| /* |
| * 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.ignite.internal.processors.cache.persistence.file; |
| |
| import java.io.IOException; |
| import java.nio.ByteBuffer; |
| import org.apache.ignite.internal.util.typedef.internal.U; |
| |
| /** |
| * |
| */ |
| public abstract class AbstractFileIO implements FileIO { |
| /** Max io timeout milliseconds. */ |
| private static final int MAX_IO_TIMEOUT_MS = 2000; |
| |
| /** |
| * |
| */ |
| private interface IOOperation { |
| /** |
| * @param offs Offset. |
| * |
| * @return Number of bytes operated. |
| */ |
| public int run(int offs) throws IOException; |
| } |
| |
| /** |
| * @param operation IO operation. |
| * |
| * @param num Number of bytes to operate. |
| */ |
| private int fully(IOOperation operation, long position, int num, boolean write) throws IOException { |
| if (num > 0) { |
| long time = 0; |
| |
| for (int i = 0; i < num; ) { |
| int n = operation.run(i); |
| |
| if (n > 0) { |
| i += n; |
| time = 0; |
| } |
| else if (n == 0 || i > 0) { |
| if (!write && available(num - i, position + i) == 0) |
| return i; |
| |
| if (time == 0) |
| time = System.nanoTime(); |
| else if ((System.nanoTime() - time) >= U.millisToNanos(MAX_IO_TIMEOUT_MS)) |
| throw new IOException(write && (position + i) == size() ? "Failed to extend file." : |
| "Probably disk is too busy, please check your device."); |
| } |
| else |
| return -1; |
| } |
| } |
| |
| return num; |
| } |
| |
| /** {@inheritDoc} */ |
| @Override public int readFully(final ByteBuffer destBuf) throws IOException { |
| return fully(new IOOperation() { |
| @Override public int run(int offs) throws IOException { |
| return read(destBuf); |
| } |
| }, position(), destBuf.remaining(), false); |
| } |
| |
| /** {@inheritDoc} */ |
| @Override public int readFully(final ByteBuffer destBuf, final long position) throws IOException { |
| return fully(new IOOperation() { |
| @Override public int run(int offs) throws IOException { |
| return read(destBuf, position + offs); |
| } |
| }, position, destBuf.remaining(), false); |
| } |
| |
| /** {@inheritDoc} */ |
| @Override public int readFully(final byte[] buf, final int off, final int len) throws IOException { |
| return fully(new IOOperation() { |
| @Override public int run(int offs) throws IOException { |
| return read(buf, off + offs, len - offs); |
| } |
| }, position(), len, false); |
| } |
| |
| /** {@inheritDoc} */ |
| @Override public int writeFully(final ByteBuffer srcBuf) throws IOException { |
| return fully(new IOOperation() { |
| @Override public int run(int offs) throws IOException { |
| return write(srcBuf); |
| } |
| }, position(), srcBuf.remaining(), true); |
| } |
| |
| /** {@inheritDoc} */ |
| @Override public int writeFully(final ByteBuffer srcBuf, final long position) throws IOException { |
| return fully(new IOOperation() { |
| @Override public int run(int offs) throws IOException { |
| return write(srcBuf, position + offs); |
| } |
| }, position, srcBuf.remaining(), true); |
| } |
| |
| /** {@inheritDoc} */ |
| @Override public int writeFully(final byte[] buf, final int off, final int len) throws IOException { |
| return fully(new IOOperation() { |
| @Override public int run(int offs) throws IOException { |
| return write(buf, off + offs, len - offs); |
| } |
| }, position(), len, true); |
| } |
| |
| /** |
| * @param requested Requested. |
| * @param position Position. |
| * |
| * @return Bytes available. |
| */ |
| private int available(int requested, long position) throws IOException { |
| long avail = size() - position; |
| |
| return requested > avail ? (int)avail : requested; |
| } |
| |
| } |