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/***** BEGIN LICENSE BLOCK *****
* Version: EPL 2.0/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Eclipse Public
* 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.eclipse.org/legal/epl-v20.html
*
* Software distributed under the License is distributed on an "AS
* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
* implied. See the License for the specific language governing
* rights and limitations under the License.
*
* Copyright (C) 2009 Sun Microsystems, Inc
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the EPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the EPL, the GPL or the LGPL.
***** END LICENSE BLOCK *****/
package org.jruby.util;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.channels.Channel;
import java.nio.channels.ReadableByteChannel;
import java.nio.channels.WritableByteChannel;
import org.jruby.Ruby;
import org.jruby.RubyFixnum;
import org.jruby.RubyString;
import org.jruby.exceptions.ReadPartialBufferOverflowException;
import org.jruby.runtime.CallSite;
import org.jruby.runtime.ThreadContext;
import org.jruby.runtime.builtin.IRubyObject;
import org.jruby.runtime.MethodIndex;
import org.jruby.runtime.callsite.CacheEntry;
import org.jruby.runtime.callsite.FunctionalCachingCallSite;
import org.jruby.runtime.callsite.RespondToCallSite;
import static org.jruby.api.Convert.asFixnum;
import static org.jruby.api.Convert.toInt;
/**
* Wrap an IO object in a Channel.
*
* @see IOReadableByteChannel
* @see IOWritableByteChannel
* @see IOReadableWritableByteChannel
*/
public abstract class IOChannel implements Channel {
protected final IRubyObject io;
private final CallSite closeAdapter = MethodIndex.getFunctionalCallSite("close");
private final RespondToCallSite respondToClosed = new RespondToCallSite("closed?");
private final CallSite isClosedAdapter = MethodIndex.getFunctionalCallSite("closed?");
protected final Ruby runtime;
protected IOChannel(final IRubyObject io) {
this.io = io;
this.runtime = io.getRuntime();
}
public void close() throws IOException {
ThreadContext context = runtime.getCurrentContext();
// no call site use here since this will likely only be called once
if (io.respondsTo("close")) {
closeAdapter.call(context, io, io);
}
// can't close, assume it doesn't need to be
}
public boolean isOpen() {
ThreadContext context = runtime.getCurrentContext();
if (respondToClosed.respondsTo(context, io, io)) {
return !isClosedAdapter.call(context, io, io).isTrue();
}
// can't determine, assume it's open
return true;
}
protected static int read(Ruby runtime, IRubyObject io, FunctionalCachingCallSite read, ByteBuffer dst) throws IOException {
ThreadContext context = runtime.getCurrentContext();
int remaining = dst.remaining();
CacheEntry readMethodEntry = read.retrieveCache(io);
RubyFixnum remainingFixnum = asFixnum(context, remaining);
IRubyObject readValue, retValue;
if (readMethodEntry.method.getSignature().isTwoArguments()) {
if (dst.hasArray()) {
readValue = RubyString.newStringNoCopy(runtime, dst.array(), dst.position(), remaining);
} else {
readValue = RubyString.newStringLight(runtime, remaining);
}
retValue = read.call(context, io, io, remainingFixnum, readValue);
} else {
retValue = readValue = read.call(context, io, io, remainingFixnum);
}
int returnValue = -1;
RubyString readString;
if (!retValue.isNil()
&& (readString = readValue.convertToString()).size() > 0) {
ByteList str = readString.getByteList();
int realSize = str.getRealSize();
if (realSize > remaining) {
throw new ReadPartialBufferOverflowException(
"error calling " + io.getType() + "#readpartial: requested " + remaining + " bytes but received " + realSize);
}
dst.put(str.getUnsafeBytes(), str.getBegin(), realSize);
returnValue = realSize;
}
return returnValue;
}
/**
* Perform a write to the given IO-like object, using the given call site, and passing the contents of the given
* buffer.
*
* The buffer and its contents should not be referenced beyond the method's return.
*
* @param runtime the current runtime
* @param io the target IO-like object
* @param write the call site for making dynamic `write` calls
* @param src the data to write
* @return the amount of data reported written by the dynamic `write` call
*/
protected static int write(Ruby runtime, IRubyObject io, FunctionalCachingCallSite write, ByteBuffer src) {
ByteList buffer;
int position = src.position();
int remaining = src.remaining();
// copy buffer contents to a ByteList
if (src.hasArray()) {
buffer = new ByteList(src.array(), src.position(), remaining, true);
} else {
buffer = new ByteList(remaining);
buffer.append(src, remaining);
}
var context = runtime.getCurrentContext();
// call write with new String based on this ByteList
IRubyObject written = write.call(context, io, io, RubyString.newStringLight(runtime, buffer));
int wrote = toInt(context, written);
// set source position to match bytes written
if (wrote > 0) src.position(position + wrote);
return wrote;
}
protected FunctionalCachingCallSite initReadSite(String readMethod) {
// no call site use here since this will only be called once
if(io.respondsTo(readMethod)) {
return new FunctionalCachingCallSite(readMethod);
} else {
throw new IllegalArgumentException(io.getMetaClass() + "not coercible to " + getClass().getSimpleName() + ": no '" + readMethod + "' method");
}
}
protected FunctionalCachingCallSite initWriteSite() {
// no call site use here since this will only be called once
if(io.respondsTo("write")) {
return new FunctionalCachingCallSite("write");
} else if (io.respondsTo("<<")) {
return new FunctionalCachingCallSite("<<");
} else {
throw new IllegalArgumentException(io.getMetaClass() + "not coercible to " + getClass().getSimpleName() + ": no 'write' method");
}
}
/**
* A {@link ReadableByteChannel} wrapper around an IO-like Ruby object.
*/
public static class IOReadableByteChannel extends IOChannel implements ReadableByteChannel {
private final FunctionalCachingCallSite read;
public IOReadableByteChannel(final IRubyObject io) {
this(io, "read");
}
public IOReadableByteChannel(final IRubyObject io, final String readMethod) {
super(io);
read = initReadSite(readMethod);
}
public int read(ByteBuffer dst) throws IOException {
return read(runtime, io, read, dst);
}
}
/**
* A {@link WritableByteChannel} wrapper around an IO-like Ruby object.
*/
public static class IOWritableByteChannel extends IOChannel implements WritableByteChannel {
private final FunctionalCachingCallSite write;
public IOWritableByteChannel(final IRubyObject io) {
super(io);
write = initWriteSite();
}
public int write(ByteBuffer src) throws IOException {
return write(runtime, io, write, src);
}
}
/**
* A {@link ReadableByteChannel} and {@link WritableByteChannel} wrapper around an IO-like Ruby object.
*/
public static class IOReadableWritableByteChannel extends IOChannel implements ReadableByteChannel, WritableByteChannel {
private final FunctionalCachingCallSite write;
private final FunctionalCachingCallSite read;
public IOReadableWritableByteChannel(final IRubyObject io) {
super(io);
read = initReadSite("read");
write = initWriteSite();
}
public int read(ByteBuffer dst) throws IOException {
return read(runtime, io, read, dst);
}
public int write(ByteBuffer src) throws IOException {
return write(runtime, io, write, src);
}
}
}