95709828bf
Motivation: We need a new implementation of our new API that supports Java 11, since that is what Netty 5 will most likely baseline on. We also need an implementation that does not rely on Unsafe. This leaves us with ByteBuffer as the underlying currency of memory. Modification: - Add a NioBuffer implementation and associated supporting classes. - The entry-point for this is a new MemoryManagers API, which is used to pick the implementation and provide the on-/off-heap MemoryManager implementations. - Add a mechanism to configure/override which MemoryManagers implementation to use. - The MemoryManagers implementations are service-loadable, so new ones can be discovered at runtime. - The existing MemorySegment based implementation also get a MemoryManagers implementation. - Expand the BufferTest to include all combinations of all implementations. We now run 360.000 tests in BufferTest. - Some common infrastructure, like ArcDrop, is moved to its own package. - Add a module-info.java to control the service loading, and the visibility in the various packages. - Some pom.xml file updates to support our now module based project. Result: We have an implementation that should work on Java 11, but we currently don't build or test on 11. More work needs to happen before that is a reality.
53 lines
1.8 KiB
Java
53 lines
1.8 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;
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import io.netty.buffer.api.memseg.SegmentMemoryManagers;
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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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final class MemoryManagersOverride {
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private static final MemoryManagers DEFAULT = new SegmentMemoryManagers();
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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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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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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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