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// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
// This source code is licensed under both the GPLv2 (found in the
// COPYING file in the root directory) and Apache 2.0 License
// (found in the LICENSE.Apache file in the root directory).
package org.rocksdb;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
/**
* Database with Transaction support
*/
public class TransactionDB extends RocksDB
implements TransactionalDB {
private TransactionDBOptions transactionDbOptions_;
/**
* Private constructor.
*
* @param nativeHandle The native handle of the C++ TransactionDB object
*/
private TransactionDB(final long nativeHandle) {
super(nativeHandle);
}
/**
* Open a TransactionDB, similar to {@link RocksDB#open(Options, String)}.
*
* @param options {@link org.rocksdb.Options} instance.
* @param transactionDbOptions {@link org.rocksdb.TransactionDBOptions}
* instance.
* @param path the path to the rocksdb.
*
* @return a {@link TransactionDB} instance on success, null if the specified
* {@link TransactionDB} can not be opened.
*
* @throws RocksDBException if an error occurs whilst opening the database.
*/
public static TransactionDB open(final Options options,
final TransactionDBOptions transactionDbOptions, final String path)
throws RocksDBException {
final TransactionDB tdb = new TransactionDB(open(options.nativeHandle_,
transactionDbOptions.nativeHandle_, path));
// when non-default Options is used, keeping an Options reference
// in RocksDB can prevent Java to GC during the life-time of
// the currently-created RocksDB.
tdb.storeOptionsInstance(options);
tdb.storeTransactionDbOptions(transactionDbOptions);
return tdb;
}
/**
* Open a TransactionDB, similar to
* {@link RocksDB#open(DBOptions, String, List, List)}.
*
* @param dbOptions {@link org.rocksdb.DBOptions} instance.
* @param transactionDbOptions {@link org.rocksdb.TransactionDBOptions}
* instance.
* @param path the path to the rocksdb.
* @param columnFamilyDescriptors list of column family descriptors
* @param columnFamilyHandles will be filled with ColumnFamilyHandle instances
*
* @return a {@link TransactionDB} instance on success, null if the specified
* {@link TransactionDB} can not be opened.
*
* @throws RocksDBException if an error occurs whilst opening the database.
*/
public static TransactionDB open(final DBOptions dbOptions,
final TransactionDBOptions transactionDbOptions,
final String path,
final List columnFamilyDescriptors,
final List columnFamilyHandles)
throws RocksDBException {
final byte[][] cfNames = new byte[columnFamilyDescriptors.size()][];
final long[] cfOptionHandles = new long[columnFamilyDescriptors.size()];
for (int i = 0; i < columnFamilyDescriptors.size(); i++) {
final ColumnFamilyDescriptor cfDescriptor = columnFamilyDescriptors
.get(i);
cfNames[i] = cfDescriptor.getName();
cfOptionHandles[i] = cfDescriptor.getOptions().nativeHandle_;
}
final long[] handles = open(dbOptions.nativeHandle_,
transactionDbOptions.nativeHandle_, path, cfNames, cfOptionHandles);
final TransactionDB tdb = new TransactionDB(handles[0]);
// when non-default Options is used, keeping an Options reference
// in RocksDB can prevent Java to GC during the life-time of
// the currently-created RocksDB.
tdb.storeOptionsInstance(dbOptions);
tdb.storeTransactionDbOptions(transactionDbOptions);
for (int i = 1; i < handles.length; i++) {
columnFamilyHandles.add(new ColumnFamilyHandle(tdb, handles[i]));
}
return tdb;
}
/**
* This is similar to {@link #close()} except that it
* throws an exception if any error occurs.
*
* This will not fsync the WAL files.
* If syncing is required, the caller must first call {@link #syncWal()}
* or {@link #write(WriteOptions, WriteBatch)} using an empty write batch
* with {@link WriteOptions#setSync(boolean)} set to true.
*
* See also {@link #close()}.
