package org.apache.maven.plugin.surefire.booterclient.lazytestprovider;
/*
* 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.
*/
import org.apache.maven.surefire.booter.Command;
import org.apache.maven.surefire.booter.MasterProcessCommand;
import java.io.IOException;
/**
* Reader stream sends commands to forked jvm std-{@link java.io.InputStream input-stream}.
*
* @author <a href="mailto:tibordigana@apache.org">Tibor Digana (tibor17)</a>
* @since 2.19
* @see org.apache.maven.surefire.booter.Command
*/
public abstract class AbstractCommandStream
extends AbstractForkInputStream
{
private byte[] currentBuffer;
private int currentPos;
private volatile MasterProcessCommand lastCommand;
protected abstract boolean isClosed();
/**
* Opposite to {@link #isClosed()}.
* @return {@code true} if not closed
*/
protected boolean canContinue()
{
return !isClosed();
}
/**
* Possibly waiting for next command (see {@link #nextCommand()}) unless the stream is atomically
* closed (see {@link #isClosed()} returns {@code true}) before this method has returned.
*
* @throws IOException stream error while waiting for notification regarding next test required by forked jvm
*/
protected void beforeNextCommand()
throws IOException
{
}
protected abstract Command nextCommand();
/**
* Returns quietly and immediately.
*/
protected final void invalidateInternalBuffer()
{
currentBuffer = null;
currentPos = 0;
}
@Deprecated
protected final MasterProcessCommand getLastCommand()
{
return lastCommand;
}
/**
* Used by single thread in StreamFeeder class.
*
* @return {@inheritDoc}
* @throws IOException {@inheritDoc}
*/
@SuppressWarnings( "checkstyle:magicnumber" )
@Override
public int read()
throws IOException
{
if ( isClosed() )
{
return -1;
}
byte[] buffer = currentBuffer;
if ( buffer == null )
{
tryFlush();
if ( !canContinue() )
{
close();
return -1;
}
beforeNextCommand();
if ( isClosed() )
{
return -1;
}
Command cmd = nextCommand();
lastCommand = cmd.getCommandType();
buffer = lastCommand.hasDataType() ? lastCommand.encode( cmd.getData() ) : lastCommand.encode();
}
int b = buffer[currentPos++] & 0xff;
if ( currentPos == buffer.length )
{
buffer = null;
currentPos = 0;
}
currentBuffer = buffer;
return b;
}
}