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The Java operations layer for the MongoDB Java Driver.
Third parties can wrap this layer to provide custom higher-level APIs
/*
* 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.internal.operation;
import com.mongodb.MongoException;
import com.mongodb.MongoNamespace;
import com.mongodb.WriteConcern;
import com.mongodb.assertions.Assertions;
import com.mongodb.bulk.BulkWriteResult;
import com.mongodb.connection.ConnectionDescription;
import com.mongodb.internal.async.SingleResultCallback;
import com.mongodb.internal.async.function.AsyncCallbackLoop;
import com.mongodb.internal.async.function.AsyncCallbackRunnable;
import com.mongodb.internal.async.function.AsyncCallbackSupplier;
import com.mongodb.internal.async.function.LoopState;
import com.mongodb.internal.async.function.RetryState;
import com.mongodb.internal.async.function.RetryingAsyncCallbackSupplier;
import com.mongodb.internal.async.function.RetryingSyncSupplier;
import com.mongodb.internal.binding.AsyncWriteBinding;
import com.mongodb.internal.binding.WriteBinding;
import com.mongodb.internal.bulk.WriteRequest;
import com.mongodb.internal.connection.AsyncConnection;
import com.mongodb.internal.connection.Connection;
import com.mongodb.internal.connection.MongoWriteConcernWithResponseException;
import com.mongodb.internal.connection.OperationContext;
import com.mongodb.internal.connection.ProtocolHelper;
import com.mongodb.internal.operation.retry.AttachmentKeys;
import com.mongodb.internal.session.SessionContext;
import com.mongodb.internal.validator.NoOpFieldNameValidator;
import com.mongodb.lang.Nullable;
import org.bson.BsonArray;
import org.bson.BsonDocument;
import org.bson.BsonString;
import org.bson.BsonValue;
import org.bson.FieldNameValidator;
import java.util.List;
import java.util.Optional;
import java.util.Set;
import java.util.function.Supplier;
import java.util.stream.Collectors;
import static com.mongodb.assertions.Assertions.assertTrue;
import static com.mongodb.assertions.Assertions.isTrueArgument;
import static com.mongodb.assertions.Assertions.notNull;
import static com.mongodb.internal.async.ErrorHandlingResultCallback.errorHandlingCallback;
import static com.mongodb.internal.operation.AsyncOperationHelper.exceptionTransformingCallback;
import static com.mongodb.internal.operation.AsyncOperationHelper.withAsyncSourceAndConnection;
import static com.mongodb.internal.operation.CommandOperationHelper.addRetryableWriteErrorLabel;
import static com.mongodb.internal.operation.CommandOperationHelper.logRetryExecute;
import static com.mongodb.internal.operation.CommandOperationHelper.transformWriteException;
import static com.mongodb.internal.operation.OperationHelper.LOGGER;
import static com.mongodb.internal.operation.OperationHelper.isRetryableWrite;
import static com.mongodb.internal.operation.OperationHelper.validateWriteRequests;
import static com.mongodb.internal.operation.OperationHelper.validateWriteRequestsAndCompleteIfInvalid;
import static com.mongodb.internal.operation.SyncOperationHelper.withSourceAndConnection;
/**
* An operation to execute a series of write operations in bulk.
