co.cask.cdap.gateway.MockMetricsCollectionService.java Source code

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Here is the source code for co.cask.cdap.gateway.MockMetricsCollectionService.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.gateway;

import co.cask.cdap.common.metrics.MetricsCollectionService;
import co.cask.cdap.common.metrics.MetricsCollector;
import co.cask.cdap.common.metrics.MetricsScope;
import com.google.common.collect.HashBasedTable;
import com.google.common.collect.Table;
import com.google.common.util.concurrent.Futures;
import com.google.common.util.concurrent.ListenableFuture;

import java.util.concurrent.Executor;

/**
 * Metrics collection service for tests.
 */
public class MockMetricsCollectionService implements MetricsCollectionService {
    private final Table<String, String, Integer> metrics = HashBasedTable.create();

    @Override
    public MetricsCollector getCollector(MetricsScope scope, String context, String runId) {
        return new MockMetricsCollector(context);
    }

    @Override
    public ListenableFuture<State> start() {
        return Futures.immediateCheckedFuture(null);
    }

    @Override
    public State startAndWait() {
        return State.RUNNING;
    }

    @Override
    public boolean isRunning() {
        return true;
    }

    @Override
    public State state() {
        return State.RUNNING;
    }

    @Override
    public ListenableFuture<State> stop() {
        return Futures.immediateCheckedFuture(null);
    }

    @Override
    public State stopAndWait() {
        return State.TERMINATED;
    }

    @Override
    public void addListener(Listener listener, Executor executor) {
        // no-op
    }

    public synchronized int getMetrics(String context, String metricName) {
        Integer val = metrics.get(context, metricName);
        return val == null ? 0 : val;
    }

    private class MockMetricsCollector implements MetricsCollector {
        private final String context;

        private MockMetricsCollector(String context) {
            this.context = context;
        }

        @Override
        public void increment(String metricName, int value, String... tags) {
            synchronized (MockMetricsCollectionService.this) {
                Integer v = metrics.get(context, metricName);
                metrics.put(context, metricName, v == null ? value : v + value);
            }
        }
    }
}