com.mongodb.binding.AsyncSingleConnectionReadBinding 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.async.SingleResultCallback;
import com.mongodb.connection.AsyncConnection;
import com.mongodb.connection.ServerDescription;
import com.mongodb.internal.binding.AbstractReferenceCounted;
import com.mongodb.internal.connection.NoOpSessionContext;
import com.mongodb.session.SessionContext;
import static com.mongodb.assertions.Assertions.notNull;
/**
* An asynchronous read binding that is bound to a single connection.
*
* @since 3.2
*/
@Deprecated
public class AsyncSingleConnectionReadBinding extends AbstractReferenceCounted implements AsyncReadBinding {
private final ReadPreference readPreference;
private final ServerDescription serverDescription;
private final AsyncConnection connection;
/**
* Construct an instance.
*
* @param readPreference the read preferenced of this binding
* @param serverDescription the description of the server
* @param connection the connection to bind to.
*/
public AsyncSingleConnectionReadBinding(final ReadPreference readPreference, final ServerDescription serverDescription,
final AsyncConnection connection) {
this.readPreference = notNull("readPreference", readPreference);
this.serverDescription = notNull("serverDescription", serverDescription);
this.connection = notNull("connection", connection).retain();
}
@Override
public ReadPreference getReadPreference() {
return readPreference;
}
@Override
public SessionContext getSessionContext() {
return NoOpSessionContext.INSTANCE;
}
@Override
public void getReadConnectionSource(final SingleResultCallback callback) {
callback.onResult(new AsyncSingleConnectionSource(), null);
}
@Override
public AsyncReadBinding retain() {
super.retain();
return this;
}
@Override
public void release() {
super.release();
if (getCount() == 0) {
connection.release();
}
}
private class AsyncSingleConnectionSource extends AbstractReferenceCounted implements AsyncConnectionSource {
AsyncSingleConnectionSource() {
AsyncSingleConnectionReadBinding.this.retain();
}
@Override
public ServerDescription getServerDescription() {
return serverDescription;
}
@Override
public SessionContext getSessionContext() {
return NoOpSessionContext.INSTANCE;
}
@Override
public void getConnection(final SingleResultCallback callback) {
callback.onResult(connection.retain(), null);
}
@Override
public AsyncConnectionSource retain() {
super.retain();
return this;
}
@Override
public void release() {
super.release();
if (super.getCount() == 0) {
AsyncSingleConnectionReadBinding.this.release();
}
}
}
}