external/storm-cassandra/src/main/java/org/apache/storm/cassandra/executor/ExecutionResultCollector.java

/**
 * Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.  The ASF licenses this file to you 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 org.apache.storm.cassandra.executor;

import com.google.common.collect.Lists;
import java.util.List;
import org.apache.storm.cassandra.ExecutionResultHandler;
import org.apache.storm.task.OutputCollector;
import org.apache.storm.tuple.Tuple;

/**
 * This class is responsible to collect input tuples proceed.
 */
public interface ExecutionResultCollector {

    void handle(OutputCollector collector, ExecutionResultHandler handler);

    final class SucceedCollector implements ExecutionResultCollector {

        private final List<Tuple> inputs;

        /**
         * Creates a new {@link ExecutionResultCollector} instance.
         * @param input the input tuple.
         */
        public SucceedCollector(Tuple input) {
            this(Lists.newArrayList(input));
        }

        /**
         * Creates a new {@link ExecutionResultCollector} instance.
         * @param inputs the input tuple.
         */
        public SucceedCollector(List<Tuple> inputs) {
            this.inputs = inputs;
        }

        /**
         * Calls {@link ExecutionResultHandler#onQuerySuccess(org.apache.storm.task.OutputCollector, org.apache.storm.tuple.Tuple)} before
         * acknowledging an single input tuple.
         */
        @Override
        public void handle(OutputCollector collector, ExecutionResultHandler handler) {
            for (Tuple t : inputs) {
                handler.onQuerySuccess(collector, t);
            }
            for (Tuple t : inputs) {
                collector.ack(t);
            }
        }
    }

    final class FailedCollector implements ExecutionResultCollector {

        private final Throwable cause;
        private final List<Tuple> inputs;

        /**
         * Creates a new {@link FailedCollector} instance.
         * @param input the input tuple.
         * @param cause the cause of the error.
         */
        public FailedCollector(Tuple input, Throwable cause) {
            this(Lists.newArrayList(input), cause);
        }

        /**
         * Creates a new {@link FailedCollector} instance.
         * @param inputs the input tuple.
         * @param cause the cause of the error.
         */
        public FailedCollector(List<Tuple> inputs, Throwable cause) {
            this.inputs = inputs;
            this.cause = cause;
        }

        /**
         * Calls
         * {@link ExecutionResultHandler#onThrowable(Throwable, org.apache.storm.task.OutputCollector, org.apache.storm.tuple.Tuple)} .
         */
        @Override
        public void handle(OutputCollector collector, ExecutionResultHandler handler) {
            handler.onThrowable(cause, collector, inputs);
        }
    }

}