org.apache.thrift.transport.AutoExpandingBuffer Maven / Gradle / Ivy
The newest version!
/*
* 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.thrift.transport;
import java.util.Arrays;
/**
* Helper class that wraps a byte[] so that it can expand and be reused. Users should call
* resizeIfNecessary to make sure the buffer has suitable capacity, and then use the array as
* needed. Note that the internal array will grow at a rate slightly faster than the requested
* capacity with the (untested) objective of avoiding expensive buffer allocations and copies.
*/
public class AutoExpandingBuffer {
private byte[] array;
public AutoExpandingBuffer(int initialCapacity) {
this.array = new byte[initialCapacity];
}
public void resizeIfNecessary(int size) {
final int currentCapacity = this.array.length;
if (currentCapacity < size) {
// Increase by a factor of 1.5x
int growCapacity = currentCapacity + (currentCapacity >> 1);
int newCapacity = Math.max(growCapacity, size);
this.array = Arrays.copyOf(array, newCapacity);
}
}
public byte[] array() {
return this.array;
}
}