| /* |
| * 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.iotdb.rpc; |
| |
| import org.apache.thrift.TConfiguration; |
| import org.apache.thrift.transport.TTransport; |
| import org.apache.thrift.transport.TTransportException; |
| |
| public class AutoScalingBufferReadTransport extends NonOpenTransport { |
| |
| private final AutoResizingBuffer buf; |
| private int pos = 0; |
| private int limit = 0; |
| |
| public AutoScalingBufferReadTransport(int initialCapacity) { |
| this.buf = new AutoResizingBuffer(initialCapacity); |
| } |
| |
| public void fill(TTransport inTrans, int length) throws TTransportException { |
| buf.resizeIfNecessary(length); |
| inTrans.readAll(buf.array(), 0, length); |
| pos = 0; |
| limit = length; |
| } |
| |
| @Override |
| public final int read(byte[] target, int off, int len) { |
| int amtToRead = Math.min(len, getBytesRemainingInBuffer()); |
| System.arraycopy(buf.array(), pos, target, off, amtToRead); |
| consumeBuffer(amtToRead); |
| return amtToRead; |
| } |
| |
| @Override |
| public void write(byte[] buf, int off, int len) { |
| throw new UnsupportedOperationException(); |
| } |
| |
| @Override |
| public final void consumeBuffer(int len) { |
| pos += len; |
| } |
| |
| @Override |
| public TConfiguration getConfiguration() { |
| // should never call this method. |
| return null; |
| } |
| |
| @Override |
| public void updateKnownMessageSize(long size) throws TTransportException {} |
| |
| @Override |
| public void checkReadBytesAvailable(long numBytes) throws TTransportException {} |
| |
| @Override |
| public final byte[] getBuffer() { |
| return buf.array(); |
| } |
| |
| @Override |
| public final int getBufferPosition() { |
| return pos; |
| } |
| |
| @Override |
| public final int getBytesRemainingInBuffer() { |
| return limit - pos; |
| } |
| |
| public void resizeIfNecessary(int size) { |
| buf.resizeIfNecessary(size); |
| } |
| |
| public void limit(int newLimit) { |
| this.limit = newLimit; |
| } |
| |
| public void position(int newPosition) { |
| this.pos = newPosition; |
| } |
| } |