org.apache.flink.configuration.Configuration Maven / Gradle / Ivy
/*
* 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.flink.configuration;
import org.apache.flink.annotation.Public;
import org.apache.flink.annotation.PublicEvolving;
import org.apache.flink.api.common.ExecutionConfig;
import org.apache.flink.core.io.IOReadableWritable;
import org.apache.flink.core.memory.DataInputView;
import org.apache.flink.core.memory.DataOutputView;
import org.apache.flink.types.StringValue;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.IOException;
import java.util.Arrays;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Properties;
import java.util.Set;
/**
* Lightweight configuration object which stores key/value pairs.
*/
@Public
public class Configuration extends ExecutionConfig.GlobalJobParameters
implements IOReadableWritable, java.io.Serializable, Cloneable {
private static final long serialVersionUID = 1L;
private static final byte TYPE_STRING = 0;
private static final byte TYPE_INT = 1;
private static final byte TYPE_LONG = 2;
private static final byte TYPE_BOOLEAN = 3;
private static final byte TYPE_FLOAT = 4;
private static final byte TYPE_DOUBLE = 5;
private static final byte TYPE_BYTES = 6;
/** The log object used for debugging. */
private static final Logger LOG = LoggerFactory.getLogger(Configuration.class);
/** Stores the concrete key/value pairs of this configuration object. */
protected final HashMap confData;
// --------------------------------------------------------------------------------------------
/**
* Creates a new empty configuration.
*/
public Configuration() {
this.confData = new HashMap<>();
}
/**
* Creates a new configuration with the copy of the given configuration.
*
* @param other The configuration to copy the entries from.
*/
public Configuration(Configuration other) {
this.confData = new HashMap<>(other.confData);
}
// --------------------------------------------------------------------------------------------
/**
* Returns the class associated with the given key as a string.
*
* @param The type of the class to return.
* @param key The key pointing to the associated value
* @param defaultValue The optional default value returned if no entry exists
* @param classLoader The class loader used to resolve the class.
*
* @return The value associated with the given key, or the default value, if to entry for the key exists.
*/
@SuppressWarnings("unchecked")
public Class getClass(String key, Class defaultValue, ClassLoader classLoader) throws ClassNotFoundException {
Object o = getRawValue(key);
if (o == null) {
return (Class) defaultValue;
}
if (o.getClass() == String.class) {
return (Class) Class.forName((String) o, true, classLoader);
}
LOG.warn("Configuration cannot evaluate value " + o + " as a class name");
return (Class) defaultValue;
}
/**
* Adds the given key/value pair to the configuration object. The class can be retrieved by invoking
* {@link #getClass(String, Class, ClassLoader)} if it is in the scope of the class loader on the caller.
*
* @param key The key of the pair to be added
* @param klazz The value of the pair to be added
* @see #getClass(String, Class, ClassLoader)
*/
public void setClass(String key, Class klazz) {
setValueInternal(key, klazz.getName());
}
/**
* Returns the value associated with the given key as a string.
*
* @param key
* the key pointing to the associated value
* @param defaultValue
* the default value which is returned in case there is no value associated with the given key
* @return the (default) value associated with the given key
*/
public String getString(String key, String defaultValue) {
Object o = getRawValue(key);
if (o == null) {
return defaultValue;
} else {
return o.toString();
}
}
/**
* Returns the value associated with the given config option as a string.
*
* @param configOption The configuration option
* @return the (default) value associated with the given config option
*/
@PublicEvolving
public String getString(ConfigOption configOption) {
Object o = getValueOrDefaultFromOption(configOption);
return o == null ? null : o.toString();
}
/**
* Returns the value associated with the given config option as a string.
* If no value is mapped under any key of the option, it returns the specified
* default instead of the option's default value.
*
* @param configOption The configuration option
* @return the (default) value associated with the given config option
*/
@PublicEvolving
public String getString(ConfigOption configOption, String overrideDefault) {
Object o = getRawValueFromOption(configOption);
return o == null ? overrideDefault : o.toString();
}
/**
* Adds the given key/value pair to the configuration object.
