54 lines
1.9 KiB
Java
54 lines
1.9 KiB
Java
/*
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* Copyright 2021 The Netty Project
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*
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* The Netty Project licenses this file to you under the Apache License,
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* version 2.0 (the "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at:
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*
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* https://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*/
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package io.netty.buffer.api.internal;
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import io.netty.buffer.api.MemoryManagers;
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import io.netty.buffer.api.bytebuffer.ByteBufferMemoryManagers;
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import java.util.Collections;
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import java.util.IdentityHashMap;
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import java.util.Map;
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import java.util.concurrent.atomic.AtomicInteger;
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import java.util.function.Supplier;
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public final class MemoryManagersOverride {
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private static final MemoryManagers DEFAULT = new ByteBufferMemoryManagers();
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private static final AtomicInteger OVERRIDES_AVAILABLE = new AtomicInteger();
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private static final Map<Thread, MemoryManagers> OVERRIDES = Collections.synchronizedMap(new IdentityHashMap<>());
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private MemoryManagersOverride() {
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}
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public static MemoryManagers getManagers() {
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if (OVERRIDES_AVAILABLE.get() > 0) {
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return OVERRIDES.getOrDefault(Thread.currentThread(), DEFAULT);
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}
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return DEFAULT;
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}
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public static <T> T using(MemoryManagers managers, Supplier<T> supplier) {
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Thread thread = Thread.currentThread();
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OVERRIDES.put(thread, managers);
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OVERRIDES_AVAILABLE.incrementAndGet();
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try {
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return supplier.get();
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} finally {
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OVERRIDES_AVAILABLE.decrementAndGet();
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OVERRIDES.remove(thread);
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}
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}
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}
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