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The MongoDB Java Driver uber-artifact, containing the legacy driver, the 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.MongoCredential;
import com.mongodb.MongoException;
import com.mongodb.MongoInternalException;
import com.mongodb.MongoSocketException;
import com.mongodb.MongoTimeoutException;
import com.mongodb.ReadConcern;
import com.mongodb.ReadPreference;
import com.mongodb.ServerAddress;
import com.mongodb.TransactionOptions;
import com.mongodb.WriteConcern;
import com.mongodb.binding.ClusterBinding;
import com.mongodb.binding.ReadBinding;
import com.mongodb.binding.ReadWriteBinding;
import com.mongodb.binding.WriteBinding;
import com.mongodb.client.ClientSession;
import com.mongodb.connection.Cluster;
import com.mongodb.connection.ClusterConnectionMode;
import com.mongodb.connection.ClusterDescription;
import com.mongodb.connection.ClusterType;
import com.mongodb.connection.ServerDescription;
import com.mongodb.internal.session.ServerSessionPool;
import com.mongodb.lang.Nullable;
import com.mongodb.operation.ReadOperation;
import com.mongodb.operation.WriteOperation;
import com.mongodb.selector.ServerSelector;
import java.util.ArrayList;
import java.util.List;
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.isTrue;
import static com.mongodb.assertions.Assertions.notNull;
/**
* This class is not part of the public API and may be removed or changed at any time.
*/
public class MongoClientDelegate {
private final Cluster cluster;
private final ServerSessionPool serverSessionPool;
private final List credentialList;
private final Object originator;
private final OperationExecutor operationExecutor;
public MongoClientDelegate(final Cluster cluster, final List credentialList, final Object originator) {
this(cluster, credentialList, originator, null);
}
public MongoClientDelegate(final Cluster cluster, final List credentialList, final Object originator,
@Nullable final OperationExecutor operationExecutor) {
this.cluster = cluster;
this.serverSessionPool = new ServerSessionPool(cluster);
this.credentialList = credentialList;
this.originator = originator;
this.operationExecutor = operationExecutor == null ? new DelegateOperationExecutor() : operationExecutor;
}
public OperationExecutor getOperationExecutor() {
return operationExecutor;
}
@Nullable
public ClientSession createClientSession(final ClientSessionOptions options, final ReadConcern readConcern,
final WriteConcern writeConcern, final ReadPreference readPreference) {
notNull("readConcern", readConcern);
notNull("writeConcern", writeConcern);
notNull("readPreference", readPreference);
if (credentialList.size() > 1) {
return null;
}
ClusterDescription connectedClusterDescription = getConnectedClusterDescription();
if (connectedClusterDescription.getType() == ClusterType.STANDALONE
|| connectedClusterDescription.getLogicalSessionTimeoutMinutes() == null) {
return null;
} else {
ClientSessionOptions mergedOptions = ClientSessionOptions.builder(options)
.defaultTransactionOptions(
TransactionOptions.merge(
options.getDefaultTransactionOptions(),
TransactionOptions.builder()
.readConcern(readConcern)
.writeConcern(writeConcern)
.readPreference(readPreference)
.build()))
.build();
return new ClientSessionImpl(serverSessionPool, originator, mergedOptions, this);
}
}
public List getServerAddressList() {
List serverAddresses = new ArrayList();
for (final ServerDescription cur : cluster.getDescription().getServerDescriptions()) {
serverAddresses.add(cur.getAddress());
}
return serverAddresses;
}
public void close() {
serverSessionPool.close();
cluster.close();
}
public Cluster getCluster() {
return cluster;
}
public ServerSessionPool getServerSessionPool() {
return serverSessionPool;
}
private ClusterDescription getConnectedClusterDescription() {
ClusterDescription clusterDescription = cluster.getDescription();
if (getServerDescriptionListToConsiderForSessionSupport(clusterDescription).isEmpty()) {
