com.datastax.driver.core.policies.NoSpeculativeExecutionPolicy Maven / Gradle / Ivy
/*
* Copyright 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.Statement;
/** A {@link SpeculativeExecutionPolicy} that never schedules speculative executions. */
public class NoSpeculativeExecutionPolicy implements SpeculativeExecutionPolicy {
/** The single instance (this class is stateless). */
public static final NoSpeculativeExecutionPolicy INSTANCE = new NoSpeculativeExecutionPolicy();
private static final SpeculativeExecutionPlan PLAN =
new SpeculativeExecutionPlan() {
@Override
public long nextExecution(Host lastQueried) {
return -1;
}
};
@Override
public SpeculativeExecutionPlan newPlan(String loggedKeyspace, Statement statement) {
return PLAN;
}
private NoSpeculativeExecutionPolicy() {
// do nothing
}
@Override
public void init(Cluster cluster) {
// do nothing
}
@Override
public void close() {
// do nothing
}
}