*
* @param key
* the key of the key/value pair to be added
* @param value
* the value of the key/value pair to be added
*/
public void setString(String key, String value) {
setValueInternal(key, value);
}
/**
* Adds the given value to the configuration object.
* The main key of the config option will be used to map the value.
*
* @param key
* the option specifying the key to be added
* @param value
* the value of the key/value pair to be added
*/
@PublicEvolving
public void setString(ConfigOption key, String value) {
setValueInternal(key.key(), value);
}
/**
* Returns the value associated with the given key as an integer.
*
* @param key
* the key pointing to the associated value
* @param defaultValue
* the default value which is returned in case there is no value associated with the given key
* @return the (default) value associated with the given key
*/
public int getInteger(String key, int defaultValue) {
Object o = getRawValue(key);
if (o == null) {
return defaultValue;
}
return convertToInt(o, defaultValue);
}
/**
* Returns the value associated with the given config option as an integer.
*
* @param configOption The configuration option
* @return the (default) value associated with the given config option
*/
@PublicEvolving
public int getInteger(ConfigOption configOption) {
Object o = getValueOrDefaultFromOption(configOption);
return convertToInt(o, configOption.defaultValue());
}
/**
* Returns the value associated with the given config option as an integer.
* If no value is mapped under any key of the option, it returns the specified
* default instead of the option's default value.
*
* @param configOption The configuration option
* @param overrideDefault The value to return if no value was mapper for any key of the option
* @return the configured value associated with the given config option, or the overrideDefault
*/
@PublicEvolving
public int getInteger(ConfigOption configOption, int overrideDefault) {
Object o = getRawValueFromOption(configOption);
if (o == null) {
return overrideDefault;
}
return convertToInt(o, configOption.defaultValue());
}
/**
* Adds the given key/value pair to the configuration object.
*
* @param key
* the key of the key/value pair to be added
* @param value
* the value of the key/value pair to be added
*/
public void setInteger(String key, int value) {
setValueInternal(key, value);
}
/**
* Adds the given value to the configuration object.
* The main key of the config option will be used to map the value.
*
* @param key
* the option specifying the key to be added
* @param value
* the value of the key/value pair to be added
*/
@PublicEvolving
public void setInteger(ConfigOption key, int value) {
setValueInternal(key.key(), value);
}
/**
* Returns the value associated with the given key as a long.
*
* @param key
* the key pointing to the associated value
* @param defaultValue
* the default value which is returned in case there is no value associated with the given key
* @return the (default) value associated with the given key
*/
public long getLong(String key, long defaultValue) {
Object o = getRawValue(key);
if (o == null) {
return defaultValue;
}
return convertToLong(o, defaultValue);
}
/**
* Returns the value associated with the given config option as a long integer.
*
* @param configOption The configuration option
* @return the (default) value associated with the given config option
*/
@PublicEvolving
public long getLong(ConfigOption configOption) {
Object o = getValueOrDefaultFromOption(configOption);
return convertToLong(o, configOption.defaultValue());
}
/**
* Returns the value associated with the given config option as a long integer.
* If no value is mapped under any key of the option, it returns the specified
* default instead of the option's default value.
*
* @param configOption The configuration option
* @param overrideDefault The value to return if no value was mapper for any key of the option
* @return the configured value associated with the given config option, or the overrideDefault
*/
@PublicEvolving
public long getLong(ConfigOption configOption, long overrideDefault) {
Object o = getRawValueFromOption(configOption);
if (o == null) {
return overrideDefault;
}
return convertToLong(o, configOption.defaultValue());
}
/**
* Adds the given key/value pair to the configuration object.
*
* @param key
* the key of the key/value pair to be added
* @param value
* the value of the key/value pair to be added
*/
public void setLong(String key, long value) {
setValueInternal(key, value);
}
/**
* Adds the given value to the configuration object.
* The main key of the config option will be used to map the value.
*
* @param key
* the option specifying the key to be added
* @param value
* the value of the key/value pair to be added
*/
@PublicEvolving
public void setLong(ConfigOption key, long value) {
setValueInternal(key.key(), value);
}
/**
* Returns the value associated with the given key as a boolean.
