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The MongoDB Java Driver uber-artifact, containing mongodb-driver, mongodb-driver-core, and bson
/*
* Copyright 2008-present MongoDB, Inc.
*
* Licensed 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 com.mongodb.client.internal;
import com.mongodb.ClientSessionOptions;
import com.mongodb.MongoClientException;
import com.mongodb.MongoException;
import com.mongodb.MongoExecutionTimeoutException;
import com.mongodb.MongoInternalException;
import com.mongodb.ReadConcern;
import com.mongodb.TransactionOptions;
import com.mongodb.WriteConcern;
import com.mongodb.client.ClientSession;
import com.mongodb.client.TransactionBody;
import com.mongodb.internal.session.BaseClientSessionImpl;
import com.mongodb.internal.session.ServerSessionPool;
import com.mongodb.operation.AbortTransactionOperation;
import com.mongodb.operation.CommitTransactionOperation;
import static com.mongodb.MongoException.TRANSIENT_TRANSACTION_ERROR_LABEL;
import static com.mongodb.MongoException.UNKNOWN_TRANSACTION_COMMIT_RESULT_LABEL;
import static com.mongodb.assertions.Assertions.isTrue;
import static com.mongodb.assertions.Assertions.notNull;
import static java.util.concurrent.TimeUnit.MILLISECONDS;
final class ClientSessionImpl extends BaseClientSessionImpl implements ClientSession {
private enum TransactionState {
NONE, IN, COMMITTED, ABORTED
}
private static final int MAX_RETRY_TIME_LIMIT_MS = 120000;
private final MongoClientDelegate delegate;
private TransactionState transactionState = TransactionState.NONE;
private boolean messageSentInCurrentTransaction;
private boolean commitInProgress;
private TransactionOptions transactionOptions;
ClientSessionImpl(final ServerSessionPool serverSessionPool, final Object originator, final ClientSessionOptions options,
final MongoClientDelegate delegate) {
super(serverSessionPool, originator, options);
this.delegate = delegate;
}
@Override
public boolean hasActiveTransaction() {
return transactionState == TransactionState.IN || (transactionState == TransactionState.COMMITTED && commitInProgress);
}
@Override
public boolean notifyMessageSent() {
if (hasActiveTransaction()) {
boolean firstMessageInCurrentTransaction = !messageSentInCurrentTransaction;
messageSentInCurrentTransaction = true;
return firstMessageInCurrentTransaction;
} else {
if (transactionState == TransactionState.COMMITTED || transactionState == TransactionState.ABORTED) {
cleanupTransaction(TransactionState.NONE);
}
return false;
}
}
@Override
public TransactionOptions getTransactionOptions() {
isTrue("in transaction", transactionState == TransactionState.IN || transactionState == TransactionState.COMMITTED);
return transactionOptions;
}
@Override
public void startTransaction() {
startTransaction(TransactionOptions.builder().build());
}
@Override
public void startTransaction(final TransactionOptions transactionOptions) {
notNull("transactionOptions", transactionOptions);
if (transactionState == TransactionState.IN) {
throw new IllegalStateException("Transaction already in progress");
}
if (transactionState == TransactionState.COMMITTED) {
cleanupTransaction(TransactionState.IN);
} else {
transactionState = TransactionState.IN;
}
getServerSession().advanceTransactionNumber();
this.transactionOptions = TransactionOptions.merge(transactionOptions, getOptions().getDefaultTransactionOptions());
WriteConcern writeConcern = this.transactionOptions.getWriteConcern();
if (writeConcern == null) {
throw new MongoInternalException("Invariant violated. Transaction options write concern can not be null");
}
if (!writeConcern.isAcknowledged()) {
throw new MongoClientException("Transactions do not support unacknowledged write concern");
}
setPinnedServerAddress(null);
}
@Override
public void commitTransaction() {
if (transactionState == TransactionState.ABORTED) {
throw new IllegalStateException("Cannot call commitTransaction after calling abortTransaction");
}
if (transactionState == TransactionState.NONE) {
throw new IllegalStateException("There is no transaction started");
}
try {
if (messageSentInCurrentTransaction) {
ReadConcern readConcern = transactionOptions.getReadConcern();