*
* This class is not part of the public API and may be removed or changed at any time
*/
public class MixedBulkWriteOperation implements AsyncWriteOperation, WriteOperation {
private static final FieldNameValidator NO_OP_FIELD_NAME_VALIDATOR = new NoOpFieldNameValidator();
private final MongoNamespace namespace;
private final List writeRequests;
private final boolean ordered;
private final boolean retryWrites;
private final WriteConcern writeConcern;
private Boolean bypassDocumentValidation;
private BsonValue comment;
private BsonDocument variables;
public MixedBulkWriteOperation(final MongoNamespace namespace, final List writeRequests,
final boolean ordered, final WriteConcern writeConcern, final boolean retryWrites) {
this.ordered = ordered;
this.namespace = notNull("namespace", namespace);
this.writeRequests = notNull("writes", writeRequests);
this.writeConcern = notNull("writeConcern", writeConcern);
this.retryWrites = retryWrites;
isTrueArgument("writes is not an empty list", !writeRequests.isEmpty());
}
public MongoNamespace getNamespace() {
return namespace;
}
public WriteConcern getWriteConcern() {
return writeConcern;
}
public boolean isOrdered() {
return ordered;
}
public List getWriteRequests() {
return writeRequests;
}
public Boolean getBypassDocumentValidation() {
return bypassDocumentValidation;
}
public MixedBulkWriteOperation bypassDocumentValidation(@Nullable final Boolean bypassDocumentValidation) {
this.bypassDocumentValidation = bypassDocumentValidation;
return this;
}
public BsonValue getComment() {
return comment;
}
public MixedBulkWriteOperation comment(@Nullable final BsonValue comment) {
this.comment = comment;
return this;
}
public MixedBulkWriteOperation let(@Nullable final BsonDocument variables) {
this.variables = variables;
return this;
}
public Boolean getRetryWrites() {
return retryWrites;
}
private Supplier decorateWriteWithRetries(final RetryState retryState, final OperationContext operationContext,
final Supplier writeFunction) {
return new RetryingSyncSupplier<>(retryState, CommandOperationHelper::chooseRetryableWriteException,
this::shouldAttemptToRetryWrite, () -> {
logRetryExecute(retryState, operationContext);
return writeFunction.get();
});
}
private AsyncCallbackSupplier decorateWriteWithRetries(final RetryState retryState, final OperationContext operationContext,
final AsyncCallbackSupplier writeFunction) {
return new RetryingAsyncCallbackSupplier<>(retryState, CommandOperationHelper::chooseRetryableWriteException,
this::shouldAttemptToRetryWrite, callback -> {
logRetryExecute(retryState, operationContext);
writeFunction.get(callback);
});
}
private boolean shouldAttemptToRetryWrite(final RetryState retryState, final Throwable attemptFailure) {
BulkWriteTracker bulkWriteTracker = retryState.attachment(AttachmentKeys.bulkWriteTracker()).orElseThrow(Assertions::fail);
/* A retry predicate is called only if there is at least one more attempt left. Here we maintain attempt counters manually
* and emulate the above contract by returning `false` at the very beginning of the retry predicate. */
if (bulkWriteTracker.lastAttempt()) {
return false;
}
boolean decision = CommandOperationHelper.shouldAttemptToRetryWrite(retryState, attemptFailure);
if (decision) {
/* The attempt counter maintained by `RetryState` is updated after (in the happens-before order) testing a retry predicate,
* and only if the predicate completes normally. Here we maintain attempt counters manually, and we emulate the
* "after completion" part by updating the counter at the very end of the retry predicate. */
bulkWriteTracker.advance();
}
return decision;
}
@Override
public BulkWriteResult execute(final WriteBinding binding) {
/* We cannot use the tracking of attempts built in the `RetryState` class because conceptually we have to maintain multiple attempt
* counters while executing a single bulk write operation:
* - a counter that limits attempts to select server and checkout a connection before we created a batch;
* - a counter per each batch that limits attempts to execute the specific batch.
* Fortunately, these counters do not exist concurrently with each other. While maintaining the counters manually,
* we must adhere to the contract of `RetryingSyncSupplier`. When the retry timeout is implemented, there will be no counters,
