com.mongodb.binding.AsyncSingleServerBinding Maven / Gradle / Ivy
/*
* 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.ReadPreference;
import com.mongodb.ServerAddress;
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.binding.AbstractReferenceCounted;
import com.mongodb.internal.connection.NoOpSessionContext;
import com.mongodb.selector.ServerAddressSelector;
import com.mongodb.selector.ServerSelector;
import com.mongodb.session.SessionContext;
import static com.mongodb.assertions.Assertions.notNull;
/**
* A simple binding where all connection sources are bound to the server specified in the constructor.
*
* @since 3.11
*/
@Deprecated
public class AsyncSingleServerBinding extends AbstractReferenceCounted implements AsyncReadWriteBinding {
private final Cluster cluster;
private final ServerAddress serverAddress;
private final ReadPreference readPreference;
/**
* Creates an instance, defaulting to {@link com.mongodb.ReadPreference#primary()} for reads.
* @param cluster a non-null Cluster which will be used to select a server to bind to
* @param serverAddress a non-null address of the server to bind to
*/
public AsyncSingleServerBinding(final Cluster cluster, final ServerAddress serverAddress) {
this(cluster, serverAddress, ReadPreference.primary());
}
/**
* Creates an instance.
* @param cluster a non-null Cluster which will be used to select a server to bind to
* @param serverAddress a non-null address of the server to bind to
* @param readPreference a non-null ReadPreference for read operations
*/
public AsyncSingleServerBinding(final Cluster cluster, final ServerAddress serverAddress, final ReadPreference readPreference) {
this.cluster = notNull("cluster", cluster);
this.serverAddress = notNull("serverAddress", serverAddress);
this.readPreference = notNull("readPreference", readPreference);
}
@Override
public ReadPreference getReadPreference() {
return readPreference;
}
@Override
public void getReadConnectionSource(final SingleResultCallback callback) {
getAsyncSingleServerBindingConnectionSource(new ServerAddressSelector(serverAddress), callback);
}
@Override
public void getWriteConnectionSource(final SingleResultCallback callback) {
getAsyncSingleServerBindingConnectionSource(new ServerAddressSelector(serverAddress), callback);
}
private void getAsyncSingleServerBindingConnectionSource(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 AsyncSingleServerBindingConnectionSource(result), null);
}
}
});
}
@Override
public SessionContext getSessionContext() {
return NoOpSessionContext.INSTANCE;
}
@Override
public AsyncSingleServerBinding retain() {
super.retain();
return this;
}
private final class AsyncSingleServerBindingConnectionSource extends AbstractReferenceCounted implements AsyncConnectionSource {
private final Server server;
private AsyncSingleServerBindingConnectionSource(final Server server) {
AsyncSingleServerBinding.this.retain();
this.server = server;
}
@Override
public ServerDescription getServerDescription() {
return server.getDescription();
}
@Override
public SessionContext getSessionContext() {
return NoOpSessionContext.INSTANCE;
}
@Override
public void getConnection(final SingleResultCallback callback) {
server.getConnectionAsync(callback);
}
public AsyncConnectionSource retain() {
super.retain();
return this;
}
@Override
public void release() {
super.release();
if (super.getCount() == 0) {
AsyncSingleServerBinding.this.release();
}
}
}
}