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NativeLongArray.java
107 lines (89 loc) · 3.09 KB
/
NativeLongArray.java
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/*
* Copyright 2016 The Netty Project
*
* The Netty Project 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:
*
* https://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 io.netty.channel.kqueue;
import io.netty.channel.unix.Buffer;
import io.netty.util.internal.PlatformDependent;
import java.nio.ByteBuffer;
import static io.netty.channel.unix.Limits.SIZEOF_JLONG;
import static io.netty.util.internal.ObjectUtil.checkPositive;
final class NativeLongArray {
private ByteBuffer memory;
private long memoryAddress;
private int capacity;
private int size;
NativeLongArray(int capacity) {
this.capacity = checkPositive(capacity, "capacity");
memory = Buffer.allocateDirectWithNativeOrder(calculateBufferCapacity(capacity));
memoryAddress = Buffer.memoryAddress(memory);
}
private static int idx(int index) {
return index * SIZEOF_JLONG;
}
private static int calculateBufferCapacity(int capacity) {
return capacity * SIZEOF_JLONG;
}
void add(long value) {
reallocIfNeeded();
if (PlatformDependent.hasUnsafe()) {
PlatformDependent.putLong(memoryOffset(size), value);
} else {
memory.putLong(idx(size), value);
}
++size;
}
void clear() {
size = 0;
}
boolean isEmpty() {
return size == 0;
}
int size() {
return size;
}
void free() {
Buffer.free(memory);
memoryAddress = 0;
}
long memoryAddress() {
return memoryAddress;
}
long memoryAddressEnd() {
return memoryOffset(size);
}
private long memoryOffset(int index) {
return memoryAddress + idx(index);
}
private void reallocIfNeeded() {
if (size == capacity) {
// Double the capacity while it is "sufficiently small", and otherwise increase by 50%.
int newLength = capacity <= 65536 ? capacity << 1 : capacity + capacity >> 1;
ByteBuffer buffer = Buffer.allocateDirectWithNativeOrder(calculateBufferCapacity(newLength));
// Copy over the old content of the memory and reset the position as we always act on the buffer as if
// the position was never increased.
memory.position(0).limit(size);
buffer.put(memory);
buffer.position(0);
Buffer.free(memory);
memory = buffer;
memoryAddress = Buffer.memoryAddress(buffer);
capacity = newLength;
}
}
@Override
public String toString() {
return "memoryAddress: " + memoryAddress + " capacity: " + capacity + " size: " + size;
}
}