Examples of com.thinkaurelius.titan.diskstorage.util.MetricInstrumentedStore

com.thinkaurelius.titan.diskstorage.util.MetricInstrumentedStore

This class instruments an arbitrary KeyColumnValueStore backend with Metrics. The cumulative runtime of, number of invocations of, and number of exceptions thrown by each interface method are instrumented with Metrics (using Timer, Counter, and Counter again, respectively). The Metric names are generated by calling {@link MetricRegistry#name(backendClass,methodName,identifier)}, where methodName is the exact name of the method including capitalization, and identifier is "time", "calls", or "exceptions".

In addition to the three standard metrics, {@code getSlice} and{@code getKeys} have some additional metrics related to their return values.{@code getSlice} carries metrics with the identifiers "entries-returned" and"entries-histogram". The first is a counter of total Entry objects returned. The second is a histogram of the size of Entry lists returned. {@code getKeys} returns a {@link RecordIterator} that manages metrics for itsmethods.

This implementation does not catch any exceptions. Exceptions emitted by the backend store implementation are guaranteed to pass through this implementation's methods.

The implementation includes repeated {@code try...catch} boilerplate thatcould be reduced by using reflection to determine the method name and by delegating Metrics object handling to a common helper that takes a Callable closure, but I'm not sure that the extra complexity and potential performance hit is worth it. @author Dan LaRocque

    public void initialize(Configuration config) {
        try {
            //EdgeStore & VertexIndexStore
            KeyColumnValueStore idStore = getStore(ID_STORE_NAME);
            if (basicMetrics) {
                idStore = new MetricInstrumentedStore(idStore, getMetricsStoreName("idStore"));
            }
            idAuthority = null;
            if (storeFeatures.supportsTransactions()) {
                idAuthority = new TransactionalIDManager(idStore, storeManager, config);
            } else if (storeFeatures.supportsConsistentKeyOperations()) {
                idAuthority = new ConsistentKeyIDManager(idStore, storeManager, config);
            } else {
                throw new IllegalStateException("Store needs to support consistent key or transactional operations for ID manager to guarantee proper id allocations");
            }


            edgeStore = getLockStore(getBufferStore(EDGESTORE_NAME));
            vertexIndexStore = getLockStore(getBufferStore(VERTEXINDEX_STORE_NAME));
            edgeIndexStore = getLockStore(getBufferStore(EDGEINDEX_STORE_NAME), false);




            if (hashPrefixIndex) {
                vertexIndexStore = new HashPrefixKeyColumnValueStore(vertexIndexStore, 4);
                edgeIndexStore = new HashPrefixKeyColumnValueStore(edgeIndexStore, 4);
            }


            if (basicMetrics) {
                edgeStore = new MetricInstrumentedStore(edgeStore, getMetricsStoreName("edgeStore"));
                vertexIndexStore = new MetricInstrumentedStore(vertexIndexStore, getMetricsStoreName("vertexIndexStore"));
                edgeIndexStore = new MetricInstrumentedStore(edgeIndexStore, getMetricsStoreName("edgeIndexStore"));
            }


            String version = null;
            KCVSConfiguration systemConfig = new KCVSConfiguration(storeManager,SYSTEM_PROPERTIES_STORE_NAME,
                                                        SYSTEM_PROPERTIES_IDENTIFIER);

Examples of com.thinkaurelius.titan.diskstorage.util.MetricInstrumentedStore

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