final String HOST1 = "op1.example.com", HOST2 = "op2.example.com";
Operation op1 = createOperation(HOST1);
Operation op2 = createOperation(HOST2);
SimpleFrameBuilder builder = new SimpleFrameBuilder();
builder.enter(new Operation().type(OperationType.HTTP));
builder.enter(op2);
builder.exit();
builder.enter(new Operation().type(OperationType.METHOD));
builder.enter(op1);
builder.exit();