modules/core/src/main/java/org/apache/ignite/internal/processors/metric/SqlViewMetricExporterSpi.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF 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.
 */

package org.apache.ignite.internal.processors.metric;

import java.util.function.Predicate;
import org.apache.ignite.internal.GridKernalContext;
import org.apache.ignite.internal.IgniteEx;
import org.apache.ignite.internal.systemview.MetricsViewWalker;
import org.apache.ignite.spi.IgniteSpiAdapter;
import org.apache.ignite.spi.IgniteSpiContext;
import org.apache.ignite.spi.IgniteSpiException;
import org.apache.ignite.spi.metric.MetricExporterSpi;
import org.apache.ignite.spi.metric.ReadOnlyMetricManager;
import org.apache.ignite.spi.metric.ReadOnlyMetricRegistry;
import org.apache.ignite.spi.systemview.view.MetricsView;
import org.jetbrains.annotations.Nullable;

/**
 * This SPI implementation exports metrics as SQL views.
 */
class SqlViewMetricExporterSpi extends IgniteSpiAdapter implements MetricExporterSpi {
    /** System view name. */
    public static final String SYS_VIEW_NAME = "metrics";

    /** Metric Registry. */
    private ReadOnlyMetricManager mreg;

    /** {@inheritDoc} */
    @Override protected void onContextInitialized0(IgniteSpiContext spiCtx) throws IgniteSpiException {
        GridKernalContext ctx = ((IgniteEx)ignite()).context();

        ctx.systemView().registerInnerCollectionView(
            SYS_VIEW_NAME,
            "Ignite metrics",
            new MetricsViewWalker(),
            mreg,
            r -> r,
            (r, m) -> new MetricsView(m)
        );

        if (log.isDebugEnabled())
            log.debug(SYS_VIEW_NAME + " SQL view for metrics created.");
    }

    /** {@inheritDoc} */
    @Override public void spiStart(@Nullable String igniteInstanceName) throws IgniteSpiException {
        // No-op.
    }

    /** {@inheritDoc} */
    @Override public void spiStop() throws IgniteSpiException {
        // No-op.
    }

    /** {@inheritDoc} */
    @Override public void setMetricRegistry(ReadOnlyMetricManager mreg) {
        this.mreg = mreg;
    }

    /** {@inheritDoc} */
    @Override public void setExportFilter(Predicate<ReadOnlyMetricRegistry> filter) {
        // No-op.
    }
}