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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.binding;
import com.mongodb.ReadConcern;
import com.mongodb.ReadPreference;
import com.mongodb.async.SingleResultCallback;
import com.mongodb.connection.AsyncConnection;
import com.mongodb.connection.Cluster;
import com.mongodb.connection.Server;
import com.mongodb.connection.ServerDescription;
import com.mongodb.internal.connection.ReadConcernAwareNoOpSessionContext;
import com.mongodb.selector.ReadPreferenceServerSelector;
import com.mongodb.selector.ServerSelector;
import com.mongodb.selector.WritableServerSelector;
import com.mongodb.session.SessionContext;
import static com.mongodb.assertions.Assertions.notNull;
/**
* A simple ReadWriteBinding implementation that supplies write connection sources bound to a possibly different primary each time, and a
* read connection source bound to a possible different server each time.
*
* @since 3.0
*/
@Deprecated
public class AsyncClusterBinding extends AbstractReferenceCounted implements AsyncReadWriteBinding {
private final Cluster cluster;
private final ReadPreference readPreference;
private final ReadConcern readConcern;
/**
* Creates an instance.
*
* @param cluster a non-null Cluster which will be used to select a server to bind to
* @param readPreference a non-null ReadPreference for read operations
* @deprecated Prefer {@link #AsyncClusterBinding(Cluster, ReadPreference, ReadConcern)}
*/
@Deprecated
public AsyncClusterBinding(final Cluster cluster, final ReadPreference readPreference) {
this(cluster, readPreference, ReadConcern.DEFAULT);
}
/**
* Creates an instance.
*
* @param cluster a non-null Cluster which will be used to select a server to bind to
* @param readPreference a non-null ReadPreference for read operations
* @param readConcern a non-null read concern
* @since 3.8
*/
public AsyncClusterBinding(final Cluster cluster, final ReadPreference readPreference, final ReadConcern readConcern) {
this.cluster = notNull("cluster", cluster);
this.readPreference = notNull("readPreference", readPreference);
this.readConcern = (notNull("readConcern", readConcern));
}
@Override
public AsyncReadWriteBinding retain() {
super.retain();
return this;
}
@Override
public ReadPreference getReadPreference() {
return readPreference;
}
@Override
public SessionContext getSessionContext() {
return new ReadConcernAwareNoOpSessionContext(readConcern);
}
@Override
public void getReadConnectionSource(final SingleResultCallback callback) {
getAsyncClusterBindingConnectionSource(new ReadPreferenceServerSelector(readPreference), callback);
}
@Override
public void getWriteConnectionSource(final SingleResultCallback callback) {
getAsyncClusterBindingConnectionSource(new WritableServerSelector(), callback);
}
private void getAsyncClusterBindingConnectionSource(final ServerSelector serverSelector,
final SingleResultCallback callback) {
cluster.selectServerAsync(serverSelector, new SingleResultCallback() {
@Override
public void onResult(final Server result, final Throwable t) {
if (t != null) {
callback.onResult(null, t);
} else {
callback.onResult(new AsyncClusterBindingConnectionSource(result), null);
}
}
});
}
private final class AsyncClusterBindingConnectionSource extends AbstractReferenceCounted implements AsyncConnectionSource {
private final Server server;
private AsyncClusterBindingConnectionSource(final Server server) {
this.server = server;
AsyncClusterBinding.this.retain();
}
@Override
public ServerDescription getServerDescription() {
return server.getDescription();
}
@Override
public SessionContext getSessionContext() {
return new ReadConcernAwareNoOpSessionContext(readConcern);
}
@Override
public void getConnection(final SingleResultCallback callback) {
server.getConnectionAsync(callback);
}
public AsyncConnectionSource retain() {
super.retain();
AsyncClusterBinding.this.retain();
return this;
}
@Override
public void release() {
super.release();
AsyncClusterBinding.this.release();
}
}
}