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Key.java
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61 lines (53 loc) · 1.62 KB
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/*
* Copyright © 2016-2025 The LmdbJava Open Source Project
*
* Licensed 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.lmdbjava;
import static java.util.Objects.requireNonNull;
import static org.lmdbjava.BufferProxy.MDB_VAL_STRUCT_SIZE;
import static org.lmdbjava.Library.RUNTIME;
import jnr.ffi.Pointer;
import jnr.ffi.provider.MemoryManager;
/**
* Represents off-heap memory holding a key only. Equivalent to {@link KeyVal} without the val part.
*
* @param <T> buffer type
*/
final class Key<T> implements AutoCloseable {
private static final MemoryManager MEM_MGR = RUNTIME.getMemoryManager();
private boolean closed;
private final T k;
private final BufferProxy<T> proxy;
private final Pointer ptrKey;
Key(final BufferProxy<T> proxy) {
requireNonNull(proxy);
this.proxy = proxy;
this.k = proxy.allocate();
ptrKey = MEM_MGR.allocateTemporary(MDB_VAL_STRUCT_SIZE, false);
}
@Override
public void close() {
if (closed) {
return;
}
closed = true;
proxy.deallocate(k);
}
void keyIn(final T key) {
proxy.in(key, ptrKey);
}
Pointer pointer() {
return ptrKey;
}
}