*
* @throws RocksDBException if an error occurs whilst closing.
*/
public void closeE() throws RocksDBException {
if (owningHandle_.compareAndSet(true, false)) {
try {
closeDatabase(nativeHandle_);
} finally {
disposeInternal();
}
}
}
/**
* This is similar to {@link #closeE()} except that it
* silently ignores any errors.
*
* This will not fsync the WAL files.
* If syncing is required, the caller must first call {@link #syncWal()}
* or {@link #write(WriteOptions, WriteBatch)} using an empty write batch
* with {@link WriteOptions#setSync(boolean)} set to true.
*
* See also {@link #close()}.
*/
@Override
public void close() {
if (owningHandle_.compareAndSet(true, false)) {
try {
closeDatabase(nativeHandle_);
} catch (final RocksDBException e) {
// silently ignore the error report
} finally {
disposeInternal();
}
}
}
@Override
public Transaction beginTransaction(final WriteOptions writeOptions) {
return new Transaction(this, beginTransaction(nativeHandle_,
writeOptions.nativeHandle_));
}
@Override
public Transaction beginTransaction(final WriteOptions writeOptions,
final TransactionOptions transactionOptions) {
return new Transaction(this, beginTransaction(nativeHandle_,
writeOptions.nativeHandle_, transactionOptions.nativeHandle_));
}
// TODO(AR) consider having beingTransaction(... oldTransaction) set a
// reference count inside Transaction, so that we can always call
// Transaction#close but the object is only disposed when there are as many
// closes as beginTransaction. Makes the try-with-resources paradigm easier for
// java developers
@Override
public Transaction beginTransaction(final WriteOptions writeOptions,
final Transaction oldTransaction) {
final long jtxnHandle = beginTransaction_withOld(nativeHandle_,
writeOptions.nativeHandle_, oldTransaction.nativeHandle_);
// RocksJava relies on the assumption that
// we do not allocate a new Transaction object
// when providing an old_txn
assert(jtxnHandle == oldTransaction.nativeHandle_);
return oldTransaction;
}
@Override
public Transaction beginTransaction(final WriteOptions writeOptions,
final TransactionOptions transactionOptions,
final Transaction oldTransaction) {
final long jtxn_handle = beginTransaction_withOld(nativeHandle_,
writeOptions.nativeHandle_, transactionOptions.nativeHandle_,
oldTransaction.nativeHandle_);
// RocksJava relies on the assumption that
// we do not allocate a new Transaction object
// when providing an old_txn
assert(jtxn_handle == oldTransaction.nativeHandle_);
return oldTransaction;
}
public Transaction getTransactionByName(final String transactionName) {
final long jtxnHandle = getTransactionByName(nativeHandle_, transactionName);
if(jtxnHandle == 0) {
return null;
}
final Transaction txn = new Transaction(this, jtxnHandle);
// this instance doesn't own the underlying C++ object
txn.disOwnNativeHandle();
return txn;
}
public List getAllPreparedTransactions() {
final long[] jtxnHandles = getAllPreparedTransactions(nativeHandle_);
final List txns = new ArrayList<>();
for(final long jtxnHandle : jtxnHandles) {
final Transaction txn = new Transaction(this, jtxnHandle);
// this instance doesn't own the underlying C++ object
txn.disOwnNativeHandle();
txns.add(txn);
}
return txns;
}
public static class KeyLockInfo {
private final String key;
private final long[] transactionIDs;
private final boolean exclusive;
public KeyLockInfo(final String key, final long transactionIDs[],
final boolean exclusive) {
this.key = key;
this.transactionIDs = transactionIDs;
this.exclusive = exclusive;
}
/**
* Get the key.
*
* @return the key
*/
public String getKey() {
return key;
}
/**
* Get the Transaction IDs.
*
* @return the Transaction IDs.
*/
public long[] getTransactionIDs() {
return transactionIDs;
}
/**
* Get the Lock status.