*
* @param key
* the key pointing to the associated value
* @param defaultValue
* the default value which is returned in case there is no value associated with the given key
* @return the (default) value associated with the given key
*/
public boolean getBoolean(String key, boolean defaultValue) {
Object o = getRawValue(key);
if (o == null) {
return defaultValue;
}
return convertToBoolean(o);
}
/**
* Returns the value associated with the given config option as a boolean.
*
* @param configOption The configuration option
* @return the (default) value associated with the given config option
*/
@PublicEvolving
public boolean getBoolean(ConfigOption configOption) {
Object o = getValueOrDefaultFromOption(configOption);
return convertToBoolean(o);
}
/**
* Returns the value associated with the given config option as a boolean.
* If no value is mapped under any key of the option, it returns the specified
* default instead of the option's default value.
*
* @param configOption The configuration option
* @param overrideDefault The value to return if no value was mapper for any key of the option
* @return the configured value associated with the given config option, or the overrideDefault
*/
@PublicEvolving
public boolean getBoolean(ConfigOption configOption, boolean overrideDefault) {
Object o = getRawValueFromOption(configOption);
if (o == null) {
return overrideDefault;
}
return convertToBoolean(o);
}
/**
* Adds the given key/value pair to the configuration object.
*
* @param key
* the key of the key/value pair to be added
* @param value
* the value of the key/value pair to be added
*/
public void setBoolean(String key, boolean value) {
setValueInternal(key, value);
}
/**
* Adds the given value to the configuration object.
* The main key of the config option will be used to map the value.
*
* @param key
* the option specifying the key to be added
* @param value
* the value of the key/value pair to be added
*/
@PublicEvolving
public void setBoolean(ConfigOption key, boolean value) {
setValueInternal(key.key(), value);
}
/**
* Returns the value associated with the given key as a float.
*
* @param key
* the key pointing to the associated value
* @param defaultValue
* the default value which is returned in case there is no value associated with the given key
* @return the (default) value associated with the given key
*/
public float getFloat(String key, float defaultValue) {
Object o = getRawValue(key);
if (o == null) {
return defaultValue;
}
return convertToFloat(o, defaultValue);
}
/**
* Returns the value associated with the given config option as a float.
*
* @param configOption The configuration option
* @return the (default) value associated with the given config option
*/
@PublicEvolving
public float getFloat(ConfigOption configOption) {
Object o = getValueOrDefaultFromOption(configOption);
return convertToFloat(o, configOption.defaultValue());
}
/**
* Returns the value associated with the given config option as a float.
* If no value is mapped under any key of the option, it returns the specified
* default instead of the option's default value.
*
* @param configOption The configuration option
* @param overrideDefault The value to return if no value was mapper for any key of the option
* @return the configured value associated with the given config option, or the overrideDefault
*/
@PublicEvolving
public float getFloat(ConfigOption configOption, float overrideDefault) {
Object o = getRawValueFromOption(configOption);
if (o == null) {
return overrideDefault;
}
return convertToFloat(o, configOption.defaultValue());
}
/**
* Adds the given key/value pair to the configuration object.
*
* @param key
* the key of the key/value pair to be added
* @param value
* the value of the key/value pair to be added
*/
public void setFloat(String key, float value) {
setValueInternal(key, value);
}
/**
* Adds the given value to the configuration object.
* The main key of the config option will be used to map the value.
*
* @param key
* the option specifying the key to be added
* @param value
* the value of the key/value pair to be added
*/
@PublicEvolving
public void setFloat(ConfigOption key, float value) {
setValueInternal(key.key(), value);
}
/**
* Returns the value associated with the given key as a double.
*
* @param key
* the key pointing to the associated value
* @param defaultValue
* the default value which is returned in case there is no value associated with the given key
* @return the (default) value associated with the given key
*/
public double getDouble(String key, double defaultValue) {
Object o = getRawValue(key);
if (o == null) {
return defaultValue;
}
return convertToDouble(o, defaultValue);
}
/**
* Returns the value associated with the given config option as a {@code double}.
*
* @param configOption The configuration option
* @return the (default) value associated with the given config option
*/
@PublicEvolving
public double getDouble(ConfigOption configOption) {
Object o = getValueOrDefaultFromOption(configOption);
return convertToDouble(o, configOption.defaultValue());
}
/**
* Returns the value associated with the given config option as a {@code double}.
