/*
* 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.cassandra.utils;
import java.io.*;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.math.BigInteger;
import java.net.InetAddress;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.net.URL;
import java.net.UnknownHostException;
import java.nio.ByteBuffer;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.*;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;
import com.google.common.base.Joiner;
import com.google.common.collect.AbstractIterator;
import org.apache.commons.lang.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.cassandra.cache.IRowCacheProvider;
import org.apache.cassandra.exceptions.ConfigurationException;
import org.apache.cassandra.config.DatabaseDescriptor;
import org.apache.cassandra.db.DecoratedKey;
import org.apache.cassandra.dht.IPartitioner;
import org.apache.cassandra.dht.Range;
import org.apache.cassandra.dht.Token;
import org.apache.cassandra.io.IVersionedSerializer;
import org.apache.cassandra.io.util.DataOutputBuffer;
import org.apache.cassandra.net.IAsyncResult;
import org.apache.thrift.TBase;
import org.apache.thrift.TDeserializer;
import org.apache.thrift.TException;
import org.apache.thrift.TSerializer;
import org.codehaus.jackson.JsonFactory;
import org.codehaus.jackson.map.ObjectMapper;
public class FBUtilities
{
private static final Logger logger = LoggerFactory.getLogger(FBUtilities.class);
private static ObjectMapper jsonMapper = new ObjectMapper(new JsonFactory());
public static final BigInteger TWO = new BigInteger("2");
private static volatile InetAddress localInetAddress;
private static volatile InetAddress broadcastInetAddress;
public static int getAvailableProcessors()
{
if (System.getProperty("cassandra.available_processors") != null)
return Integer.parseInt(System.getProperty("cassandra.available_processors"));
else
return Runtime.getRuntime().availableProcessors();
}
private static final ThreadLocal<MessageDigest> localMD5Digest = new ThreadLocal<MessageDigest>()
{
@Override
protected MessageDigest initialValue()
{
return newMessageDigest("MD5");
}
@Override
public MessageDigest get()
{
MessageDigest digest = super.get();
digest.reset();
return digest;
}
};
private static final ThreadLocal<Random> localRandom = new ThreadLocal<Random>()
{
@Override
protected Random initialValue()
{
return new Random();
}
};
public static final int MAX_UNSIGNED_SHORT = 0xFFFF;
public static MessageDigest threadLocalMD5Digest()
{
return localMD5Digest.get();
}
public static MessageDigest newMessageDigest(String algorithm)
{
try
{
return MessageDigest.getInstance(algorithm);
}
catch (NoSuchAlgorithmException nsae)
{
throw new RuntimeException("the requested digest algorithm (" + algorithm + ") is not available", nsae);
}
}
public static Random threadLocalRandom()
{
return localRandom.get();
}
/**
* Please use getBroadcastAddress instead. You need this only when you have to listen/connect.
*/
public static InetAddress getLocalAddress()
{
if (localInetAddress == null)
try
{
localInetAddress = DatabaseDescriptor.getListenAddress() == null
? InetAddress.getLocalHost()
: DatabaseDescriptor.getListenAddress();
}
catch (UnknownHostException e)
{
throw new RuntimeException(e);
}
return localInetAddress;
}
public static InetAddress getBroadcastAddress()
{
if (broadcastInetAddress == null)
broadcastInetAddress = DatabaseDescriptor.getBroadcastAddress() == null
? getLocalAddress()
: DatabaseDescriptor.getBroadcastAddress();
return broadcastInetAddress;
}
public static Collection<InetAddress> getAllLocalAddresses()
{
Set<InetAddress> localAddresses = new HashSet<InetAddress>();
try
{
Enumeration<NetworkInterface> nets = NetworkInterface.getNetworkInterfaces();
if (nets != null)
{
while (nets.hasMoreElements())
localAddresses.addAll(Collections.list(nets.nextElement().getInetAddresses()));
}
}
catch (SocketException e)
{
throw new AssertionError(e);
}
return localAddresses;
}
/**
* Given two bit arrays represented as BigIntegers, containing the given
* number of significant bits, calculate a midpoint.
*
* @param left The left point.
* @param right The right point.
* @param sigbits The number of bits in the points that are significant.
* @return A midpoint that will compare bitwise halfway between the params, and
* a boolean representing whether a non-zero lsbit remainder was generated.
*/
public static Pair<BigInteger,Boolean> midpoint(BigInteger left, BigInteger right, int sigbits)
{
BigInteger midpoint;
boolean remainder;
if (left.compareTo(right) < 0)
{
BigInteger sum = left.add(right);
remainder = sum.testBit(0);
midpoint = sum.shiftRight(1);
}
else
{
BigInteger max = TWO.pow(sigbits);
// wrapping case
BigInteger distance = max.add(right).subtract(left);
remainder = distance.testBit(0);
midpoint = distance.shiftRight(1).add(left).mod(max);
}
return Pair.create(midpoint, remainder);
}
public static int compareUnsigned(byte[] bytes1, byte[] bytes2, int offset1, int offset2, int len1, int len2)
{
return FastByteComparisons.compareTo(bytes1, offset1, len1, bytes2, offset2, len2);
}
/**
* @return The bitwise XOR of the inputs. The output will be the same length as the
* longer input, but if either input is null, the output will be null.
