net.sandius.rembulan.env.SystemRuntimeEnvironment Maven / Gradle / Ivy
/*
* Copyright 2016 Miroslav Janíček
*
* Licensed 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 net.sandius.rembulan.env;
import java.io.InputStream;
import java.io.OutputStream;
import java.lang.management.ManagementFactory;
import java.nio.file.FileSystem;
import java.nio.file.FileSystems;
class SystemRuntimeEnvironment implements RuntimeEnvironment {
private final InputStream in;
private final OutputStream out;
private final OutputStream err;
private static final SystemRuntimeEnvironment INSTANCE = new SystemRuntimeEnvironment(
System.in, System.out, System.err);
SystemRuntimeEnvironment(InputStream in, OutputStream out, OutputStream err) {
this.in = in;
this.out = out;
this.err = err;
}
public static SystemRuntimeEnvironment getInstance() {
return INSTANCE;
}
@Override
public InputStream standardInput() {
return in;
}
@Override
public OutputStream standardOutput() {
return out;
}
@Override
public OutputStream standardError() {
return err;
}
@Override
public FileSystem fileSystem() {
return FileSystems.getDefault();
}
@Override
public String getEnv(String name) {
return System.getenv(name);
}
@Override
public double getCpuTime() {
// FIXME: this really isn't a good idea...
long nanos = ManagementFactory.getThreadMXBean().getCurrentThreadCpuTime();
return nanos / 1000000000.0;
}
}