com.facebook.buck.util.FakeProcessExecutor.java Source code

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Here is the source code for com.facebook.buck.util.FakeProcessExecutor.java

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/*
 * Copyright 2012-present Facebook, 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.facebook.buck.util;

import com.google.common.base.Function;
import com.google.common.base.Functions;
import com.google.common.base.Preconditions;
import com.google.common.collect.ImmutableMap;

import java.io.IOException;
import java.io.PrintStream;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;

public class FakeProcessExecutor extends DefaultProcessExecutor {

    private final Function<? super ProcessExecutorParams, FakeProcess> processFunction;
    private final Set<ProcessExecutorParams> launchedProcesses;

    public FakeProcessExecutor() {
        this(ImmutableMap.of());
    }

    public FakeProcessExecutor(Map<ProcessExecutorParams, FakeProcess> processMap) {
        this(processMap, new Console(Verbosity.ALL, System.out, System.err, Ansi.withoutTty()));
    }

    public FakeProcessExecutor(Iterable<Map.Entry<ProcessExecutorParams, FakeProcess>> processIterable) {
        this(processIterable, new Console(Verbosity.ALL, System.out, System.err, Ansi.withoutTty()));
    }

    public FakeProcessExecutor(final Iterable<Map.Entry<ProcessExecutorParams, FakeProcess>> processIterable,
            Console console) {
        this(new Function<ProcessExecutorParams, FakeProcess>() {
            final Iterator<Map.Entry<ProcessExecutorParams, FakeProcess>> processIterator = processIterable
                    .iterator();

            @Override
            public FakeProcess apply(ProcessExecutorParams params) {
                Preconditions.checkState(processIterator.hasNext(),
                        "Ran out of fake processes when asked to run %s", params);
                Map.Entry<ProcessExecutorParams, FakeProcess> nextProcess = processIterator.next();
                Preconditions.checkState(nextProcess.getKey().equals(params),
                        "Mismatch when asked to run process %s (expecting %s)", params, nextProcess.getKey());
                return nextProcess.getValue();
            }
        }, console);
    }

    public FakeProcessExecutor(Map<ProcessExecutorParams, FakeProcess> processMap, Console console) {
        this(Functions.forMap(processMap), console);
    }

    public FakeProcessExecutor(Function<? super ProcessExecutorParams, FakeProcess> processFunction,
            Console console) {
        this(processFunction, console.getStdOut(), console.getStdErr(), console.getAnsi());
    }

    public FakeProcessExecutor(Function<? super ProcessExecutorParams, FakeProcess> processFunction,
            PrintStream stdOutStream, PrintStream stdErrStream, Ansi ansi) {
        super(stdOutStream, stdErrStream, ansi, ProcessHelper.getInstance(), ProcessRegistry.getInstance());
        this.processFunction = processFunction;
        this.launchedProcesses = new HashSet<>();
    }

    @Override
    public LaunchedProcess launchProcess(ProcessExecutorParams params) throws IOException {
        try {
            FakeProcess fakeProcess = processFunction.apply(params);
            launchedProcesses.add(params);
            return new LaunchedProcessImpl(fakeProcess);
        } catch (IllegalArgumentException e) {
            throw new IOException(
                    String.format("FakeProcessExecutor not configured to run process with params %s", params));
        }
    }

    @Override
    public LaunchedProcess launchProcess(ProcessExecutorParams params, ImmutableMap<String, String> context)
            throws IOException {
        return launchProcess(params);
    }

    public boolean isProcessLaunched(ProcessExecutorParams params) {
        return launchedProcesses.contains(params);
    }

    @Override
    public ProcessExecutor cloneWithOutputStreams(PrintStream newStdOutStream, PrintStream newStdErrStream) {
        return new FakeProcessExecutor(processFunction, newStdOutStream, newStdErrStream, Ansi.withoutTty());
    }
}