modules/core/src/main/java/org/apache/ignite/internal/binary/BinaryContextHolder.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.ignite.internal.binary;

import org.jetbrains.annotations.Nullable;

/**
 * Binary context holder. We use to avoid {@code ThreadLocal.clear()} and/or {{}}ThreadLocal.set()}} operations on
 * every serialization/deserialization, as they may take considerable amount of CPU time (confirmed by benchmarks).
 */
public class BinaryContextHolder {
    /** Context. */
    private BinaryContext ctx;

    /**
     * @return Context.
     */
    @Nullable public BinaryContext get() {
        return ctx;
    }

    /**
     * @param newCtx New context.
     * @return Previous context.
     */
    @Nullable public BinaryContext set(@Nullable BinaryContext newCtx) {
        BinaryContext oldCtx = ctx;

        ctx = newCtx;

        return oldCtx;
    }
}