if (readConcern == null) {
throw new MongoInternalException("Invariant violated. Transaction options read concern can not be null");
}
commitInProgress = true;
delegate.getOperationExecutor().execute(new CommitTransactionOperation(transactionOptions.getWriteConcern(),
transactionState == TransactionState.COMMITTED)
.recoveryToken(getRecoveryToken())
.maxCommitTime(transactionOptions.getMaxCommitTime(MILLISECONDS), MILLISECONDS),
readConcern, this);
}
} catch (MongoException e) {
unpinServerAddressOnError(e);
throw e;
} finally {
transactionState = TransactionState.COMMITTED;
commitInProgress = false;
}
}
@Override
public void abortTransaction() {
if (transactionState == TransactionState.ABORTED) {
throw new IllegalStateException("Cannot call abortTransaction twice");
}
if (transactionState == TransactionState.COMMITTED) {
throw new IllegalStateException("Cannot call abortTransaction after calling commitTransaction");
}
if (transactionState == TransactionState.NONE) {
throw new IllegalStateException("There is no transaction started");
}
try {
if (messageSentInCurrentTransaction) {
ReadConcern readConcern = transactionOptions.getReadConcern();
if (readConcern == null) {
throw new MongoInternalException("Invariant violated. Transaction options read concern can not be null");
}
delegate.getOperationExecutor().execute(new AbortTransactionOperation(transactionOptions.getWriteConcern())
.recoveryToken(getRecoveryToken()),
readConcern, this);
}
} catch (Exception e) {
if (e instanceof MongoException) {
unpinServerAddressOnError((MongoException) e);
}
} finally {
cleanupTransaction(TransactionState.ABORTED);
}
}
private void unpinServerAddressOnError(final MongoException e) {
if (e.hasErrorLabel(TRANSIENT_TRANSACTION_ERROR_LABEL) || e.hasErrorLabel(UNKNOWN_TRANSACTION_COMMIT_RESULT_LABEL)) {
setPinnedServerAddress(null);
}
}
@Override
public T withTransaction(final TransactionBody transactionBody) {
return withTransaction(TransactionOptions.builder().build(), transactionBody);
}
@Override
public T withTransaction(final TransactionOptions options, final TransactionBody transactionBody) {
notNull("transactionBody", transactionBody);
long startTime = ClientSessionClock.INSTANCE.now();
outer:
while (true) {
T retVal;
try {
startTransaction(options);
retVal = transactionBody.execute();
} catch (RuntimeException e) {
if (transactionState == TransactionState.IN) {
abortTransaction();
}
if (e instanceof MongoException) {
if (((MongoException) e).hasErrorLabel(TRANSIENT_TRANSACTION_ERROR_LABEL)
&& ClientSessionClock.INSTANCE.now() - startTime < MAX_RETRY_TIME_LIMIT_MS) {
continue;
}
}
throw e;
}
if (transactionState == TransactionState.IN) {
while (true) {
try {
commitTransaction();
break;
} catch (MongoException e) {
unpinServerAddressOnError(e);
if (ClientSessionClock.INSTANCE.now() - startTime < MAX_RETRY_TIME_LIMIT_MS) {
applyMajorityWriteConcernToTransactionOptions();
if (!(e instanceof MongoExecutionTimeoutException)
&& e.hasErrorLabel(UNKNOWN_TRANSACTION_COMMIT_RESULT_LABEL)) {
continue;
} else if (e.hasErrorLabel(TRANSIENT_TRANSACTION_ERROR_LABEL)) {
continue outer;
}
}
throw e;
}
}
}
return retVal;
}
}
// Apply majority write concern if the commit is to be retried.
private void applyMajorityWriteConcernToTransactionOptions() {
if (transactionOptions != null) {
WriteConcern writeConcern = transactionOptions.getWriteConcern();
if (writeConcern != null) {
transactionOptions = TransactionOptions.merge(TransactionOptions.builder()
.writeConcern(writeConcern.withW("majority")).build(), transactionOptions);
} else {
transactionOptions = TransactionOptions.merge(TransactionOptions.builder()
.writeConcern(WriteConcern.MAJORITY).build(), transactionOptions);
}
} else {
transactionOptions = TransactionOptions.builder().writeConcern(WriteConcern.MAJORITY).build();
}
}
@Override
public void close() {
try {
if (transactionState == TransactionState.IN) {
abortTransaction();
}
} finally {
super.close();
}
}
private void cleanupTransaction(final TransactionState nextState) {
messageSentInCurrentTransaction = false;
transactionOptions = null;
transactionState = nextState;
}
}
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