com.hazelcast.internal.metrics.renderers.HumanFriendlyProbeRenderer Maven / Gradle / Ivy

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/*
 * Copyright (c) 2008-2016, Hazelcast, Inc. All Rights Reserved.
 *
 * 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.hazelcast.internal.metrics.renderers;

/**
 * A human friendly {@link ProbeRenderer} implementation.
 *
 * The output will be something like:
 * 
 *     longVal = 9,980,213
 *     doubleVal = 9.9802e+06
 * 
 */
public class HumanFriendlyProbeRenderer implements ProbeRenderer {

    private final StringBuilder sb = new StringBuilder();

    @Override
    public void start() {
        sb.setLength(0);
    }

    @Override
    public void renderLong(String name, long value) {
        sb.append(String.format("%s = %,d%n", name, value));
    }

    @Override
    public void renderDouble(String name, double value) {
        sb.append(String.format("%s = %.4e%n", name, value));
    }

    @Override
    public void renderException(String name, Exception e) {
        sb.append(name).append(" = ").append(e.getMessage()).append('\n');
    }

    @Override
    public void renderNoValue(String name) {
        sb.append(name).append(" = NA\n");
    }

    @Override
    public void finish() {
        //no-op
    }

    @Override
    public String getResult() {
        return sb.toString();
    }
}