* and the code related to the attempt tracking in `BulkWriteTracker` will be removed. */
RetryState retryState = new RetryState();
BulkWriteTracker.attachNew(retryState, retryWrites);
Supplier retryingBulkWrite = decorateWriteWithRetries(retryState, binding.getOperationContext(), () ->
withSourceAndConnection(binding::getWriteConnectionSource, true, (source, connection) -> {
ConnectionDescription connectionDescription = connection.getDescription();
// attach `maxWireVersion` ASAP because it is used to check whether we can retry
retryState.attach(AttachmentKeys.maxWireVersion(), connectionDescription.getMaxWireVersion(), true);
SessionContext sessionContext = binding.getSessionContext();
WriteConcern writeConcern = getAppliedWriteConcern(sessionContext);
if (!isRetryableWrite(retryWrites, getAppliedWriteConcern(sessionContext), connectionDescription, sessionContext)) {
handleMongoWriteConcernWithResponseException(retryState, true);
}
validateWriteRequests(connectionDescription, bypassDocumentValidation, writeRequests, writeConcern);
if (!retryState.attachment(AttachmentKeys.bulkWriteTracker()).orElseThrow(Assertions::fail).batch().isPresent()) {
BulkWriteTracker.attachNew(retryState, BulkWriteBatch.createBulkWriteBatch(namespace,
connectionDescription, ordered, writeConcern,
bypassDocumentValidation, retryWrites, writeRequests, sessionContext, comment, variables));
}
return executeBulkWriteBatch(retryState, binding, connection);
})
);
try {
return retryingBulkWrite.get();
} catch (MongoException e) {
throw transformWriteException(e);
}
}
public void executeAsync(final AsyncWriteBinding binding, final SingleResultCallback callback) {
// see the comment in `execute(WriteBinding)` explaining the manual tracking of attempts
RetryState retryState = new RetryState();
BulkWriteTracker.attachNew(retryState, retryWrites);
binding.retain();
AsyncCallbackSupplier retryingBulkWrite = this.decorateWriteWithRetries(retryState,
binding.getOperationContext(),
funcCallback ->
withAsyncSourceAndConnection(binding::getWriteConnectionSource, true, funcCallback,
(source, connection, releasingCallback) -> {
ConnectionDescription connectionDescription = connection.getDescription();
// attach `maxWireVersion` ASAP because it is used to check whether we can retry
retryState.attach(AttachmentKeys.maxWireVersion(), connectionDescription.getMaxWireVersion(), true);
SessionContext sessionContext = binding.getSessionContext();
WriteConcern writeConcern = getAppliedWriteConcern(sessionContext);
if (!isRetryableWrite(retryWrites, getAppliedWriteConcern(sessionContext), connectionDescription, sessionContext)
&& handleMongoWriteConcernWithResponseExceptionAsync(retryState, releasingCallback)) {
return;
}
if (validateWriteRequestsAndCompleteIfInvalid(connectionDescription, bypassDocumentValidation, writeRequests,
writeConcern, releasingCallback)) {
return;
}
try {
if (!retryState.attachment(AttachmentKeys.bulkWriteTracker()).orElseThrow(Assertions::fail).batch().isPresent()) {
BulkWriteTracker.attachNew(retryState, BulkWriteBatch.createBulkWriteBatch(namespace,
connectionDescription, ordered, writeConcern,
bypassDocumentValidation, retryWrites, writeRequests, sessionContext, comment, variables));
}
} catch (Throwable t) {
releasingCallback.onResult(null, t);
return;
}
executeBulkWriteBatchAsync(retryState, binding, connection, releasingCallback);
})
).whenComplete(binding::release);
retryingBulkWrite.get(exceptionTransformingCallback(errorHandlingCallback(callback, LOGGER)));
}
private BulkWriteResult executeBulkWriteBatch(final RetryState retryState, final WriteBinding binding, final Connection connection) {
BulkWriteTracker currentBulkWriteTracker = retryState.attachment(AttachmentKeys.bulkWriteTracker())
.orElseThrow(Assertions::fail);
BulkWriteBatch currentBatch = currentBulkWriteTracker.batch().orElseThrow(Assertions::fail);
int maxWireVersion = connection.getDescription().getMaxWireVersion();
while (currentBatch.shouldProcessBatch()) {
try {
BsonDocument result = executeCommand(connection, currentBatch, binding);
if (currentBatch.getRetryWrites() && !binding.getSessionContext().hasActiveTransaction()) {
MongoException writeConcernBasedError = ProtocolHelper.createSpecialException(result,
