[Build-Flow-Plugin] Parallel & Join operation

[ramesh v r]

Hello All,
 I am trying to use Jenkins build flow plugin to create below build chain.

I have used below DSL to achieve up to build D.
How to specify that Build E should start only after both Build D & Build C are completed?

// Declare all Build Results
def Build_A_Result
def Build_B_Result
def Build_C_Result
def Build_D_Result
def Build_E_Result

// Declare the build calls
def Build_A_Flow= { Build_A_Result= ignore(UNSTABLE) { build( 'Build_A' ) } }
def Build_B_Flow= { Build_B_Result= ignore(UNSTABLE) { build( 'Build_B' ) } }
def Build_C_Flow= { Build_C_Result= ignore(UNSTABLE) { build( 'Build_C' ) } }
def Build_D_Flow= { Build_D_Result= ignore(UNSTABLE) { build( 'Build_D' ) } }
def Build_E_Flow= { Build_E_Result= ignore(UNSTABLE) { build( 'Build_E' ) } }

//Start the process flow
def BuildBDFlow= {
    [   Build_B_Flow,
        Build_D_Flow
    ].each { it() }
}

def BuildABCFlow= {
    [Build_A_Flow,
        { parallel(BuildBDFlow, Build_C_Flow) }
    ].each { it() }
}

[ BuildABCFlow ].each { it() }