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The MongoDB Asynchronous Driver
/*
* 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.async.client;
import com.mongodb.MongoClientException;
import com.mongodb.MongoException;
import com.mongodb.MongoInternalException;
import com.mongodb.MongoQueryException;
import com.mongodb.MongoSocketException;
import com.mongodb.MongoTimeoutException;
import com.mongodb.ReadConcern;
import com.mongodb.ReadPreference;
import com.mongodb.async.SingleResultCallback;
import com.mongodb.async.client.internal.Crypt;
import com.mongodb.async.client.internal.AsyncCryptBinding;
import com.mongodb.binding.AsyncClusterBinding;
import com.mongodb.binding.AsyncReadWriteBinding;
import com.mongodb.diagnostics.logging.Logger;
import com.mongodb.diagnostics.logging.Loggers;
import com.mongodb.internal.binding.AsyncClusterAwareReadWriteBinding;
import com.mongodb.lang.Nullable;
import com.mongodb.operation.AsyncReadOperation;
import com.mongodb.operation.AsyncWriteOperation;
import static com.mongodb.MongoException.TRANSIENT_TRANSACTION_ERROR_LABEL;
import static com.mongodb.MongoException.UNKNOWN_TRANSACTION_COMMIT_RESULT_LABEL;
import static com.mongodb.ReadPreference.primary;
import static com.mongodb.assertions.Assertions.notNull;
import static com.mongodb.internal.async.ErrorHandlingResultCallback.errorHandlingCallback;
class OperationExecutorImpl implements OperationExecutor {
private static final Logger LOGGER = Loggers.getLogger("client");
private final MongoClientImpl mongoClient;
private final ClientSessionHelper clientSessionHelper;
OperationExecutorImpl(final MongoClientImpl mongoClient, final ClientSessionHelper clientSessionHelper) {
this.mongoClient = mongoClient;
this.clientSessionHelper = clientSessionHelper;
}
@Override
public void execute(final AsyncReadOperation operation, final ReadPreference readPreference, final ReadConcern readConcern,
final SingleResultCallback callback) {
execute(operation, readPreference, readConcern, null, callback);
}
@Override
public void execute(final AsyncReadOperation operation, final ReadPreference readPreference, final ReadConcern readConcern,
@Nullable final ClientSession session, final SingleResultCallback callback) {
notNull("operation", operation);
notNull("readPreference", readPreference);
notNull("callback", callback);
final SingleResultCallback errHandlingCallback = errorHandlingCallback(callback, LOGGER);
clientSessionHelper.withClientSession(session, this, new SingleResultCallback(){
@Override
public void onResult(final ClientSession clientSession, final Throwable t) {
if (t != null) {
errHandlingCallback.onResult(null, t);
} else {
getReadWriteBinding(readPreference, readConcern, clientSession,
session == null && clientSession != null,
new SingleResultCallback() {
@Override
public void onResult(final AsyncReadWriteBinding binding, final Throwable t) {
if (t != null) {
errHandlingCallback.onResult(null, t);
} else {
if (session != null && session.hasActiveTransaction()
&& !binding.getReadPreference().equals(primary())) {
binding.release();
errHandlingCallback.onResult(null,
new MongoClientException("Read preference in a transaction must be primary"));
} else {
operation.executeAsync(binding, new SingleResultCallback() {
@Override
public void onResult(final T result, final Throwable t) {
try {
labelException(t, session);
unpinServerAddressOnTransientTransactionError(session, t);
errHandlingCallback.onResult(result, t);
} finally {
binding.release();
}
}
});
}
}
}
});
}
}
});
}
@Override
public void execute(final AsyncWriteOperation operation, final ReadConcern readConcern, final SingleResultCallback callback) {
execute(operation, readConcern, null, callback);
}
@Override
public void execute(final AsyncWriteOperation operation, final ReadConcern readConcern, @Nullable final ClientSession session,
final SingleResultCallback callback) {
notNull("operation", operation);
notNull("callback", callback);
final SingleResultCallback errHandlingCallback = errorHandlingCallback(callback, LOGGER);
clientSessionHelper.withClientSession(session, this, new SingleResultCallback() {
@Override
public void onResult(final ClientSession clientSession, final Throwable t) {
if (t != null) {
errHandlingCallback.onResult(null, t);
} else {
getReadWriteBinding(ReadPreference.primary(), readConcern, clientSession,
session == null && clientSession != null,
new SingleResultCallback() {
@Override
public void onResult(final AsyncReadWriteBinding binding, final Throwable t) {
if (t != null) {
errHandlingCallback.onResult(null, t);
} else {
operation.executeAsync(binding, new SingleResultCallback() {
@Override
public void onResult(final T result, final Throwable t) {
try {
labelException(t, session);
unpinServerAddressOnTransientTransactionError(session, t);
errHandlingCallback.onResult(result, t);
} finally {
binding.release();
}
}
});
}
}
});
}
}
});
}
private void labelException(final Throwable t, final ClientSession session) {
if (session != null && session.hasActiveTransaction()
&& (t instanceof MongoSocketException || t instanceof MongoTimeoutException
|| (t instanceof MongoQueryException && ((MongoQueryException) t).getErrorCode() == 91))
&& !((MongoException) t).hasErrorLabel(UNKNOWN_TRANSACTION_COMMIT_RESULT_LABEL)) {
((MongoException) t).addLabel(TRANSIENT_TRANSACTION_ERROR_LABEL);
}
}
private void unpinServerAddressOnTransientTransactionError(final @Nullable ClientSession session, final Throwable throwable) {
if (session != null && throwable != null && throwable instanceof MongoException
&& ((MongoException) throwable).hasErrorLabel(TRANSIENT_TRANSACTION_ERROR_LABEL)) {
session.setPinnedServerAddress(null);
}
}
private void getReadWriteBinding(final ReadPreference readPreference, final ReadConcern readConcern,
@Nullable final ClientSession session, final boolean ownsSession,
final SingleResultCallback callback) {
notNull("readPreference", readPreference);
AsyncClusterAwareReadWriteBinding readWriteBinding = new AsyncClusterBinding(mongoClient.getCluster(),
getReadPreferenceForBinding(readPreference, session), readConcern);
Crypt crypt = mongoClient.getCrypt();
if (crypt != null) {
readWriteBinding = new AsyncCryptBinding(readWriteBinding, crypt);
}
if (session != null) {
callback.onResult(new ClientSessionBinding(session, ownsSession, readWriteBinding), null);
} else {
callback.onResult(readWriteBinding, null);
}
}
private ReadPreference getReadPreferenceForBinding(final ReadPreference readPreference, @Nullable final ClientSession session) {
if (session == null) {
return readPreference;
}
if (session.hasActiveTransaction()) {
ReadPreference readPreferenceForBinding = session.getTransactionOptions().getReadPreference();
if (readPreferenceForBinding == null) {
throw new MongoInternalException("Invariant violated. Transaction options read preference can not be null");
}
return readPreferenceForBinding;
}
return readPreference;
}
}