* If no value is mapped under any key of the option, it returns the specified
* default instead of the option's default value.
*
* @param configOption The configuration option
* @param overrideDefault The value to return if no value was mapper for any key of the option
* @return the configured value associated with the given config option, or the overrideDefault
*/
@PublicEvolving
public double getDouble(ConfigOption configOption, double overrideDefault) {
Object o = getRawValueFromOption(configOption);
if (o == null) {
return overrideDefault;
}
return convertToDouble(o, configOption.defaultValue());
}
/**
* Adds the given key/value pair to the configuration object.
*
* @param key
* the key of the key/value pair to be added
* @param value
* the value of the key/value pair to be added
*/
public void setDouble(String key, double value) {
setValueInternal(key, value);
}
/**
* Adds the given value to the configuration object.
* The main key of the config option will be used to map the value.
*
* @param key
* the option specifying the key to be added
* @param value
* the value of the key/value pair to be added
*/
@PublicEvolving
public void setDouble(ConfigOption key, double value) {
setValueInternal(key.key(), value);
}
/**
* Returns the value associated with the given key as a byte array.
*
* @param key
* The key pointing to the associated value.
* @param defaultValue
* The default value which is returned in case there is no value associated with the given key.
* @return the (default) value associated with the given key.
*/
@SuppressWarnings("EqualsBetweenInconvertibleTypes")
public byte[] getBytes(String key, byte[] defaultValue) {
Object o = getRawValue(key);
if (o == null) {
return defaultValue;
}
else if (o.getClass().equals(byte[].class)) {
return (byte[]) o;
}
else {
LOG.warn("Configuration cannot evaluate value {} as a byte[] value", o);
return defaultValue;
}
}
/**
* Adds the given byte array to the configuration object. If key is null then nothing is added.
*
* @param key
* The key under which the bytes are added.
* @param bytes
* The bytes to be added.
*/
public void setBytes(String key, byte[] bytes) {
setValueInternal(key, bytes);
}
/**
* Returns the value associated with the given config option as a string.
*
* @param configOption The configuration option
* @return the (default) value associated with the given config option
*/
@PublicEvolving
public String getValue(ConfigOption configOption) {
Object o = getValueOrDefaultFromOption(configOption);
return o == null ? null : o.toString();
}
// --------------------------------------------------------------------------------------------
/**
* Returns the keys of all key/value pairs stored inside this
* configuration object.
*
* @return the keys of all key/value pairs stored inside this configuration object
*/
public Set keySet() {
synchronized (this.confData) {
return new HashSet<>(this.confData.keySet());
}
}
/**
* Adds all entries in this {@code Configuration} to the given {@link Properties}.
*/
public void addAllToProperties(Properties props) {
synchronized (this.confData) {
for (Map.Entry entry : this.confData.entrySet()) {
props.put(entry.getKey(), entry.getValue());
}
}
}
public void addAll(Configuration other) {
synchronized (this.confData) {
synchronized (other.confData) {
this.confData.putAll(other.confData);
}
}
}
public void addAll(Map other) {
synchronized (this.confData) {
this.confData.putAll(other);
}
}
/**
* Adds all entries from the given configuration into this configuration. The keys
* are prepended with the given prefix.
*
* @param other
* The configuration whose entries are added to this configuration.
* @param prefix
* The prefix to prepend.
*/
public void addAll(Configuration other, String prefix) {
final StringBuilder bld = new StringBuilder();
bld.append(prefix);
final int pl = bld.length();
synchronized (this.confData) {
synchronized (other.confData) {
for (Map.Entry entry : other.confData.entrySet()) {
bld.setLength(pl);
bld.append(entry.getKey());
this.confData.put(bld.toString(), entry.getValue());
}
}
}
}
@Override
public Configuration clone() {
Configuration config = new Configuration();
config.addAll(this);
return config;
}
/**
* Checks whether there is an entry with the specified key.