*/
public static byte[] xor(byte[] left, byte[] right)
{
if (left == null || right == null)
return null;
if (left.length > right.length)
{
byte[] swap = left;
left = right;
right = swap;
}
// left.length is now <= right.length
byte[] out = Arrays.copyOf(right, right.length);
for (int i = 0; i < left.length; i++)
{
out[i] = (byte)((left[i] & 0xFF) ^ (right[i] & 0xFF));
}
return out;
}
public static BigInteger hashToBigInteger(ByteBuffer data)
{
byte[] result = hash(data);
BigInteger hash = new BigInteger(result);
return hash.abs();
}
public static byte[] hash(ByteBuffer... data)
{
MessageDigest messageDigest = localMD5Digest.get();
for (ByteBuffer block : data)
{
if (block.hasArray())
messageDigest.update(block.array(), block.arrayOffset() + block.position(), block.remaining());
else
messageDigest.update(block.duplicate());
}
return messageDigest.digest();
}
@Deprecated
public static void serialize(TSerializer serializer, TBase struct, DataOutput out)
throws IOException
{
assert serializer != null;
assert struct != null;
assert out != null;
byte[] bytes;
try
{
bytes = serializer.serialize(struct);
}
catch (TException e)
{
throw new RuntimeException(e);
}
out.writeInt(bytes.length);
out.write(bytes);
}
@Deprecated
public static void deserialize(TDeserializer deserializer, TBase struct, DataInput in)
throws IOException
{
assert deserializer != null;
assert struct != null;
assert in != null;
byte[] bytes = new byte[in.readInt()];
in.readFully(bytes);
try
{
deserializer.deserialize(struct, bytes);
}
catch (TException ex)
{
throw new IOException(ex);
}
}
public static void sortSampledKeys(List<DecoratedKey> keys, Range<Token> range)
{
if (range.left.compareTo(range.right) >= 0)
{
// range wraps. have to be careful that we sort in the same order as the range to find the right midpoint.
final Token right = range.right;
Comparator<DecoratedKey> comparator = new Comparator<DecoratedKey>()
{
public int compare(DecoratedKey o1, DecoratedKey o2)
{
if ((right.compareTo(o1.token) < 0 && right.compareTo(o2.token) < 0)
|| (right.compareTo(o1.token) > 0 && right.compareTo(o2.token) > 0))
{
// both tokens are on the same side of the wrap point
return o1.compareTo(o2);
}
return o2.compareTo(o1);
}
};
Collections.sort(keys, comparator);
}
else
{
// unwrapped range (left < right). standard sort is all we need.
Collections.sort(keys);
}
}
public static String resourceToFile(String filename) throws ConfigurationException
{
ClassLoader loader = FBUtilities.class.getClassLoader();
URL scpurl = loader.getResource(filename);
if (scpurl == null)
throw new ConfigurationException("unable to locate " + filename);
return scpurl.getFile();
}
public static String getReleaseVersionString()
{
try
{
InputStream in = FBUtilities.class.getClassLoader().getResourceAsStream("org/apache/cassandra/config/version.properties");
if (in == null)
{
return "Unknown";
}
Properties props = new Properties();
props.load(in);
return props.getProperty("CassandraVersion");
}
catch (Exception e)
{
logger.warn("Unable to load version.properties", e);
return "debug version";
}
}
public static long timestampMicros()
{
// we use microsecond resolution for compatibility with other client libraries, even though
// we can't actually get microsecond precision.
return System.currentTimeMillis() * 1000;
}
public static void waitOnFutures(Iterable<Future<?>> futures)
{
for (Future f : futures)
waitOnFuture(f);
}
public static void waitOnFuture(Future<?> future)
{
try
{
future.get();
}
catch (ExecutionException ee)
{
throw new RuntimeException(ee);
}
catch (InterruptedException ie)
{
throw new AssertionError(ie);
}
}
public static void waitOnFutures(List<IAsyncResult> results, long ms) throws TimeoutException
{
for (IAsyncResult result : results)
result.get(ms, TimeUnit.MILLISECONDS);
}
public static IPartitioner newPartitioner(String partitionerClassName) throws ConfigurationException
{
if (!partitionerClassName.contains("."))
partitionerClassName = "org.apache.cassandra.dht." + partitionerClassName;
return FBUtilities.construct(partitionerClassName, "partitioner");
}
/**
* @return The Class for the given name.
* @param classname Fully qualified classname.
* @param readable Descriptive noun for the role the class plays.
* @throws ConfigurationException If the class cannot be found.
