commit-table/src/main/java/org/apache/omid/committable/NullCommitTable.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.omid.committable;

import com.google.common.base.Optional;
import com.google.common.util.concurrent.ListenableFuture;
import com.google.common.util.concurrent.SettableFuture;

import java.io.IOException;

public class NullCommitTable implements CommitTable {
    @Override
    public CommitTable.Writer getWriter() {
        return new Writer();
    }

    @Override
    public CommitTable.Client getClient() {
        return new Client();
    }

    public static class Writer implements CommitTable.Writer {
        @Override
        public void addCommittedTransaction(long startTimestamp, long commitTimestamp) {
            // noop
        }

        @Override
        public void updateLowWatermark(long lowWatermark) throws IOException {
            // noop
        }

        @Override
        public void clearWriteBuffer() {
            // noop
        }

        @Override
        public boolean atomicAddCommittedTransaction(long startTimestamp, long commitTimestamp) throws IOException {
            return true;
        }

        @Override
        public void flush() throws IOException {
            // noop
        }

        @Override
        public void close() {
        }

    }

    public static class Client implements CommitTable.Client {
        @Override
        public ListenableFuture<Optional<CommitTimestamp>> getCommitTimestamp(long startTimestamp) {
            throw new UnsupportedOperationException();
        }

        @Override
        public ListenableFuture<Long> readLowWatermark() {
            throw new UnsupportedOperationException();
        }

        @Override
        public ListenableFuture<Void> completeTransaction(long startTimestamp) {
            SettableFuture<Void> f = SettableFuture.create();
            f.set(null);
            return f;
        }

        @Override
        public ListenableFuture<Boolean> tryInvalidateTransaction(long startTimestamp) {
            throw new UnsupportedOperationException();
        }

        @Override
        public void close() {
        }
    }
}