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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.cassandra.io.sstable;
import java.io.File;
import java.io.IOException;
import java.util.*;
import org.apache.cassandra.db.Column;
import org.apache.cassandra.db.ColumnFamily;
import org.apache.cassandra.db.DecoratedKey;
import org.apache.cassandra.db.DeletionInfo;
import org.apache.cassandra.db.IColumn;
import org.apache.cassandra.db.columniterator.OnDiskAtomIterator;
import org.apache.cassandra.utils.ByteBufferUtil;
import org.apache.cassandra.Util;
import static org.junit.Assert.assertEquals;
public class SSTableUtils
{
// first configured table and cf
public static String TABLENAME = "Keyspace1";
public static String CFNAME = "Standard1";
public static ColumnFamily createCF(long mfda, int ldt, IColumn... cols)
{
ColumnFamily cf = ColumnFamily.create(TABLENAME, CFNAME);
cf.delete(new DeletionInfo(mfda, ldt));
for (IColumn col : cols)
cf.addColumn(col);
return cf;
}
public static File tempSSTableFile(String tablename, String cfname) throws IOException
{
return tempSSTableFile(tablename, cfname, 0);
}
public static File tempSSTableFile(String tablename, String cfname, int generation) throws IOException
{
File tempdir = File.createTempFile(tablename, cfname);
if(!tempdir.delete() || !tempdir.mkdir())
throw new IOException("Temporary directory creation failed.");
tempdir.deleteOnExit();
File tabledir = new File(tempdir, tablename);
tabledir.mkdir();
tabledir.deleteOnExit();
File datafile = new File(new Descriptor(tabledir, tablename, cfname, generation, false).filenameFor("Data.db"));
if (!datafile.createNewFile())
throw new IOException("unable to create file " + datafile);
datafile.deleteOnExit();
return datafile;
}
public static void assertContentEquals(SSTableReader lhs, SSTableReader rhs) throws IOException
{
SSTableScanner slhs = lhs.getDirectScanner();
SSTableScanner srhs = rhs.getDirectScanner();
while (slhs.hasNext())
{
OnDiskAtomIterator ilhs = slhs.next();
assert srhs.hasNext() : "LHS contained more rows than RHS";
OnDiskAtomIterator irhs = srhs.next();
assertContentEquals(ilhs, irhs);
}
assert !srhs.hasNext() : "RHS contained more rows than LHS";
}
public static void assertContentEquals(OnDiskAtomIterator lhs, OnDiskAtomIterator rhs) throws IOException
{
assertEquals(lhs.getKey(), rhs.getKey());
// check metadata
ColumnFamily lcf = lhs.getColumnFamily();
ColumnFamily rcf = rhs.getColumnFamily();
if (lcf == null)
{
if (rcf == null)
return;
throw new AssertionError("LHS had no content for " + rhs.getKey());
}
else if (rcf == null)
throw new AssertionError("RHS had no content for " + lhs.getKey());
assertEquals(lcf.deletionInfo(), rcf.deletionInfo());
// iterate columns
while (lhs.hasNext())
{
IColumn clhs = (IColumn)lhs.next();
assert rhs.hasNext() : "LHS contained more columns than RHS for " + lhs.getKey();
IColumn crhs = (IColumn)rhs.next();
assertEquals("Mismatched columns for " + lhs.getKey(), clhs, crhs);
}
assert !rhs.hasNext() : "RHS contained more columns than LHS for " + lhs.getKey();
}
/**
* @return A Context with chainable methods to configure and write a SSTable.
*/
public static Context prepare()
{
return new Context();
}
public static class Context
{
private String ksname = TABLENAME;
private String cfname = CFNAME;
private Descriptor dest = null;
private boolean cleanup = true;
private int generation = 0;
Context() {}
public Context ks(String ksname)
{
this.ksname = ksname;
return this;
}
public Context cf(String cfname)
{
this.cfname = cfname;
return this;
}
/**
* Set an alternate path for the written SSTable: if unset, the SSTable will
* be cleaned up on JVM exit.
*/
public Context dest(Descriptor dest)
{
this.dest = dest;
this.cleanup = false;
return this;
}
/**
* Sets the generation number for the generated SSTable. Ignored if "dest()" is set.
*/
public Context generation(int generation)
{
this.generation = generation;
return this;
}
public SSTableReader write(Set<String> keys) throws IOException
{
Map<String, ColumnFamily> map = new HashMap<String, ColumnFamily>();
for (String key : keys)
{
ColumnFamily cf = ColumnFamily.create(ksname, cfname);
cf.addColumn(new Column(ByteBufferUtil.bytes(key), ByteBufferUtil.bytes(key), 0));
map.put(key, cf);
}
return write(map);
}
public SSTableReader write(SortedMap<DecoratedKey, ColumnFamily> sorted) throws IOException
{
final Iterator<Map.Entry<DecoratedKey, ColumnFamily>> iter = sorted.entrySet().iterator();
return write(sorted.size(), new Appender()
{
@Override
public boolean append(SSTableWriter writer) throws IOException
{
if (!iter.hasNext())
return false;
Map.Entry<DecoratedKey, ColumnFamily> entry = iter.next();
writer.append(entry.getKey(), entry.getValue());
return true;
}
});
}
public SSTableReader write(Map<String, ColumnFamily> entries) throws IOException
{
SortedMap<DecoratedKey, ColumnFamily> sorted = new TreeMap<DecoratedKey, ColumnFamily>();
for (Map.Entry<String, ColumnFamily> entry : entries.entrySet())
sorted.put(Util.dk(entry.getKey()), entry.getValue());
return write(sorted);
}
public SSTableReader write(int expectedSize, Appender appender) throws IOException
{
File datafile = (dest == null) ? tempSSTableFile(ksname, cfname, generation) : new File(dest.filenameFor(Component.DATA));
SSTableWriter writer = new SSTableWriter(datafile.getAbsolutePath(), expectedSize);
long start = System.currentTimeMillis();
while (appender.append(writer)) { /* pass */ }
SSTableReader reader = writer.closeAndOpenReader();
// mark all components for removal
if (cleanup)
for (Component component : reader.components)
new File(reader.descriptor.filenameFor(component)).deleteOnExit();
return reader;
}
}
public static abstract class Appender
{
/** Called with an open writer until it returns false. */
public abstract boolean append(SSTableWriter writer) throws IOException;
}
}