*
* @param key key of entry
* @return true if the key is stored, false otherwise
*/
public boolean containsKey(String key){
synchronized (this.confData){
return this.confData.containsKey(key);
}
}
/**
* Checks whether there is an entry for the given config option.
*
* @param configOption The configuration option
*
* @return true if a valid (current or deprecated) key of the config option is stored,
* false otherwise
*/
@PublicEvolving
public boolean contains(ConfigOption configOption) {
synchronized (this.confData){
// first try the current key
if (this.confData.containsKey(configOption.key())) {
return true;
}
else if (configOption.hasDeprecatedKeys()) {
// try the deprecated keys
for (String deprecatedKey : configOption.deprecatedKeys()) {
if (this.confData.containsKey(deprecatedKey)) {
LOG.warn("Config uses deprecated configuration key '{}' instead of proper key '{}'",
deprecatedKey, configOption.key());
return true;
}
}
}
return false;
}
}
public void remove(String key) {
synchronized (this.confData) {
this.confData.remove(key);
}
}
public void remove(ConfigOption configOption) {
synchronized (this.confData) {
this.confData.remove(configOption.key());
}
}
// --------------------------------------------------------------------------------------------
@Override
public Map toMap() {
synchronized (this.confData){
Map ret = new HashMap<>(this.confData.size());
for (Map.Entry entry : confData.entrySet()) {
ret.put(entry.getKey(), entry.getValue().toString());
}
return ret;
}
}
// --------------------------------------------------------------------------------------------
void setValueInternal(String key, T value) {
if (key == null) {
throw new NullPointerException("Key must not be null.");
}
if (value == null) {
throw new NullPointerException("Value must not be null.");
}
synchronized (this.confData) {
this.confData.put(key, value);
}
}
private Object getRawValue(String key) {
if (key == null) {
throw new NullPointerException("Key must not be null.");
}
synchronized (this.confData) {
return this.confData.get(key);
}
}
private Object getRawValueFromOption(ConfigOption configOption) {
// first try the current key
Object o = getRawValue(configOption.key());
if (o != null) {
// found a value for the current proper key
return o;
}
else if (configOption.hasDeprecatedKeys()) {
// try the deprecated keys
for (String deprecatedKey : configOption.deprecatedKeys()) {
Object oo = getRawValue(deprecatedKey);
if (oo != null) {
LOG.warn("Config uses deprecated configuration key '{}' instead of proper key '{}'",
deprecatedKey, configOption.key());
return oo;
}
}
}
return null;
}
private Object getValueOrDefaultFromOption(ConfigOption configOption) {
Object o = getRawValueFromOption(configOption);
return o != null ? o : configOption.defaultValue();
}
// --------------------------------------------------------------------------------------------
// Type conversion
// --------------------------------------------------------------------------------------------
private int convertToInt(Object o, int defaultValue) {
if (o.getClass() == Integer.class) {
return (Integer) o;
}
else if (o.getClass() == Long.class) {
long value = (Long) o;
if (value <= Integer.MAX_VALUE && value >= Integer.MIN_VALUE) {
return (int) value;
} else {
LOG.warn("Configuration value {} overflows/underflows the integer type.", value);
return defaultValue;
}
}
else {
try {
return Integer.parseInt(o.toString());
}
catch (NumberFormatException e) {
LOG.warn("Configuration cannot evaluate value {} as an integer number", o);
return defaultValue;
}
}
}
private long convertToLong(Object o, long defaultValue) {
if (o.getClass() == Long.class) {
return (Long) o;
}
else if (o.getClass() == Integer.class) {
return ((Integer) o).longValue();
}
else {
try {
return Long.parseLong(o.toString());
}
catch (NumberFormatException e) {
LOG.warn("Configuration cannot evaluate value " + o + " as a long integer number");
return defaultValue;
}
}
}
private boolean convertToBoolean(Object o) {
if (o.getClass() == Boolean.class) {
return (Boolean) o;
}
else {
return Boolean.parseBoolean(o.toString());
