )
{
builder.append( comma ).append( optionValue.toString() );
comma = "`, `";
}
builder.append( "`" );
return builder.toString();
}
public static <T> Function<String, List<T>> list( final String separator, final Function<String, T> itemParser )
{
return new Function<String, List<T>>()
{
@Override
public List<T> apply( String value )
{
List<T> list = new ArrayList<>();
String[] parts = value.split( separator );
for ( String part : parts )
{
part = part.trim();
if ( StringUtils.isNotEmpty( part ) )
{
list.add( itemParser.apply( part ) );
}
}
return list;
}
@Override
public String toString()
{
return "a list separated by \"" + separator + "\" where items are " + itemParser.toString();
}
};
}
// Modifiers
public static BiFunction<String, Function<String, String>, String> matches( final String regex )
{
final Pattern pattern = Pattern.compile( regex );
return new BiFunction<String, Function<String, String>, String>()
{
@Override
public String apply( String value, Function<String, String> settings )
{
if ( !pattern.matcher( value ).matches() )
{
throw new IllegalArgumentException( "value does not match expression:" + regex );
}
return value;
}
@Override
public String toString()
{
return format( MATCHES_PATTERN_MESSAGE, regex );
}
};
}
public static BiFunction<List<String>,Function<String,String>,List<String>> nonEmptyList =
new BiFunction<List<String>,Function<String,String>,List<String>>()
{
@Override
public List<String> apply( List<String> values, Function<String,String> settings )
{
if ( values.isEmpty() )
{
throw new IllegalArgumentException( "setting must not be empty" );
}
return values;
}
@Override
public String toString()
{
return "non-empty list";
}
};
public static BiFunction<List<String>,Function<String,String>,List<String>> matchesAny( final String regex )
{
final Pattern pattern = Pattern.compile( regex );
return new BiFunction<List<String>,Function<String,String>,List<String>>()
{
@Override
public List<String> apply( List<String> values, Function<String,String> settings )
{
for ( String value : values )
{
if ( !pattern.matcher( value ).matches() )
{
throw new IllegalArgumentException( "value does not match expression:" + regex );
}
}
return values;
}
@Override
public String toString()
{
return format( MATCHES_PATTERN_MESSAGE, regex );
}
};
}
public static <T extends Comparable<T>> BiFunction<T, Function<String, String>, T> min( final T min )
{
return new BiFunction<T, Function<String, String>, T>()
{
@Override
public T apply( T value, Function<String, String> settings )
{
if ( value != null && value.compareTo( min ) < 0 )
{
throw new IllegalArgumentException( format( "minimum allowed value is: %s", min ) );
}
return value;
}
@Override
public String toString()
{
return "is minimum `" + min + "`";
}
};
}
public static <T extends Comparable<T>> BiFunction<T, Function<String, String>, T> max( final T max )
{
return new BiFunction<T, Function<String, String>, T>()
{
@Override
public T apply( T value, Function<String, String> settings )
{
if ( value != null && value.compareTo( max ) > 0 )
{
throw new IllegalArgumentException( format( "maximum allowed value is: %s", max ) );
}
return value;
}
@Override
public String toString()
{
return "is maximum `" + max + "`";
}
};
}
public static <T extends Comparable<T>> BiFunction<T, Function<String, String>, T> range( final T min, final T max )
{
return new BiFunction<T, Function<String, String>, T>()
{
@Override
public T apply( T from1, Function<String, String> from2 )
{
return min(min).apply( max(max).apply( from1, from2 ), from2 );
}
@Override
public String toString()
{
return format( "is in the range `%s` to `%s`", min, max );
}
};
}
public static final BiFunction<Integer, Function<String, String>, Integer> port =
illegalValueMessage( "must be a valid port number", range( 0, 65535 ) );
public static <T> BiFunction<T, Function<String, String>, T> illegalValueMessage( final String message,
final BiFunction<T,Function<String,String>,T> valueFunction )
{
return new BiFunction<T, Function<String, String>, T>()
{
@Override