connection.getDescription().getServerAddress(), "errMsg");
if (writeConcernBasedError != null) {
if (currentBulkWriteTracker.lastAttempt()) {
addRetryableWriteErrorLabel(writeConcernBasedError, maxWireVersion);
addErrorLabelsToWriteConcern(result.getDocument("writeConcernError"), writeConcernBasedError.getErrorLabels());
} else if (CommandOperationHelper.shouldAttemptToRetryWrite(retryState, writeConcernBasedError)) {
throw new MongoWriteConcernWithResponseException(writeConcernBasedError, result);
}
}
}
currentBatch.addResult(result);
currentBulkWriteTracker = BulkWriteTracker.attachNext(retryState, currentBatch);
currentBatch = currentBulkWriteTracker.batch().orElseThrow(Assertions::fail);
} catch (MongoException exception) {
if (!retryState.isFirstAttempt() && !(exception instanceof MongoWriteConcernWithResponseException)) {
addRetryableWriteErrorLabel(exception, maxWireVersion);
}
handleMongoWriteConcernWithResponseException(retryState, false);
throw exception;
}
}
try {
return currentBatch.getResult();
} catch (MongoException e) {
retryState.markAsLastAttempt();
throw e;
}
}
private void executeBulkWriteBatchAsync(final RetryState retryState, final AsyncWriteBinding binding, final AsyncConnection connection,
final SingleResultCallback callback) {
LoopState loopState = new LoopState();
AsyncCallbackRunnable loop = new AsyncCallbackLoop(loopState, iterationCallback -> {
BulkWriteTracker currentBulkWriteTracker = retryState.attachment(AttachmentKeys.bulkWriteTracker())
.orElseThrow(Assertions::fail);
loopState.attach(AttachmentKeys.bulkWriteTracker(), currentBulkWriteTracker, true);
BulkWriteBatch currentBatch = currentBulkWriteTracker.batch().orElseThrow(Assertions::fail);
int maxWireVersion = connection.getDescription().getMaxWireVersion();
if (loopState.breakAndCompleteIf(() -> !currentBatch.shouldProcessBatch(), iterationCallback)) {
return;
}
executeCommandAsync(binding, connection, currentBatch, (result, t) -> {
if (t == null) {
if (currentBatch.getRetryWrites() && !binding.getSessionContext().hasActiveTransaction()) {
MongoException writeConcernBasedError = ProtocolHelper.createSpecialException(result,
connection.getDescription().getServerAddress(), "errMsg");
if (writeConcernBasedError != null) {
if (currentBulkWriteTracker.lastAttempt()) {
addRetryableWriteErrorLabel(writeConcernBasedError, maxWireVersion);
addErrorLabelsToWriteConcern(result.getDocument("writeConcernError"),
writeConcernBasedError.getErrorLabels());
} else if (CommandOperationHelper.shouldAttemptToRetryWrite(retryState, writeConcernBasedError)) {
iterationCallback.onResult(null,
new MongoWriteConcernWithResponseException(writeConcernBasedError, result));
return;
}
}
}
currentBatch.addResult(result);
BulkWriteTracker.attachNext(retryState, currentBatch);
iterationCallback.onResult(null, null);
} else {
if (t instanceof MongoException) {
MongoException exception = (MongoException) t;
if (!retryState.isFirstAttempt() && !(exception instanceof MongoWriteConcernWithResponseException)) {
addRetryableWriteErrorLabel(exception, maxWireVersion);
}
if (handleMongoWriteConcernWithResponseExceptionAsync(retryState, null)) {
return;
}
}
iterationCallback.onResult(null, t);
}
});
});
loop.run((voidResult, t) -> {
if (t != null) {
callback.onResult(null, t);
} else {
BulkWriteResult result;
try {
result = loopState.attachment(AttachmentKeys.bulkWriteTracker())
.flatMap(BulkWriteTracker::batch).orElseThrow(Assertions::fail).getResult();
} catch (Throwable loopResultT) {
if (loopResultT instanceof MongoException) {
retryState.markAsLastAttempt();
}
callback.onResult(null, loopResultT);
return;
}
callback.onResult(result, null);
}
});
}
private void handleMongoWriteConcernWithResponseException(final RetryState retryState, final boolean breakAndThrowIfDifferent) {
if (!retryState.isFirstAttempt()) {
RuntimeException prospectiveFailedResult = (RuntimeException) retryState.exception().orElse(null);
boolean prospectiveResultIsWriteConcernException = prospectiveFailedResult instanceof MongoWriteConcernWithResponseException;
retryState.breakAndThrowIfRetryAnd(() -> breakAndThrowIfDifferent && !prospectiveResultIsWriteConcernException);
if (prospectiveResultIsWriteConcernException) {
retryState.attachment(AttachmentKeys.bulkWriteTracker()).orElseThrow(Assertions::fail)
