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main.go
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main.go
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// Encoding: utf-8
// Cloud Foundry Java Buildpack
// Copyright (c) 2015-2018 the original author or authors.
//
// 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 main
import (
"fmt"
"os"
"github.com/cloudfoundry/java-buildpack-memory-calculator/flags"
"github.com/cloudfoundry/java-buildpack-memory-calculator/memory"
)
const (
exec_name = "java-buildpack-memory-calculator"
)
func main() {
// validateFlags() will exit on error
memSize, numThreads, numLoadedClasses, poolType, rawVmOptions, headRoom := flags.ValidateFlags()
// Reduce total memory to make head room
memSize = memory.MemSize(float64(memSize) * (100-headRoom) / 100)
// default the number of threads if it was not supplied
if numThreads == 0 {
numThreads = 50
}
vmOptions, err := memory.NewVmOptions(rawVmOptions)
if err != nil {
fmt.Fprintf(os.Stderr, "Problem with vmOptions: %s\n", err)
os.Exit(1)
}
allocator, err := memory.NewAllocator(poolType, vmOptions)
if err != nil {
fmt.Fprintf(os.Stderr, "Cannot allocate JVM memory configuration: %s\n", err)
os.Exit(1)
}
if err = allocator.Calculate(numLoadedClasses, numThreads, memSize); err != nil {
fmt.Fprintf(os.Stderr, "Cannot calculate JVM memory configuration: %s\n", err)
os.Exit(1)
}
// Print outputs to standard output for consumption by the caller
fmt.Fprint(os.Stdout, allocator.String())
}