com.google.caliper.runner.VmDataCollectingVisitor.java Source code

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Here is the source code for com.google.caliper.runner.VmDataCollectingVisitor.java

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/*
 * Copyright (C) 2013 Google 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 com.google.caliper.runner;

import static com.google.common.base.Preconditions.checkState;

import com.google.caliper.bridge.AbstractLogMessageVisitor;
import com.google.caliper.bridge.FailureLogMessage;
import com.google.caliper.bridge.VmOptionLogMessage;
import com.google.caliper.bridge.VmPropertiesLogMessage;
import com.google.caliper.model.VmSpec;
import com.google.common.base.Optional;
import com.google.common.base.Predicate;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.Maps;

/** An {@link AbstractLogMessageVisitor} that collects data about JVM properties and options. */
final class VmDataCollectingVisitor extends AbstractLogMessageVisitor {
    private final ImmutableMap.Builder<String, String> vmOptionsBuilder = ImmutableMap.builder();
    private Optional<ImmutableMap<String, String>> vmProperties = Optional.absent();

    /**
     * Returns a {@link VmSpec} based on the data gathered by this visitor.
     *
     * @throws IllegalStateException if not all the data has been gathered.
     */
    VmSpec vmSpec() {
        ImmutableMap<String, String> options = vmOptionsBuilder.build();
        checkState(!options.isEmpty());
        return new VmSpec.Builder().addAllProperties(vmProperties.get()).addAllOptions(options).build();
    }

    @Override
    public void visit(FailureLogMessage logMessage) {
        throw new ProxyWorkerException(logMessage.stackTrace());
    }

    @Override
    public void visit(VmOptionLogMessage logMessage) {
        vmOptionsBuilder.put(logMessage.name(), logMessage.value());
    }

    static final Predicate<String> PROPERTIES_TO_RETAIN = new Predicate<String>() {
        @Override
        public boolean apply(String input) {
            return input.startsWith("java.vm") || input.startsWith("java.runtime") || input.equals("java.version")
                    || input.equals("java.vendor") || input.equals("sun.reflect.noInflation")
                    || input.equals("sun.reflect.inflationThreshold");
        }
    };

    @Override
    public void visit(VmPropertiesLogMessage logMessage) {
        vmProperties = Optional
                .of(ImmutableMap.copyOf(Maps.filterKeys(logMessage.properties(), PROPERTIES_TO_RETAIN)));
    }
}