*/
public static <T> Class<T> classForName(String classname, String readable) throws ConfigurationException
{
try
{
return (Class<T>)Class.forName(classname);
}
catch (ClassNotFoundException e)
{
throw new ConfigurationException(String.format("Unable to find %s class '%s'", readable, classname));
}
catch (NoClassDefFoundError e)
{
throw new ConfigurationException(String.format("Unable to find %s class '%s'", readable, classname));
}
}
/**
* Constructs an instance of the given class, which must have a no-arg constructor.
* @param classname Fully qualified classname.
* @param readable Descriptive noun for the role the class plays.
* @throws ConfigurationException If the class cannot be found.
*/
public static <T> T construct(String classname, String readable) throws ConfigurationException
{
Class<T> cls = FBUtilities.classForName(classname, readable);
try
{
return cls.getConstructor().newInstance();
}
catch (NoSuchMethodException e)
{
throw new ConfigurationException(String.format("No default constructor for %s class '%s'.", readable, classname));
}
catch (IllegalAccessException e)
{
throw new ConfigurationException(String.format("Default constructor for %s class '%s' is inaccessible.", readable, classname));
}
catch (InstantiationException e)
{
throw new ConfigurationException(String.format("Cannot use abstract class '%s' as %s.", classname, readable));
}
catch (InvocationTargetException e)
{
if (e.getCause() instanceof ConfigurationException)
throw (ConfigurationException)e.getCause();
throw new ConfigurationException(String.format("Error instantiating %s class '%s'.", readable, classname), e);
}
}
public static <T extends Comparable> SortedSet<T> singleton(T column)
{
return new TreeSet<T>(Arrays.asList(column));
}
public static String toString(Map<?,?> map)
{
Joiner.MapJoiner joiner = Joiner.on(", ").withKeyValueSeparator(":");
return joiner.join(map);
}
/**
* Used to get access to protected/private field of the specified class
* @param klass - name of the class
* @param fieldName - name of the field
* @return Field or null on error
*/
public static Field getProtectedField(Class klass, String fieldName)
{
Field field;
try
{
field = klass.getDeclaredField(fieldName);
field.setAccessible(true);
}
catch (Exception e)
{
throw new AssertionError(e);
}
return field;
}
public static IRowCacheProvider newCacheProvider(String cache_provider) throws ConfigurationException
{
if (!cache_provider.contains("."))
cache_provider = "org.apache.cassandra.cache." + cache_provider;
return FBUtilities.construct(cache_provider, "row cache provider");
}
public static <T> CloseableIterator<T> closeableIterator(Iterator<T> iterator)
{
return new WrappedCloseableIterator<T>(iterator);
}
public static Map<String, String> fromJsonMap(String json)
{
try
{
return jsonMapper.readValue(json, Map.class);
}
catch (IOException e)
{
throw new RuntimeException(e);
}
}
public static List<String> fromJsonList(String json)
{
try
{
return jsonMapper.readValue(json, List.class);
}
catch (IOException e)
{
throw new RuntimeException(e);
}
}
public static String json(Object object)
{
try
{
return jsonMapper.writeValueAsString(object);
}
catch (IOException e)
{
throw new RuntimeException(e);
}
}
/**
* Starts and waits for the given @param pb to finish.
* @throws java.io.IOException on non-zero exit code
*/
public static void exec(ProcessBuilder pb) throws IOException
{
Process p = pb.start();
try
{
int errCode = p.waitFor();
if (errCode != 0)
{
BufferedReader in = new BufferedReader(new InputStreamReader(p.getInputStream()));
BufferedReader err = new BufferedReader(new InputStreamReader(p.getErrorStream()));
StringBuilder sb = new StringBuilder();
String str;
while ((str = in.readLine()) != null)
sb.append(str).append(System.getProperty("line.separator"));
while ((str = err.readLine()) != null)
sb.append(str).append(System.getProperty("line.separator"));
throw new IOException("Exception while executing the command: "+ StringUtils.join(pb.command(), " ") +
", command error Code: " + errCode +
", command output: "+ sb.toString());
}
}
catch (InterruptedException e)
{
throw new AssertionError(e);
}
}
public static void sleep(int millis)
{
try
{
Thread.sleep(millis);
}
catch (InterruptedException e)
{
throw new AssertionError();
}
}
private static final class WrappedCloseableIterator<T>
extends AbstractIterator<T> implements CloseableIterator<T>
{
private final Iterator<T> source;
public WrappedCloseableIterator(Iterator<T> source)
{
this.source = source;
}
protected T computeNext()
{
if (!source.hasNext())
return endOfData();
return source.next();
}
public void close() {}
}
public static <T> byte[] serialize(T object, IVersionedSerializer<T> serializer, int version) throws IOException
{
int size = (int) serializer.serializedSize(object, version);
DataOutputBuffer buffer = new DataOutputBuffer(size);
serializer.serialize(object, buffer, version);
assert buffer.getLength() == size && buffer.getData().length == size
: String.format("Final buffer length %s to accommodate data size of %s (predicted %s) for %s",
buffer.getData().length, buffer.getLength(), size, object);
return buffer.getData();
}
}