.batch().ifPresent(bulkWriteBatch -> {
bulkWriteBatch.addResult(
(BsonDocument) ((MongoWriteConcernWithResponseException) prospectiveFailedResult).getResponse());
BulkWriteTracker.attachNext(retryState, bulkWriteBatch);
});
}
}
}
private boolean handleMongoWriteConcernWithResponseExceptionAsync(final RetryState retryState,
@Nullable final SingleResultCallback callback) {
if (!retryState.isFirstAttempt()) {
RuntimeException prospectiveFailedResult = (RuntimeException) retryState.exception().orElse(null);
boolean prospectiveResultIsWriteConcernException = prospectiveFailedResult instanceof MongoWriteConcernWithResponseException;
if (callback != null && retryState.breakAndCompleteIfRetryAnd(() -> !prospectiveResultIsWriteConcernException, callback)) {
return true;
}
if (prospectiveResultIsWriteConcernException) {
retryState.attachment(AttachmentKeys.bulkWriteTracker()).orElseThrow(Assertions::fail)
.batch().ifPresent(bulkWriteBatch -> {
bulkWriteBatch.addResult(
(BsonDocument) ((MongoWriteConcernWithResponseException) prospectiveFailedResult).getResponse());
BulkWriteTracker.attachNext(retryState, bulkWriteBatch);
});
}
}
return false;
}
@Nullable
private BsonDocument executeCommand(final Connection connection, final BulkWriteBatch batch, final WriteBinding binding) {
return connection.command(namespace.getDatabaseName(), batch.getCommand(), NO_OP_FIELD_NAME_VALIDATOR, null, batch.getDecoder(),
binding, shouldAcknowledge(batch, binding.getSessionContext()), batch.getPayload(), batch.getFieldNameValidator());
}
private void executeCommandAsync(final AsyncWriteBinding binding, final AsyncConnection connection, final BulkWriteBatch batch,
final SingleResultCallback callback) {
connection.commandAsync(namespace.getDatabaseName(), batch.getCommand(), NO_OP_FIELD_NAME_VALIDATOR, null, batch.getDecoder(),
binding, shouldAcknowledge(batch, binding.getSessionContext()), batch.getPayload(), batch.getFieldNameValidator(),
callback);
}
private WriteConcern getAppliedWriteConcern(final SessionContext sessionContext) {
if (sessionContext.hasActiveTransaction()) {
return WriteConcern.ACKNOWLEDGED;
} else {
return writeConcern;
}
}
private boolean shouldAcknowledge(final BulkWriteBatch batch, final SessionContext sessionContext) {
return ordered
? batch.hasAnotherBatch() || getAppliedWriteConcern(sessionContext).isAcknowledged()
: getAppliedWriteConcern(sessionContext).isAcknowledged();
}
private void addErrorLabelsToWriteConcern(final BsonDocument result, final Set errorLabels) {
if (!result.containsKey("errorLabels")) {
result.put("errorLabels", new BsonArray(errorLabels.stream().map(BsonString::new).collect(Collectors.toList())));
}
}
public static final class BulkWriteTracker {
private int attempt;
private final int attempts;
@Nullable
private final BulkWriteBatch batch;
static void attachNew(final RetryState retryState, final boolean retry) {
retryState.attach(AttachmentKeys.bulkWriteTracker(), new BulkWriteTracker(retry, null), false);
}
static void attachNew(final RetryState retryState, final BulkWriteBatch batch) {
attach(retryState, new BulkWriteTracker(batch.getRetryWrites(), batch));
}
static BulkWriteTracker attachNext(final RetryState retryState, final BulkWriteBatch batch) {
BulkWriteBatch nextBatch = batch.getNextBatch();
BulkWriteTracker nextTracker = new BulkWriteTracker(nextBatch.getRetryWrites(), nextBatch);
attach(retryState, nextTracker);
return nextTracker;
}
private static void attach(final RetryState retryState, final BulkWriteTracker tracker) {
retryState.attach(AttachmentKeys.bulkWriteTracker(), tracker, false);
BulkWriteBatch batch = tracker.batch;
if (batch != null) {
retryState.attach(AttachmentKeys.retryableCommandFlag(), batch.getRetryWrites(), false)
.attach(AttachmentKeys.commandDescriptionSupplier(), () -> batch.getPayload().getPayloadType().toString(), false);
}
}
private BulkWriteTracker(final boolean retry, @Nullable final BulkWriteBatch batch) {
attempt = 0;
attempts = retry ? RetryState.RETRIES + 1 : 1;
this.batch = batch;
}
boolean lastAttempt() {
return attempt == attempts - 1;
}
void advance() {
assertTrue(!lastAttempt());
attempt++;
}
Optional batch() {
return Optional.ofNullable(batch);
}
}
}
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