cluster.selectServer(new ServerSelector() {
@Override
public List select(final ClusterDescription clusterDescription) {
return getServerDescriptionListToConsiderForSessionSupport(clusterDescription);
}
});
clusterDescription = cluster.getDescription();
}
return clusterDescription;
}
@SuppressWarnings("deprecation")
private List getServerDescriptionListToConsiderForSessionSupport(final ClusterDescription clusterDescription) {
if (clusterDescription.getConnectionMode() == ClusterConnectionMode.SINGLE) {
return clusterDescription.getAny();
} else {
return clusterDescription.getAnyPrimaryOrSecondary();
}
}
private class DelegateOperationExecutor implements OperationExecutor {
@Override
public T execute(final ReadOperation operation, final ReadPreference readPreference, final ReadConcern readConcern) {
return execute(operation, readPreference, readConcern, null);
}
@Override
public T execute(final WriteOperation operation, final ReadConcern readConcern) {
return execute(operation, readConcern, null);
}
@Override
public T execute(final ReadOperation operation, final ReadPreference readPreference, final ReadConcern readConcern,
@Nullable final ClientSession session) {
ClientSession actualClientSession = getClientSession(session);
ReadBinding binding = getReadBinding(readPreference, readConcern, actualClientSession,
session == null && actualClientSession != null);
try {
if (session != null && session.hasActiveTransaction() && !binding.getReadPreference().equals(primary())) {
throw new MongoClientException("Read preference in a transaction must be primary");
}
return operation.execute(binding);
} catch (MongoException e) {
labelException(session, e);
throw e;
} finally {
binding.release();
}
}
@Override
public T execute(final WriteOperation operation, final ReadConcern readConcern, @Nullable final ClientSession session) {
ClientSession actualClientSession = getClientSession(session);
WriteBinding binding = getWriteBinding(readConcern, actualClientSession, session == null && actualClientSession != null);
try {
return operation.execute(binding);
} catch (MongoException e) {
labelException(session, e);
throw e;
} finally {
binding.release();
}
}
WriteBinding getWriteBinding(final ReadConcern readConcern, @Nullable final ClientSession session, final boolean ownsSession) {
return getReadWriteBinding(primary(), readConcern, session, ownsSession);
}
ReadBinding getReadBinding(final ReadPreference readPreference, final ReadConcern readConcern,
@Nullable final ClientSession session, final boolean ownsSession) {
return getReadWriteBinding(readPreference, readConcern, session, ownsSession);
}
ReadWriteBinding getReadWriteBinding(final ReadPreference readPreference, final ReadConcern readConcern,
@Nullable final ClientSession session, final boolean ownsSession) {
ReadWriteBinding readWriteBinding = new ClusterBinding(cluster, getReadPreferenceForBinding(readPreference, session),
readConcern);
if (session != null) {
readWriteBinding = new ClientSessionBinding(session, ownsSession, readWriteBinding);
}
return readWriteBinding;
}
private void labelException(final @Nullable ClientSession session, final MongoException e) {
if ((e instanceof MongoSocketException || e instanceof MongoTimeoutException)
&& session != null && session.hasActiveTransaction() && !e.hasErrorLabel(UNKNOWN_TRANSACTION_COMMIT_RESULT_LABEL)) {
e.addLabel(TRANSIENT_TRANSACTION_ERROR_LABEL);
}
}
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;
}
@Nullable
ClientSession getClientSession(@Nullable final ClientSession clientSessionFromOperation) {
ClientSession session;
if (clientSessionFromOperation != null) {
isTrue("ClientSession from same MongoClient", clientSessionFromOperation.getOriginator() == originator);
session = clientSessionFromOperation;
} else {
session = createClientSession(ClientSessionOptions.builder().causallyConsistent(false).build(), ReadConcern.DEFAULT,
WriteConcern.ACKNOWLEDGED, ReadPreference.primary());
}
return session;
}
}
}