co.cask.cdap.metrics.query.TimeSeriesResponse.java Source code

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Here is the source code for co.cask.cdap.metrics.query.TimeSeriesResponse.java

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/*
 * Copyright  2014 Cask Data, 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 co.cask.cdap.metrics.query;

import com.google.common.collect.ImmutableList;

import java.util.List;

/**
 * Represents timeseries data response to REST calls. Use {@link #builder(long, long)}
 * to construct and GSON to serialize.
 */
final class TimeSeriesResponse {

    private final long start;
    private final long end;
    private final List<TimeValue> data;

    public static Builder builder(final long start, final long end) {
        final ImmutableList.Builder<TimeValue> timeValues = ImmutableList.builder();

        return new Builder() {
            @Override
            public Builder addData(long timestamp, long value) {
                timeValues.add(new TimeValue(timestamp, value));
                return this;
            }

            @Override
            public TimeSeriesResponse build() {
                return new TimeSeriesResponse(start, end, timeValues.build());
            }
        };
    }

    private TimeSeriesResponse(long start, long end, List<TimeValue> data) {
        this.start = start;
        this.end = end;
        this.data = data;
    }

    /**
     * Represents metric data point. Used to construct JSON response.
     */
    static final class TimeValue {
        private final long time;
        private final long value;

        TimeValue(long time, long value) {
            this.time = time;
            this.value = value;
        }
    }

    public interface Builder {
        Builder addData(long timestamp, long value);

        TimeSeriesResponse build();
    }
}