/*
* Licensed to Crate under one or more contributor license agreements.
* See the NOTICE file distributed with this work for additional
* information regarding copyright ownership. Crate 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.
*
* However, if you have executed another commercial license agreement
* with Crate these terms will supersede the license and you may use the
* software solely pursuant to the terms of the relevant commercial
* agreement.
*/
package io.crate.operation.reference.sys.node.local;
import io.crate.metadata.ReferenceImplementation;
import io.crate.monitor.ExtendedOsStats;
import io.crate.operation.reference.NestedObjectExpression;
public class NodeLoadExpression extends NestedObjectExpression {
private static final String ONE = "1";
private static final String FIVE = "5";
private static final String FIFTEEN = "15";
private static final String PROBE_TIMESTAMP = "probe_timestamp";
public NodeLoadExpression(final ExtendedOsStats os) {
childImplementations.put(ONE, new LoadExpression(os, 0));
childImplementations.put(FIVE, new LoadExpression(os, 1));
childImplementations.put(FIFTEEN, new LoadExpression(os, 2));
childImplementations.put(PROBE_TIMESTAMP, os::timestamp);
}
private static class LoadExpression implements ReferenceImplementation<Double> {
private final int idx;
private final ExtendedOsStats stats;
LoadExpression(ExtendedOsStats stats, int idx) {
this.idx = idx;
this.stats = stats;
}
@Override
public Double value() {
try {
return stats.loadAverage()[idx];
} catch (IndexOutOfBoundsException e) {
return -1d;
}
}
}
}