com.netflix.servo.monitor.MonitorWrapper Maven / Gradle / Ivy

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/**
 * Copyright 2013 Netflix, Inc.
 *
 * 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 com.netflix.servo.monitor;

import com.netflix.servo.tag.TagList;

/**
 * Wraps another monitor object providing an alternative configuration.
 */
class MonitorWrapper extends AbstractMonitor {
    private final Monitor monitor;

    /** Creates a new instance of the wrapper. */
    public MonitorWrapper(TagList tags, Monitor monitor) {
        super(monitor.getConfig().withAdditionalTags(tags));
        this.monitor = monitor;
    }

    /** {@inheritDoc} */
    @Override
    public T getValue(int pollerIdx) {
        return monitor.getValue();
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public boolean equals(Object obj) {
        if (obj == null || !(obj instanceof MonitorWrapper)) {
            return false;
        }
        MonitorWrapper m = (MonitorWrapper) obj;
        return config.equals(m.getConfig()) && monitor.equals(m.monitor);
    }

    /** {@inheritDoc} */
    @Override
    public int hashCode() {
        int result = getConfig().hashCode();
        result = 31 * result + monitor.hashCode();
        return result;
    }

    /** {@inheritDoc} */
    @Override
    public String toString() {
        return "MonitorWrapper{config=" + config + ", monitor=" + monitor + '}';
    }
}