com.google.devtools.build.lib.exec.FileWriteStrategy.java Source code

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Here is the source code for com.google.devtools.build.lib.exec.FileWriteStrategy.java

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// Copyright 2014 The Bazel Authors. All rights reserved.
//
// 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.devtools.build.lib.exec;

import com.google.common.collect.Iterables;
import com.google.devtools.build.lib.actions.ActionExecutionContext;
import com.google.devtools.build.lib.actions.EnvironmentalExecException;
import com.google.devtools.build.lib.actions.ExecException;
import com.google.devtools.build.lib.actions.ExecutionStrategy;
import com.google.devtools.build.lib.actions.ResourceSet;
import com.google.devtools.build.lib.analysis.actions.AbstractFileWriteAction;
import com.google.devtools.build.lib.analysis.actions.FileWriteActionContext;
import com.google.devtools.build.lib.profiler.AutoProfiler;
import com.google.devtools.build.lib.vfs.Path;

import java.io.BufferedOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.logging.Logger;

/**
 * A strategy for executing an {@link AbstractFileWriteAction}.
 */
@ExecutionStrategy(name = { "local" }, contextType = FileWriteActionContext.class)
public final class FileWriteStrategy implements FileWriteActionContext {
    private static final Logger LOG = Logger.getLogger(FileWriteStrategy.class.getName());
    public static final Class<FileWriteStrategy> TYPE = FileWriteStrategy.class;

    public FileWriteStrategy() {
    }

    @Override
    public void exec(AbstractFileWriteAction action, ActionExecutionContext actionExecutionContext)
            throws ExecException, InterruptedException {

        try (AutoProfiler p = AutoProfiler.logged("running " + action.prettyPrint(), LOG,
                /*minTimeForLoggingInMilliseconds=*/ 100)) {
            try {
                Path outputPath = Iterables.getOnlyElement(action.getOutputs()).getPath();
                try (OutputStream out = new BufferedOutputStream(outputPath.getOutputStream())) {
                    action.newDeterministicWriter(actionExecutionContext).writeOutputFile(out);
                }
                if (action.makeExecutable()) {
                    outputPath.setExecutable(true);
                }
            } catch (IOException e) {
                throw new EnvironmentalExecException(
                        "failed to create file '" + Iterables.getOnlyElement(action.getOutputs()).prettyPrint()
                                + "' due to I/O error: " + e.getMessage(),
                        e);
            }
        }
    }

    @Override
    public ResourceSet estimateResourceConsumption(AbstractFileWriteAction action) {
        return action.estimateResourceConsumptionLocal();
    }
}