/*
* 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.util.ipc.shmem;
import java.io.IOException;
import java.io.InputStream;
import org.apache.ignite.IgniteCheckedException;
import org.apache.ignite.internal.util.typedef.internal.S;
/**
*
*/
public class IpcSharedMemoryInputStream extends InputStream {
/** */
private final IpcSharedMemorySpace in;
/** Stream instance is not thread-safe so we can cache buffer. */
private byte[] buf = new byte[1];
/**
* @param in Space.
*/
public IpcSharedMemoryInputStream(IpcSharedMemorySpace in) {
assert in != null;
this.in = in;
}
/** {@inheritDoc} */
@Override public int read() throws IOException {
try {
int read = in.read(buf, 0, 1, 0);
if (read < 0)
return read;
return buf[0] & 0xFF;
}
catch (IgniteCheckedException e) {
throw new IOException(e);
}
}
/** {@inheritDoc} */
@Override public int read(byte[] b, int off, int len) throws IOException {
try {
return in.read(b, off, len, 0);
}
catch (IgniteCheckedException e) {
throw new IOException(e);
}
}
/** {@inheritDoc} */
@Override public int available() throws IOException {
try {
return in.unreadCount();
}
catch (IgniteCheckedException e) {
throw new IOException(e);
}
}
/** {@inheritDoc} */
@Override public void close() throws IOException {
in.close();
}
/**
* Forcibly closes spaces and frees all system resources.
* <p>
* This method should be called with caution as it may result to the other-party
* process crash. It is intended to call when there was an IO error during handshake
* and other party has not yet attached to the space.
*/
public void forceClose() {
in.forceClose();
}
/** {@inheritDoc} */
@Override public String toString() {
return S.toString(IpcSharedMemoryInputStream.class, this);
}
}