}
}
private float convertToFloat(Object o, float defaultValue) {
if (o.getClass() == Float.class) {
return (Float) o;
}
else if (o.getClass() == Double.class) {
double value = ((Double) o);
if (value == 0.0
|| (value >= Float.MIN_VALUE && value <= Float.MAX_VALUE)
|| (value >= -Float.MAX_VALUE && value <= -Float.MIN_VALUE)) {
return (float) value;
} else {
LOG.warn("Configuration value {} overflows/underflows the float type.", value);
return defaultValue;
}
}
else {
try {
return Float.parseFloat(o.toString());
}
catch (NumberFormatException e) {
LOG.warn("Configuration cannot evaluate value {} as a float value", o);
return defaultValue;
}
}
}
private double convertToDouble(Object o, double defaultValue) {
if (o.getClass() == Double.class) {
return (Double) o;
}
else if (o.getClass() == Float.class) {
return ((Float) o).doubleValue();
}
else {
try {
return Double.parseDouble(o.toString());
}
catch (NumberFormatException e) {
LOG.warn("Configuration cannot evaluate value {} as a double value", o);
return defaultValue;
}
}
}
// --------------------------------------------------------------------------------------------
// Serialization
// --------------------------------------------------------------------------------------------
@Override
public void read(DataInputView in) throws IOException {
synchronized (this.confData) {
final int numberOfProperties = in.readInt();
for (int i = 0; i < numberOfProperties; i++) {
String key = StringValue.readString(in);
Object value;
byte type = in.readByte();
switch (type) {
case TYPE_STRING:
value = StringValue.readString(in);
break;
case TYPE_INT:
value = in.readInt();
break;
case TYPE_LONG:
value = in.readLong();
break;
case TYPE_FLOAT:
value = in.readFloat();
break;
case TYPE_DOUBLE:
value = in.readDouble();
break;
case TYPE_BOOLEAN:
value = in.readBoolean();
break;
case TYPE_BYTES:
byte[] bytes = new byte[in.readInt()];
in.readFully(bytes);
value = bytes;
break;
default:
throw new IOException("Unrecognized type: " + type);
}
this.confData.put(key, value);
}
}
}
@Override
public void write(final DataOutputView out) throws IOException {
synchronized (this.confData) {
out.writeInt(this.confData.size());
for (Map.Entry entry : this.confData.entrySet()) {
String key = entry.getKey();
Object val = entry.getValue();
StringValue.writeString(key, out);
Class clazz = val.getClass();
if (clazz == String.class) {
out.write(TYPE_STRING);
StringValue.writeString((String) val, out);
}
else if (clazz == Integer.class) {
out.write(TYPE_INT);
out.writeInt((Integer) val);
}
else if (clazz == Long.class) {
out.write(TYPE_LONG);
out.writeLong((Long) val);
}
else if (clazz == Float.class) {
out.write(TYPE_FLOAT);
out.writeFloat((Float) val);
}
else if (clazz == Double.class) {
out.write(TYPE_DOUBLE);
out.writeDouble((Double) val);
}
else if (clazz == byte[].class) {
out.write(TYPE_BYTES);
byte[] bytes = (byte[]) val;
out.writeInt(bytes.length);
out.write(bytes);
}
else if (clazz == Boolean.class) {
out.write(TYPE_BOOLEAN);
out.writeBoolean((Boolean) val);
}
else {
throw new IllegalArgumentException("Unrecognized type");
}
}
}
}
// --------------------------------------------------------------------------------------------
@Override
public int hashCode() {
int hash = 0;
for (String s : this.confData.keySet()) {
hash ^= s.hashCode();
}
return hash;
}
@SuppressWarnings("EqualsBetweenInconvertibleTypes")
@Override
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
else if (obj instanceof Configuration) {
Map otherConf = ((Configuration) obj).confData;
for (Map.Entry e : this.confData.entrySet()) {
Object thisVal = e.getValue();
Object otherVal = otherConf.get(e.getKey());
if (!thisVal.getClass().equals(byte[].class)) {
if (!thisVal.equals(otherVal)) {
return false;
}
} else if (otherVal.getClass().equals(byte[].class)) {
if (!Arrays.equals((byte[]) thisVal, (byte[]) otherVal)) {
return false;
}
} else {
return false;
}
}
return true;
}
else {
return false;
}
}
@Override
public String toString() {
return this.confData.toString();
}
}
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