| /* |
| * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| package org.graalvm.compiler.salver.writer; |
| |
| import java.io.IOException; |
| import java.nio.ByteBuffer; |
| import java.nio.CharBuffer; |
| import java.nio.ReadOnlyBufferException; |
| import java.nio.channels.WritableByteChannel; |
| import java.nio.charset.CharsetEncoder; |
| import java.nio.charset.CoderResult; |
| import java.nio.charset.StandardCharsets; |
| |
| public class ChannelDumpWriter implements DumpWriter { |
| |
| private static final int BUFFER_CAPACITY = 256 * 1024; |
| |
| protected final WritableByteChannel channel; |
| protected final ByteBuffer buffer; |
| |
| public ChannelDumpWriter(WritableByteChannel channel) { |
| this(channel, ByteBuffer.allocateDirect(BUFFER_CAPACITY)); |
| } |
| |
| public ChannelDumpWriter(WritableByteChannel channel, ByteBuffer buffer) { |
| this.channel = channel; |
| this.buffer = buffer; |
| } |
| |
| private void ensureAvailable(int len) throws IOException { |
| if (buffer.isReadOnly()) { |
| throw new ReadOnlyBufferException(); |
| } |
| if (buffer.capacity() < len) { |
| throw new IllegalArgumentException(); |
| } |
| while (buffer.remaining() < len) { |
| flush(); |
| } |
| } |
| |
| @Override |
| public ChannelDumpWriter write(byte b) throws IOException { |
| ensureAvailable(1); |
| buffer.put(b); |
| return this; |
| } |
| |
| @Override |
| public ChannelDumpWriter write(byte[] arr) throws IOException { |
| if (buffer.isReadOnly()) { |
| throw new ReadOnlyBufferException(); |
| } |
| int offset = 0; |
| while (offset < arr.length) { |
| int available = buffer.remaining(); |
| int length = Math.min(available, arr.length - offset); |
| buffer.put(arr, offset, length); |
| if (!buffer.hasRemaining()) { |
| flush(); |
| } |
| offset += length; |
| } |
| return this; |
| } |
| |
| @Override |
| public ChannelDumpWriter write(ByteBuffer buf) throws IOException { |
| if (buf == buffer) { |
| throw new IllegalArgumentException(); |
| } |
| if (buffer.isReadOnly()) { |
| throw new ReadOnlyBufferException(); |
| } |
| while (buf.hasRemaining()) { |
| int available = buffer.remaining(); |
| int remaining = buf.remaining(); |
| for (int i = 0, n = Math.min(available, remaining); i < n; i++) { |
| buffer.put(buf.get()); |
| } |
| if (!buffer.hasRemaining()) { |
| flush(); |
| } |
| } |
| return this; |
| } |
| |
| @Override |
| public ChannelDumpWriter write(CharSequence csq) throws IOException { |
| if (buffer.isReadOnly()) { |
| throw new ReadOnlyBufferException(); |
| } |
| CharsetEncoder encoder = StandardCharsets.UTF_8.newEncoder(); |
| CharBuffer buf = CharBuffer.wrap(csq); |
| while (true) { |
| CoderResult result = encoder.encode(buf, buffer, true); |
| if (result.isError()) { |
| throw new IOException(result.toString()); |
| } |
| if (!buffer.hasRemaining()) { |
| flush(); |
| } |
| if (result.isOverflow()) { |
| continue; |
| } |
| break; |
| } |
| return this; |
| } |
| |
| @Override |
| public ChannelDumpWriter writeChar(char v) throws IOException { |
| ensureAvailable(1 << 1); |
| buffer.putChar(v); |
| return this; |
| } |
| |
| @Override |
| public ChannelDumpWriter writeShort(short v) throws IOException { |
| ensureAvailable(1 << 1); |
| buffer.putShort(v); |
| return this; |
| } |
| |
| @Override |
| public ChannelDumpWriter writeInt(int v) throws IOException { |
| ensureAvailable(1 << 2); |
| buffer.putInt(v); |
| return this; |
| } |
| |
| @Override |
| public ChannelDumpWriter writeLong(long v) throws IOException { |
| ensureAvailable(1 << 3); |
| buffer.putLong(v); |
| return this; |
| } |
| |
| @Override |
| public ChannelDumpWriter writeFloat(float v) throws IOException { |
| ensureAvailable(1 << 2); |
| buffer.putFloat(v); |
| return this; |
| } |
| |
| @Override |
| public ChannelDumpWriter writeDouble(double v) throws IOException { |
| ensureAvailable(1 << 3); |
| buffer.putDouble(v); |
| return this; |
| } |
| |
| @Override |
| public void flush() throws IOException { |
| if (buffer != null && channel != null) { |
| buffer.flip(); |
| channel.write(buffer); |
| buffer.compact(); |
| } |
| } |
| |
| @Override |
| public void close() throws IOException { |
| if (channel != null) { |
| try { |
| flush(); |
| } finally { |
| channel.close(); |
| } |
| } |
| } |
| } |