/*
* Copyright (C) 2012-2015 DataStax 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.datastax.driver.core.policies;
import com.datastax.driver.core.Cluster;
import com.datastax.driver.core.Host;
import com.datastax.driver.core.HostDistance;
import com.datastax.driver.core.Statement;
import java.util.Collection;
import java.util.Iterator;
/**
* Base class for tests that want to wrap a policy to add some instrumentation.
* <p/>
* NB: this is currently only used in tests, but could be provided as a convenience in the production code.
*/
public abstract class DelegatingLoadBalancingPolicy implements ChainableLoadBalancingPolicy {
protected final LoadBalancingPolicy delegate;
public DelegatingLoadBalancingPolicy(LoadBalancingPolicy delegate) {
this.delegate = delegate;
}
public void init(Cluster cluster, Collection<Host> hosts) {
delegate.init(cluster, hosts);
}
public HostDistance distance(Host host) {
return delegate.distance(host);
}
public Iterator<Host> newQueryPlan(String loggedKeyspace, Statement statement) {
return delegate.newQueryPlan(loggedKeyspace, statement);
}
public void onAdd(Host host) {
delegate.onAdd(host);
}
public void onUp(Host host) {
delegate.onUp(host);
}
public void onDown(Host host) {
delegate.onDown(host);
}
public void onRemove(Host host) {
delegate.onRemove(host);
}
@Override
public LoadBalancingPolicy getChildPolicy() {
return delegate;
}
@Override
public void close() {
delegate.close();
}
}