*
* @return true if the lock is exclusive, false if the lock is shared.
*/
public boolean isExclusive() {
return exclusive;
}
}
/**
* Returns map of all locks held.
*
* @return a map of all the locks held.
*/
public Map getLockStatusData() {
return getLockStatusData(nativeHandle_);
}
/**
* Called from C++ native method {@link #getDeadlockInfoBuffer(long)}
* to construct a DeadlockInfo object.
*
* @param transactionID The transaction id
* @param columnFamilyId The id of the {@link ColumnFamilyHandle}
* @param waitingKey the key that we are waiting on
* @param exclusive true if the lock is exclusive, false if the lock is shared
*
* @return The waiting transactions
*/
private DeadlockInfo newDeadlockInfo(
final long transactionID, final long columnFamilyId,
final String waitingKey, final boolean exclusive) {
return new DeadlockInfo(transactionID, columnFamilyId,
waitingKey, exclusive);
}
public static class DeadlockInfo {
private final long transactionID;
private final long columnFamilyId;
private final String waitingKey;
private final boolean exclusive;
private DeadlockInfo(final long transactionID, final long columnFamilyId,
final String waitingKey, final boolean exclusive) {
this.transactionID = transactionID;
this.columnFamilyId = columnFamilyId;
this.waitingKey = waitingKey;
this.exclusive = exclusive;
}
/**
* Get the Transaction ID.
*
* @return the transaction ID
*/
public long getTransactionID() {
return transactionID;
}
/**
* Get the Column Family ID.
*
* @return The column family ID
*/
public long getColumnFamilyId() {
return columnFamilyId;
}
/**
* Get the key that we are waiting on.
*
* @return the key that we are waiting on
*/
public String getWaitingKey() {
return waitingKey;
}
/**
* Get the Lock status.
*
* @return true if the lock is exclusive, false if the lock is shared.
*/
public boolean isExclusive() {
return exclusive;
}
}
public static class DeadlockPath {
final DeadlockInfo[] path;
final boolean limitExceeded;
public DeadlockPath(final DeadlockInfo[] path, final boolean limitExceeded) {
this.path = path;
this.limitExceeded = limitExceeded;
}
public boolean isEmpty() {
return path.length == 0 && !limitExceeded;
}
}
public DeadlockPath[] getDeadlockInfoBuffer() {
return getDeadlockInfoBuffer(nativeHandle_);
}
public void setDeadlockInfoBufferSize(final int targetSize) {
setDeadlockInfoBufferSize(nativeHandle_, targetSize);
}
private void storeTransactionDbOptions(
final TransactionDBOptions transactionDbOptions) {
this.transactionDbOptions_ = transactionDbOptions;
}
@Override protected final native void disposeInternal(final long handle);
private static native long open(final long optionsHandle,
final long transactionDbOptionsHandle, final String path)
throws RocksDBException;
private static native long[] open(final long dbOptionsHandle,
final long transactionDbOptionsHandle, final String path,
final byte[][] columnFamilyNames, final long[] columnFamilyOptions);
private native static void closeDatabase(final long handle)
throws RocksDBException;
private native long beginTransaction(final long handle,
final long writeOptionsHandle);
private native long beginTransaction(final long handle,
final long writeOptionsHandle, final long transactionOptionsHandle);
private native long beginTransaction_withOld(final long handle,
final long writeOptionsHandle, final long oldTransactionHandle);
private native long beginTransaction_withOld(final long handle,
final long writeOptionsHandle, final long transactionOptionsHandle,
final long oldTransactionHandle);
private native long getTransactionByName(final long handle,
final String name);
private native long[] getAllPreparedTransactions(final long handle);
private native Map getLockStatusData(
final long handle);
private native DeadlockPath[] getDeadlockInfoBuffer(final long handle);
private native void setDeadlockInfoBufferSize(final long handle,
final int targetSize);
}
